Relevant bibliographies by topics / Laser directed energy deposition

Academic literature on the topic 'Laser directed energy deposition'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Laser directed energy deposition.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Laser directed energy deposition"

1

Lia, Frederick, Joshua Park, Jay Tressler, and Richard Martukanitz. "Partitioning of laser energy during directed energy deposition." Additive Manufacturing 18 (December 2017): 31–39. http://dx.doi.org/10.1016/j.addma.2017.08.012.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Hauser, Tobias, Raven T. Reisch, Tobias Kamps, Alexander F. H. Kaplan, and Joerg Volpp. "Acoustic emissions in directed energy deposition processes." International Journal of Advanced Manufacturing Technology 119, no. 5-6 (January 7, 2022): 3517–32. http://dx.doi.org/10.1007/s00170-021-08598-8.

Full text
Abstract:
AbstractAcoustic emissions in directed energy deposition processes such as wire arc additive manufacturing and directed energy deposition with laser beam/metal are investigated within this work, as many insights about the process can be gained from this. In both processes, experienced operators can hear whether a process is running stable or not. Therefore, different experiments for stable and unstable processes with common process anomalies were carried out, and the acoustic emissions as well as process camera images were captured. Thereby, it was found that stable processes show a consistent mean intensity in the acoustic emissions for both processes. For wire arc additive manufacturing, it was found that by the Mel spectrum, a specific spectrum adapted to human hearing, the occurrence of different process anomalies can be detected. The main acoustic source in wire arc additive manufacturing is the plasma expansion of the arc. The acoustic emissions and the occurring process anomalies are mainly correlating with the size of the arc because that is essentially the ionized volume leading to the air pressure which causes the acoustic emissions. For directed energy deposition with laser beam/metal, it was found that by the Mel spectrum, the occurrence of an unstable process can also be detected. The main acoustic emissions are created by the interaction between the powder and the laser beam because the powder particles create an air pressure through the expansion of the particles from the solid state to the liquid state when these particles are melted. These findings can be used to achieve an in situ quality assurance by an in-process analysis of the acoustic emissions.
APA, Harvard, Vancouver, ISO, and other styles
3

Jardon, Zoé, Julien Ertveldt, Raphaël Lecluyse, Michaël Hinderdael, and Lincy Pyl. "Directed Energy Deposition roughness mitigation through laser remelting." Procedia CIRP 111 (2022): 180–84. http://dx.doi.org/10.1016/j.procir.2022.08.042.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Chen, Yitao, Xinchang Zhang, Mohammad Masud Parvez, and Frank Liou. "A Review on Metallic Alloys Fabrication Using Elemental Powder Blends by Laser Powder Directed Energy Deposition Process." Materials 13, no. 16 (August 12, 2020): 3562. http://dx.doi.org/10.3390/ma13163562.

Full text
Abstract:
The laser powder directed energy deposition process is a metal additive manufacturing technique, which can fabricate metal parts with high geometric and material flexibility. The unique feature of in-situ powder feeding makes it possible to customize the elemental composition using elemental powder mixture during the fabrication process. Thus, it can be potentially applied to synthesize industrial alloys with low cost, modify alloys with different powder mixtures, and design novel alloys with location-dependent properties using elemental powder blends as feedstocks. This paper provides an overview of using a laser powder directed energy deposition method to fabricate various types of alloys by feeding elemental powder blends. At first, the advantage of laser powder directed energy deposition in manufacturing metal alloys is described in detail. Then, the state-of-the-art research and development in alloys fabricated by laser powder directed energy deposition through a mix of elemental powders in multiple categories is reviewed. Finally, critical technical challenges, mainly in composition control are discussed for future development.
APA, Harvard, Vancouver, ISO, and other styles
5

Wang, Hao, Weiwei Liu, Zijue Tang, Yiwen Wang, Xiaolei Mei, Kazi M. Saleheen, Zhenqiu Wang, and Hongchao Zhang. "Review on adaptive control of laser-directed energy deposition." Optical Engineering 59, no. 07 (July 6, 2020): 1. http://dx.doi.org/10.1117/1.oe.59.7.070901.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Ascari, Alessandro, Adrian H. A. Lutey, Erica Liverani, and Alessandro Fortunato. "Laser Directed Energy Deposition of Bulk 316L Stainless Steel." Lasers in Manufacturing and Materials Processing 7, no. 4 (September 12, 2020): 426–48. http://dx.doi.org/10.1007/s40516-020-00128-w.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Liu, Xiao, Haoren Wang, Kevin Kaufmann, and Kenneth Vecchio. "Directed energy deposition of pure copper using blue laser." Journal of Manufacturing Processes 85 (January 2023): 314–22. http://dx.doi.org/10.1016/j.jmapro.2022.11.064.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Wang, Qian, Jianyi Li, Abdalla R. Nassar, Edward W. Reutzel, and Wesley F. Mitchell. "Model-Based Feedforward Control of Part Height in Directed Energy Deposition." Materials 14, no. 2 (January 11, 2021): 337. http://dx.doi.org/10.3390/ma14020337.

Full text
Abstract:
Control of the geometric accuracy of a metal deposit is critical in the repair and fabrication of complex components through Directed Energy Deposition (DED). This paper developed and experimentally evaluated a model-based feedforward control of laser power with the objective of achieving the targeted part height in DED. Specifically, based on the dynamic model of melt-pool geometry derived from our prior work, a nonlinear inverse-dynamics controller was derived in a hatch-by-hatch, layer-by-layer manner to modulate the laser power such that the melt-pool height was regulated during the simulated build process. Then, the laser power trajectory from the simulated closed-loop control under the nonlinear inverse-dynamics controller was implemented as a feedforward control in an Optomec Laser-Engineered Net Shape (LENS) MR-7 system. This paper considered the deposition of L-shaped structures of Ti-6AL-4V as a case study to illustrate the proposed model-based controller. Experimental validation showed that by applying the proposed model-based feed-forward control for laser power, the resulting build had 24–42% reduction in the average build height error with respect to the target build height compared to applying a constant laser power through the entire build or applying a hatch-dependent laser power strategy, for which the laser power values were obtained from experimental trial and error.
APA, Harvard, Vancouver, ISO, and other styles
9

Wang, Qian, Jianyi Li, Abdalla R. Nassar, Edward W. Reutzel, and Wesley F. Mitchell. "Model-Based Feedforward Control of Part Height in Directed Energy Deposition." Materials 14, no. 2 (January 11, 2021): 337. http://dx.doi.org/10.3390/ma14020337.

Full text
Abstract:
Control of the geometric accuracy of a metal deposit is critical in the repair and fabrication of complex components through Directed Energy Deposition (DED). This paper developed and experimentally evaluated a model-based feedforward control of laser power with the objective of achieving the targeted part height in DED. Specifically, based on the dynamic model of melt-pool geometry derived from our prior work, a nonlinear inverse-dynamics controller was derived in a hatch-by-hatch, layer-by-layer manner to modulate the laser power such that the melt-pool height was regulated during the simulated build process. Then, the laser power trajectory from the simulated closed-loop control under the nonlinear inverse-dynamics controller was implemented as a feedforward control in an Optomec Laser-Engineered Net Shape (LENS) MR-7 system. This paper considered the deposition of L-shaped structures of Ti-6AL-4V as a case study to illustrate the proposed model-based controller. Experimental validation showed that by applying the proposed model-based feed-forward control for laser power, the resulting build had 24–42% reduction in the average build height error with respect to the target build height compared to applying a constant laser power through the entire build or applying a hatch-dependent laser power strategy, for which the laser power values were obtained from experimental trial and error.
APA, Harvard, Vancouver, ISO, and other styles
10

Kim, Kang-Hyung, Chan-Hyun Jung, Dae-Yong Jeong, and Soong-Keun Hyun. "Causes and Measures of Fume in Directed Energy Deposition: A Review." Korean Journal of Metals and Materials 58, no. 6 (June 5, 2020): 383–96. http://dx.doi.org/10.3365/kjmm.2020.58.6.383.

Full text
Abstract:
Pores and cracks are known as the main defects in metal additive manufacturing (MAM), including directed energy deposition(DED). A gaseous fume is often produced by laser flash (instantaneous high temperature) during laser processing, which may cause various defects such as porosity, lack of fusion, inhomogeneity, low flowability and composition change, either. However the cause and harmful effects of fume generation in DED are known little. In laser processing, especially laser welding, many studies have been conducted on the prevention of fume because it generates defects that hinder uniform reactions between the laser beam and the materials. Generally, the fume occurs with easily vaporizing low melting point components or sensitive oxidizing elements. Unsuitable conditions are also known to have an effect, including laser power, travel speed, powder feed rate and shielding gas supply. Practically, there are many more fume generating factors in the DED process, and the lack of understanding requires a lot of trial and error. In this article the laser-related and weld metallurgy literatures were reviewed, focusing on the prevention of fume in powder DED. The causes of the fume, were explained to result from the stages of cavitation bubbles generated by the laser induced plasma and the nanoparticles released. Additionally, the effects of alloying components and environmental conditions for fume generation in the DED process were investigated, and suggestions are proposed to prevent fume.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Laser directed energy deposition"

1

Sreekanth, Suhas. "Laser-Directed Energy Deposition : Influence of Process Parameters and Heat-Treatments." Licentiate thesis, Högskolan Väst, Avdelningen för svetsteknologi (SV), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-15767.

Full text
Abstract:
Laser-Directed Energy Deposition (L-DED), an Additive Manufacturing (AM) processused for the fabrication of parts in a layer-wise approach has displayed an immense potential over the last decade. The aerospace industry stands as the primary beneficiary due to the L-DED process capability to build near-net-shape components with minimal tooling and thereby producing minimum wastage because of reduced machining. The widespread use of Alloy 718 in the aero-engine application has prompted huge research interest in the development of L-DED processing of this superalloy. AM processes are hindered by low build rates and high cycle times which directly affects the process costs. To overcome these issues, the present work focusses on obtaining high deposition rates through a high material feed. Studying the influence of process parameters during the L-DED process is of prime importance as they determine the performance of in-service structures. In the present work, process parameters such as laser power, scanning speed, feed rate and stand-offdistances are varied and their influence on geometry and microstructure of Alloy 718 single-track deposits are analyzed. The geometry of deposits is measured in terms of height, width and depth; and the powder capture efficiency is determined by measuring areas of deposition and dilution. The microstructure of the deposits shows a column ardendritic structure in the middle and bottom region of the deposits and equiaxed grains in the top region. Nb-rich segregation involving laves and NbC phases, typical of Alloy718 is found in the interdendritic regions and grain boundaries. The segregation increases along the height of the deposit with the bottom region having the least and the top region showing the highest concentration of Nb-rich phases due to the variation in cooling rates. A high laser power (1600 W – 2000 W) and a high scanning speed (1100 mm/min) are found to be the preferable processing conditions for minimizing segregation. Another approach to minimize segregation is by performing post-build heat treatments. The solution treatment (954 °C/1 hr) and double aging (718 °C/8 hr + 621 °C/ 8 hr) standardized for the wrought form of Alloy 718 is applied to as-built deposits which showed a reduction in segregation due to the dissolution of Nb-rich phases. Upon solution treatment, this reduction is accompanied by precipitation of the delta phase, found predominantly in top and bottom regions and sparsely in the middle region of the deposit.
APA, Harvard, Vancouver, ISO, and other styles
2

Crisanti, Roberto. "Laser Direct Energy Deposition per la manifattura additiva: caratterizzazione del processo e prove sperimentali." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

Find full text
Abstract:
Studio condotto presso il Dipartimento di Ingegneria Industriale dell’Università di Bologna su un processo di Laser Direct Energy Deposition, o Laser Cladding, e sulla sua caratterizzazione, avente come fine ultimo quello di realizzare pezzi massicci a base rettangolare dotati di una morfologia esterna regolare e al contempo privi di difetti macroscopici all’interno, quali porosità o zone con mancata fusione del materiale d’apporto. Nella prima parte dello studio sono stati presi in esame i principali parametri di processo, ovvero la potenza della sorgente laser e la portata di polvere, e l’influenza che essi hanno sulle caratteristiche geometriche del deposito (profondità di penetrazione, altezza, larghezza, grado di diluizione, area del deposito e del rinforzo, ampiezza media della ZTA, percentuale di porosità). Tale studio si è basato sull’osservazione ed analisi al microscopio di singoli cordoni di deposizione, realizzati variando la portata di polvere la potenza del laser, a parità di velocità di avanzamento. La seconda parte si basa sull’analisi dei risultati delle prove condotte con lo scopo di realizzare dei campioni massicci a base rettangolare: si sono studiati gli effetti che variazioni dei parametri di processo e della strategia di scansione hanno avuto sulla morfologia finale dei pezzi e sulle loro caratteristiche interne (porosità, zone con mancata fusione). Si sono confrontate due strategie di deposizione, la strategia con ritorno della testa a laser spento (laser OFF) e la strategia con ritorno della testa a laser acceso (laser ON). Tale studio ha permesso di concludere che la strategia con ritorno laser ON risulta essere preferibile in quanto non solo consente di ottenere un risparmio in termini energetici, di tempo e di quantità di polvere utilizzata, ma anche di realizzare dei pezzi massicci che rappresentano il miglior compromesso ottenuto tra una morfologia esterna uniforme e delle buone caratteristiche interne, con una densità prossima al 100%.
APA, Harvard, Vancouver, ISO, and other styles
3

Juhasz, Michael J. "In and Ex-Situ Process Development in Laser-Based Additive Manufacturing." Youngstown State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ysu15870552278358.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Lindell, David. "Process Mapping for Laser Metal Deposition of Wire using Thermal Simulations : A prediction of material transfer stability." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-85474.

Full text
Abstract:
Additive manufacturing (AM) is a quickly rising method of manufacturing due to its ability to increase design freedom. This allows the manufacturing of components not possible by traditional subtractive manufacturing. AM can greatly reduce lead time and material waste, therefore decreasing the cost and environmental impact. The adoption of AM in the aerospace industry requires strict control and predictability of the material deposition to ensure safe flights.  The method of AM for this thesis is Laser Metal Deposition with wire (LMD-w). Using wire as a feedstock introduces a potential problem, the material transfer from the wire to the substrate. This requires all process parameters to be in balance to produce a stable deposition. The first sign of unbalanced process parameters are the material transfer stabilities; stubbing and dripping. Stubbing occurs when the energy to melt the wire is too low and the wire melts slower than required. Dripping occurs when too much energy is applied and the wire melts earlier than required.  These two reduce the predictability and stability that is required for robust manufacturing.  Therefore, the use of thermal simulations to predict the material transfer stability for LMD-w using Waspaloy as the deposition material has been studied.  It has been shown that it is possible to predict the material transfer stability using thermal simulations and criterions based on preexisting experimental data. The criterion for stubbing checks if the completed simulation result produces a wire that ends below the melt pool. For dripping two criterions shows good results, the dilution ratio is a good predictor if the tool elevation remains constant. If there is a change in tool elevation the dimensionless slenderness number is a better predictor.  Using these predictive criterions it is possible to qualitatively map the process window and better understand the influence of tool elevation and the cross-section of the deposited material.
Additiv tillverkning (AT) är en kraftigt växande tillverkningsmetod på grund av sin flexibilitet kring design och möjligheten att skapa komponenter som inte är tillverkningsbara med traditionell avverkande bearbetning.  AT kan kraftigt minska tid- och materialåtgång och på så sett minskas kostnader och miljöpåverkan. Införandet av AT i flyg- och rymdindustrin kräver strikt kontroll och förutsägbarhet av processen för att försäkra sig om säkra flygningar.  Lasermetalldeponering av tråd är den AT metod som hanteras i denna uppsats. Användandet av tråd som tillsatsmaterial skapar ett potentiellt problem, materialöverföringen från tråden till substratet. Detta kräver att alla processparametrar är i balans för att få en jämn materialöverföring. Är processen inte balanserad syns detta genom materialöverföringsstabiliteterna stubbning och droppning. Stubbning uppkommer då energin som tillförs på tråden är för låg och droppning uppkommer då energin som tillförs är för hög jämfört med vad som krävs för en stabil process. Dessa två fenomen minskar möjligheterna för en kontrollerbar och stabil tillverkning.  På grund av detta har användandet utav termiska simuleringar för att prediktera materialöverföringsstabiliteten för lasermetalldeponering av tråd med Waspaloy som deponeringsmaterial undersökts. Det har visat sig vara möjligt att prediktera materialöverföringsstabiliteten med användning av termiska simuleringar och kriterier baserat på tidigare experimentell data. Kriteriet för stubbning kontrolleras om en slutförd simulering resulterar i en tråd som når under smältan.  För droppning finns två fungerande kriterier, förhållandet mellan svetshöjd och penetrationsdjup om verktygshöjden är konstant, sker förändringar i verktygshöjden är det dimensionslös ”slenderness” talet ett bättre kriterium.  Genom att använda dessa kriterier är det möjligt att kvalitativt kartlägga processfönstret och skapa en bättre förståelse för förhållandet mellan verktygshöjden och den deponerade tvärsnittsarean.
APA, Harvard, Vancouver, ISO, and other styles
5

Kumara, Chamara. "Microstructure Modelling of Additive Manufacturing of Alloy 718." Licentiate thesis, Högskolan Väst, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-13197.

Full text
Abstract:
In recent years, additive manufacturing (AM) of Alloy 718 has received increasing interest in the field of manufacturing engineering owing to its attractive features compared to those of conventional manufacturing methods. The ability to produce complicated geometries, low cost of retooling, and control of the microstructure are some of the advantages of the AM process over traditional manufacturing methods. Nevertheless, during the building process, the build material undergoes complex thermal conditions owing to the inherent nature of the process. This results in phase transformation from liquid to solid and solid state. Thus, it creates microstructural gradients in the built objects, and as a result,heterogeneous material properties. The manufacturing process, including the following heat treatment that is used to minimise the heterogeneity, will cause the additively manufactured material to behave differently when compared to components produced by conventional manufacturing methods. Therefore, understanding the microstructure formation during the building and subsequent post-heat treatment is important, which is the objective of this work. Alloy 718 is a nickel-iron based super alloy that is widely used in the aerospace industry and in the gas turbine power plants for making components subjected tohigh temperatures. Good weldability, good mechanical properties at high temperatures, and high corrosion resistance make this alloy particularly suitablefor these applications. Nevertheless, the manufacturing of Alloy 718 components through traditional manufacturing methods is time-consuming and expensive. For example, machining of Alloy 718 to obtain the desired shape is difficult and resource-consuming, owing to significant material waste. Therefore, the application of novel non-conventional processing methods, such as AM, seems to be a promising technique for manufacturing near-net-shape complex components.In this work, microstructure modelling was carried out by using multiphase-field modelling to model the microstructure evolution in electron beam melting (EBM) and laser metal powder directed energy deposition (LMPDED) of Alloy 718 and x subsequent heat treatments. The thermal conditions that are generated during the building process were used as input to the models to predict the as-built microstructure. This as-built microstructure was then used as an input for the heat treatment simulations to predict the microstructural evolution during heat treatments. The results showed smaller dendrite arm spacing (one order of magnitude smaller than the casting material) in these additive manufactured microstructures, which creates a shorter diffusion length for the elements compared to the cast material. In EBM Alloy 718, this caused the material to have a faster homogenisation during in-situ heat treatment that resulting from the elevated powder bed temperature (> 1000 °C). In addition, the compositional segregation that occurs during solidification was shown to alter the local thermodynamic and kinetic properties of the alloy. This was observed in the predicted TTT and CCT diagrams using the JMat Pro software based on the predicted local segregated compositions from the multiphase-field models. In the LMPDED Alloy 718 samples, this resulted in the formation of δ phase in the interdendritic region during the solution heat treatment. Moreover, this resulted in different-size precipitation of γ'/γ'' in the inter-dendritic region and in the dendrite core. Themicro structure modelling predictions agreed well with the experimental observations. The proposed methodology used in this thesis work can be an appropriate tool to understand how the thermal conditions in AM affect themicro structure formation during the building process and how these as-built microstructures behave under different heat treatments.
APA, Harvard, Vancouver, ISO, and other styles
6

Pinchuk, A., and K. Jiang. "Laser-Directed Deposition of Mannan-Functionalized Silver Nanostructures." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42504.

Full text
Abstract:
Mannan is a polymannose isolated from the cell wall of Saccaromyces cerevisiae and has strong binding affinity to mannose receptors on antigen presenting cells (APCs), such as dendritic cells and macrophages. Mannan-functionalized nanomaterials or nanostructures are thus of high interests in studying immune responses towards fungi. In this work, we investigated the fabrication of mannan-coated silver nanostructures using a laser-deposition technique. Specifically, two different starting materials were applied for laser-deposition. One is a mixture solution of AgNO3 and mannan, and the other one is the suspension of silver nanoparticles synthesized with mannan as the sole reducing and capping agent. Using 405 nm diode laser in a confocal microscope, we successfully fabricated mannan-covered micropatterns by laser-induced photoreduction of silver ions or aggregation of mannan-capped AgNPs. The results show that both starting materials can be applied to deposit micro- or nanoscaled structures that are covered with mannan, which was confirmed by fluorescence microscopy. These silver nanostructure-supported mannan patterns are promising candidates to mimic the fungal membrane and beneficial for immune cell studies.
APA, Harvard, Vancouver, ISO, and other styles
7

McGinnis, Roger D. "Free Electron Laser development for directed energy." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA387898.

Full text
Abstract:
Dissertation (Ph.D. in Physics) Naval Postgraduate School, Dec. 2000.
Dissertation advisor, Colson, William B. "December 2000." Includes bibliographical references (p. 131-133). Also available in print.
APA, Harvard, Vancouver, ISO, and other styles
8

Waller, Gordon Henry. "Template Directed Growth of Nb doped SrTiO3 using Pulsed Laser Deposition." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/32723.

Full text
Abstract:
Oxide materials display a wide range of physical properties. Recently, doped complex oxides have drawn considerable attention for various applications including thermoelectrics. Doped complex oxide materials have high Seebeck coefficients (S) and electrical conductivities (o) comparable to other doped semiconductors but low thermoelectric figure of merit ZT values due to their poor thermal conductivities. For example, niobium doped strontium titanate (SrNbxTi1-xO3 or simply Nb:STO) has a power factor comparable to that of bismuth telluride. Semiconductor nanostructures have demonstrated a decrease in thermal conductivity () resulting in an increase in the thermoelectric figure of merit (ZT). Nanostructures of doped oxides like niobium doped strontium titanate, may also lead to decreased and a corresponding increase in ZT. The major impediment to nanostructured oxide thermoelectric materials is the lack of suitable fabrication techniques for testing and eventual use. Electron Beam Lithography(EBL) was used to pattern poly-methyl-methacrylate (PMMA) resists on undoped single crystalline SrTiO3 (STO) substrates which were then filled with Nb:STO using Pulsed Laser Deposition (PLD) at room temperature. This technique produced nanowires and nanodots with critical dimensions below 100 nm, and a yield of approximately 95%. In addition to scanning electron microscopy and atomic force microscopy morphological studies of the patterned oxide, thin film analogues were used to study composition, crystallinity and electrical conductivity of the material in response to a post deposition heat treatment. Since the thin films were grown under similar experimental parameters as the oxide nanostructres, the patterned oxides are believed to be stoichiometric and highly crystalline. The study found that using a combination of EBL and PLD, it is possible to produce highly crystalline, doped complex oxide nanostructures with excellent control over morphology. Furthermore, the technique is applicable to nearly all materials and provides the capability of patterning doped oxide materials without the requirement of etching or multiple lithography steps makes this approach especially interesting for future fundamental materials research and novel device fabrication.
Master of Science
APA, Harvard, Vancouver, ISO, and other styles
9

Williams, Robert E. "Naval electric weapons : the electromagnetic railgun and free electron laser /." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FWilliams.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Kundrapu, Madhusudhan, Michael Keidar, and Charles Jones. "Electrostatic Approach for Mitigation of Communication Attenuation During Directed Energy Testing." International Foundation for Telemetering, 2009. http://hdl.handle.net/10150/606128.

Full text
Abstract:
ITC/USA 2009 Conference Proceedings / The Forty-Fifth Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2009 / Riviera Hotel & Convention Center, Las Vegas, Nevada
Electrostatic approach is considered for mitigation of communication attenuation during the testing of laser powered directed energy weapon. Mitigation analysis is carried out for two target materials Al and Ti. Plasma parameters are obtained using one dimensional coupled analysis of laser-target interaction. Influence of laser beam frequency on plasma parameters is addressed. Sheath thickness is obtained using transient sheath calculations. It is found that uninterrupted telemetry can be achieved | using a maximum bias voltage of 10 kV, through Al plasma for fluences below 5 J/cm² and through Ti plasma for fluences below 2 J/cm².
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Laser directed energy deposition"

1

Insight, LLC Medtech. U.S. markets for directed energy surgical systems, 2001-2010. Tustin, CA: Medtech Insight, 2002.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Free Electron Laser Development for Directed Energy. Storming Media, 2000.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Department of Defense. Navy Additive Manufacturing: Adding Parts, Subtracting Steps - 3D Printing, Tooling, Aerospace, Binder Jetting, Directed Energy Deposition, Material Extrusion, Powder Fusion, Photopolymerization. Independently Published, 2017.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Department of Defense. Navy Shipboard Lasers for Surface, Air, and Missile Defense: Deployment of the First Solid-State Laser Directed Energy Weapon, Terminal Defense Against China's ASBM. Independently Published, 2017.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Department of Defense. Hypersonic Threats to the Homeland - Strategic Options: Imperative to Develop Directed Energy and Laser Weapons with Increased Stand-Off Capabilities to Guard Against Russian and Chinese Weapons. Independently Published, 2019.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

McGlynn, E., M. O. Henry, and J. P. Mosnier. ZnO wide-bandgap semiconductor nanostructures: Growth, characterization and applications. Edited by A. V. Narlikar and Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533053.013.14.

Full text
Abstract:
This article describes the growth, characterization and applications of zinc oxide (ZnO) wide-bandgap semiconductor nanostructures. It first introduces the reader to the basic physics and materials science of ZnO, with particular emphasis on the crystalline structure, electronic structure, optical properties and materials properties of ZnO wide-bandgap semiconductors. It then considers some of the commonly used growth methods for ZnO nanostructures, including vapor-phase transport, chemical vapor deposition, molecular beam epitaxy, pulsed-laser deposition, sputtering and chemical solution methods. It also presents the results of characterization of ZnO nanostructures before concluding with a discussion of some promising areas of application of ZnO nanostructures, such as field emission applications; electrical, optical/photonic applications; and applications in sensing, energy production, photochemistry, biology and engineering.
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Laser directed energy deposition"

1

Mandolini, Marco, Mikhailo Sartini, Claudio Favi, and Michele Germani. "An Analytical Cost Model for Laser-Directed Energy Deposition (L-DED)." In Advances on Mechanics, Design Engineering and Manufacturing IV, 993–1004. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-15928-2_87.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Iqbal, Muhammad, Asif Iqbal, Malik M. Nauman, Quentin Cheok, and Emeroylariffion Abas. "Manufacturing, Remanufacturing, and Surface Repairing of Various Machine Tool Components Using Laser-Assisted Directed Energy Deposition." In Functional Reverse Engineering of Machine Tools, 79–88. Boca Raton, FL : CRC Press/Taylor & Francis Group, 2019. | Series: Computers in engineering design and manufacturing: CRC Press, 2019. http://dx.doi.org/10.1201/9780429022876-7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Diljith, P. K., A. N. Jinoop, C. P. Paul, P. Krishna, S. Bontha, and K. S. Bindra. "Elucidating Corrosion Behavior of Hastelloy-X Built Using Laser Directed Energy Deposition-Based Additive Manufacturing in Acidic Environments." In Advances in Materials and Mechanical Engineering, 347–55. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0673-1_28.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Baraldo, Stefano, Ambra Vandone, Anna Valente, and Emanuele Carpanzano. "Closed-Loop Control by Laser Power Modulation in Direct Energy Deposition Additive Manufacturing." In Lecture Notes in Mechanical Engineering, 129–43. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-46212-3_9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Jardon, Zoé, Julien Ertveldt, and Patrick Guillaume. "Effect of Coaxial Powder Nozzle Jet Process Parameters on Single-Track Geometry for Laser Beam Directed Energy Deposition Process." In Progress in additive manufacturing 2020, 51–74. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2022. http://dx.doi.org/10.1520/stp163720200108.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Gibson, Ian, David Rosen, Brent Stucker, and Mahyar Khorasani. "Directed Energy Deposition." In Additive Manufacturing Technologies, 285–318. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-56127-7_10.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Li, Kun, Jianbin Zhan, Peng Jin, Qian Tang, David Z. Zhang, Wei Xiong, and Huajun Cao. "Functionally Graded Alloys from 316 Stainless Steel to Inconel 718 by Powder-Based Laser Direct Energy Deposition." In The Minerals, Metals & Materials Series, 304–12. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92381-5_28.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Zohuri, Bahman. "Laser Technology." In Directed Energy Weapons, 27–33. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31289-7_2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Zohuri, Bahman. "Laser Safety." In Directed Energy Weapons, 35–46. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31289-7_3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Zohuri, Bahman. "Laser Weapons." In Directed Energy Weapons, 47–77. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31289-7_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Laser directed energy deposition"

1

Yadav, Sunil, Christ P. Paul, Arackal N. Jinoop, Saurav K. Nayak, Arun K. Rai, and Kushvinder S. Bindra. "Effect of Process Parameters on Laser Directed Energy Deposition of Copper." In ASME 2019 Gas Turbine India Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gtindia2019-2453.

Full text
Abstract:
Abstract Laser Additive Manufacturing (LAM) is an advanced manufacturing processes for fabricating engineering components directly from CAD Model by depositing material in a layer by layer fashion using lasers. LAM is being widely deployed in various sectors such as power, aerospace, automotive etc. for fabricating complex shaped and customized components. One of the most commonly used LAM process is Directed Energy Deposition (LAM-DED) which is used for manufacturing near net shaped components with tailored microstructure, multi-materials (direct and graded) and complex geometry. This paper reports experimental investigation of LAM of Copper (Cu) tracks on Stainless Steel 304 L (SS 304L) using an indigenously developed LAM-DED system. Cu-SS304L joints find wider applications in tooling, automotive and aerospace sectors due to its combination of higher strength, thermal conductivity and corrosion resistance. However, laying Cu layers on SS304L is not trivial due to large difference in the thermo-physical properties. Thus, a comprehensive experiments using full factorial design are carried out and a number of Cu tracks were laid on SS304L substrate by varying laser power, scan speed and powder feed rate. The laid tracks are characterized for track geometry and porosity and the quality of the tracks are analyzed. Lower values of laser power and higher powder feed rate results in discontinuous deposition, while higher laser power and lower powder feed rate results in cracked deposits. Porosity is observed to vary from 6–45 % at different process conditions. Analysis of Variance (ANOVA) of deposition rate and track geometry is performed to estimate the major contributing process parameters. This study paves a way to understand effect of process parameters on LAM-DED for fabricating bimetallic joints and graded structures of Copper and SS304L.
APA, Harvard, Vancouver, ISO, and other styles
2

Li, Jianyi, Qian Wang, and Panagiotis (Pan) Michaleris. "Towards Computational Modeling of Temperature Field Evolution in Directed Energy Deposition Processes." In ASME 2018 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/dscc2018-8973.

Full text
Abstract:
In modeling and simulating thermo-mechanical behavior in a directed energy deposition process, it often needs to compute the temperature field evolved in the deposition process since thermal history in the deposition process would affect part geometry as well as microstructure, material properties, residual stress, and distortion of the final part. This paper presents an analytical computation of temperature field evolved in a directed energy deposition process, using a single-bead wall as an illustrating example. Essentially, the temperature field is computed by superposition of the temperature fields generated by the laser source as well as induced from each of the past beads, where the transient solution to a moving heat source in a semi-infinite body is applied to describe each individual temperature field. For better characterization of cooling effect (temperature contribution from a past bead), a pair of positive and negative virtual heat sources is assigned for each past bead. In addition, mirrored heat sources through a reflexion technique are introduced to define the adiabatic boundaries of the part being built and to account for the substrate thickness. In the end, three depositions of Ti-6AL-4V walls with different geometries and inter-layer dwell times on an Optomec® laser engineered net shaping (LENS) system are used to validate the proposed analytical computation, where predicted temperatures at several locations of the depositions show reasonable agreement with the in situ temperature measurements, with the average prediction error less than 15%. The proposed analytical computation for temperature field in directed energy deposition could be potentially used in model-based feedback control for thermal history in the deposition, which could affect microstructure evolution and other properties of the final part.
APA, Harvard, Vancouver, ISO, and other styles
3

Rahman, M. M., G. Huanes-Alvan, H. Sahasrabudhe, and S. K. Chakrapani. "Elastic Properties of IN718 Fabricated via Laser Directed Energy Deposition (DED)." In 2021 48th Annual Review of Progress in Quantitative Nondestructive Evaluation. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/qnde2021-74848.

Full text
Abstract:
Abstract Additive manufacturing of nickel based super alloys such as IN718 is highly desirable since they have a wide range of applications in high performance structures. Compared to conventional methods, laser processing allows for near net shaping of complex geometries. However, laser processing can result in very complex microstructures including meta-stable phases, grain boundary segregation of precipitates, dendritic grains and cellular microstructure. Describing elastic properties of such structures can be quite challenging due to these features. This article explores the use of resonant ultrasound spectroscopy (RUS) to characterize the elastic properties of IN718 samples fabricated using Laser Directed Energy Deposition (DED). For initial estimates of the elastic constants, ultrasonic wave (longitudinal and shear) velocities measured at 5MHz and 2.25 MHz respectively. The initial assumption was that the eventual structure will be orthotropic and the 9 elastic constants were determined using a combination of RUS and propagating wave experiments. A finite element approach was adopted to model this system and to minimize the values of elastic constants. The results seem to suggest that the secondary phases such as Laves will influence the eventual anisotropy of the bulk structure.
APA, Harvard, Vancouver, ISO, and other styles
4

Ishiyama, Keiya, Ryo Koike, Yasuhiro Kakinuma, Tetsuya Suzuki, and Takanori Mori. "Cooling Process for Directional Solidification in Directed Energy Deposition." In ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6437.

Full text
Abstract:
Additive manufacturing (AM) for metals has attracted attention from industry because of its great potential to enhance production efficiency and reduce production costs. Directed energy deposition (DED) is a metal AM process suitable to produce large-scale freeform metal products. DED entails irradiating the baseplate with a laser beam and launching the metal powder onto the molten spot to produce a metal part on the baseplate. Because the process enables powder from different materials to be used, DED is widely applicable to valuable production work such as for a dissimilar material joint, a graded material, or a part with a special structure. With regard to parts with a special structure, directional solidification can prospectively be used in the power plant and aerospace industries because it can enhance the stiffness in a specific direction via only a simple process. However, conventional approaches for directional solidification require a special mold in order to realize a long-lasting thermal gradient in the part. On the other hand, from the viewpoint of thermal distribution in a produced part, DED is able to control the gradient by controlling the position of the molten pool, i.e., the position of the laser spot. Moreover, unlike casting, the thermal gradient can be precisely oriented in the expected direction, because the laser supplies heat energy on the regulated spot. In this study, the applicability of DED to directional solidification in Inconel® 625 is theoretically and experimentally evaluated through metal structure observation and Vickers hardness measurements. Furthermore, the effect of two different cooling processes on directional solidification is also considered with the aim of improving the mechanical stiffness of a part produced by DED. The observations and experimental results show that both the cooling methods (baseplate cooling and intermittent treatment with coolant) are able to enhance the hardness while retaining the anisotropy.
APA, Harvard, Vancouver, ISO, and other styles
5

Liu, Peipei, Kiyoon Yi, and Hoon Sohn. "Porosity Inspection in Metal Directed Energy Deposition Using Femtosecond Laser Based Transient Thermoreflectance Measurement." In 2021 48th Annual Review of Progress in Quantitative Nondestructive Evaluation. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/qnde2021-68491.

Full text
Abstract:
Abstract In metal directed energy deposition (DED), defects such as porosity, lack-of-fusion and cracking often occur during its material melting-solidification process. In this research, a femtosecond laser based transient thermoreflectance (TTR) technique was developed for porosity inspection in metal DED. The major contributions of the proposed technique include the following: (1) A femtosecond laser based TTR measurement system is developed for fully noncontact measurement of thermoreflectance from a newly deposited layer in DED. (2) Porosity is inspected by comparing the thermoreflectance measured at different thermal diffusion length. (3) Due to the noncontact nature and scanning capability, the proposed porosity inspection technique can be readily applied to online porosity monitoring during the DED process. It is inferred that, together with instantaneous correction actions, enhanced quality of the manufactured objects can be achieved. In this paper, offline validation tests were performed on Ti-6Al-4V samples manufactured with different DED printing parameters.
APA, Harvard, Vancouver, ISO, and other styles
6

Parmar, Parth, Sachin Alya, Ramesh Singh, and Anil Saigal. "Development of a Thermal Barrier Coating via Direct Energy Deposition." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-73730.

Full text
Abstract:
Abstract Laser cladding is a direct energy deposition method that is used to deposit desired property material on the substrate with sound metallurgical bond and has well-known applications, like surface depositions, for improving or altering the corrosion and/or wear resistance of the material. The laser cladding process involves various physical phenomena occurring together. It is a layer by layer deposition technique. The accuracy and precision of the laser cladding process are high because of the controlled heat input and minimal dilution. With these beneficial aspects, laser cladding finds application in the development of a thermal barrier coating. This paper is focused on the development and characterization of a thermal barrier coating via laser cladding. Parametric study to clad Yttria Stabilized Zirconia (8YSZ) on H13 tool steel was performed using 3kW fiber laser and 6-axis KUKA robot. For the engineered thermal response of the thermal barrier coating, i.e., thermal diffusivity, different methods were studied. Characterization of the laser flash method is done for accurate thermal diffusivity measurement. In addition, the effects of process parameters such as scanning speed, laser power, and powder flow rate on the macro clads and micro clad geometry, surface roughness, and microhardness have been studied. The deposition height and width were found to be increasing with an increae in laser power for both microscale and macro-scale depositions. Also, if the scanning speed is increased, the deposition height and width decrease. The hardness of the deposited Yttria-Stabilised Zirconia coating was found to be ∼1400 HV.
APA, Harvard, Vancouver, ISO, and other styles
7

Liu, Michael, and Mathew Kuttolamadom. "Characterization of Co-Cr-Mo Alloys Manufacturing via Directed Energy Deposition." In ASME 2021 16th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/msec2021-64111.

Full text
Abstract:
Abstract In this study, Co-Cr-Mo samples that were fabricated via directed energy deposition (DED) at various laser powers and powder feed rates were characterized to ascertain their microstructure and mechanical properties. Co-Cr-Mo is a common alloy for total hip and knee replacements, dental, and support structures due to its biocompatibility, hardness and abrasion resistance, making them a preferred alloy for metal-on-metal (MOM) contact. This study was undertaken to understand the pertinent process parameters that would generate structurally viable bulk structures. High-resolution microscopy and spectroscopy revealed the presence of networked and jagged carbides with varying amounts of Mo. Further, XRD confirmed the presence of the γ and ε phases. Micro- and nano-scale characterization of the alloy fabricated at different process conditions showed material properties in line with those made via traditional processing approaches such as casting. Altogether, this investigation provided an understanding of the effect of additive manufacturing process parameters on the microstructure and properties of Co-Cr-Mo.
APA, Harvard, Vancouver, ISO, and other styles
8

Scott-Emuakpor, Onome, Brian Runyon, Tommy George, Andrew Goldin, Casey Holycross, Luke Sheridan, Dino Celli, et al. "Structural Integrity Assessments for Validating Directed Energy Deposition Repairs of Integrally Bladed Rotor." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14361.

Full text
Abstract:
Abstract Considerable steps to assess the structural capability of laser directed energy deposition (DED) aim to determine the viability of repair processes for integrally bladed rotors (IBRs). Two laser DED processes are under investigation in this study: wire fed and blown powder feedstock. Using a small subsonic Titanium 6Al-4V fan as the component of interest, a series of tests and associated models for laboratory specimens, subcomponents, and components are necessary for proper assessment of material structural properties pertaining to the intended mission of the IBR. Experimentation on laboratory specimens acquire properties such as tensile strength, elongation, low cycle fatigue (LCF), high cycle fatigue (HCF), crack growth rate, and fracture toughness. Subcomponent test articles fabrication occurs by sectioning an operational IBR into individual blades for vibration HCF assessment. Component level testing focuses on LCF and overspeed strength acquired from spin rig testing. Even though the full IBR repair validation of laboratory specimen, subcomponent, and component testing has yet to be completed, the results to-date for laser DED repairs are promising. Furthermore, this plan for structural integrity assessment can serve as a reference for validation of future IBR repair processes.
APA, Harvard, Vancouver, ISO, and other styles
9

Kersten, Samuel, Maxwell Praniewicz, Omar Elsayed, Thomas Kurfess, and Christopher Saldana. "Parametric Study and Multi-Criteria Optimization in Laser Directed Energy Deposition of 316L Stainless Steel." In ASME 2020 15th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/msec2020-8389.

Full text
Abstract:
Abstract Directed Energy Deposition (DED) is an additive manufacturing technique in which a heat source is used to generate a small pool of molten material while powder feedstock is fed into the melt pool to create tracks of raised material on the surface of a part. Given the appropriate process parameters for the chosen material system and process conditions, fully dense complex geometric features are able to be constructed. In order to generate a high quality clad, two main criteria must be met: sufficient bonding with the substrate with minimized dilution of the clad by the base material and minimal porosity. Track shape is a key indicator in determining the quality of the process. This paper evaluates the influence of several of the key processing parameters — laser power, scanning speed, and powder mass flowrate — on single-clad track morphology. An analysis of variance (ANOVA) is performed to evaluate the significance of the main input parameters and the interactions between multiple parameters. A second-order polynomial model is then fit to the data to allow for predictive modelling of track shape based on a set of inputs. Finally, a multi-criteria cost function is generated, and sequential quadratic programming is performed to solve the objective function. Through these operations, the correct combination of processing parameters can be selected in order to generate a cladded track with desirable geometric traits.
APA, Harvard, Vancouver, ISO, and other styles
10

Wang, Qian, Jianyi Li, Abdalla R. Nassar, Edward W. Reutzel, and Wesley Mitchell. "Build Height Control in Directed Energy Deposition Using a Model-Based Feed-Forward Controller." In ASME 2018 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/dscc2018-9058.

Full text
Abstract:
Control of deposition geometry is critical for repair and fabrication of complex components through directed energy deposition (DED). However, current limited sensing technology is often one of the bottlenecks that make it difficult to implement a real-time, measurement-feedback control of build geometry. Hence, this paper proposes to implement the control trajectories from a model-based, simulated-output feedback controller (where the controller uses simulated rather than measured outputs for feedback) as a feed-forward controller in a real DED process. We illustrate the effectiveness of such feed-forward implementation of a model-based, simulated-output feedback controller in the height control of a L-shaped structure via varying laser power in a DED process. Experimental validation shows that by applying the proposed feed-forward controller for laser power, the resulting build has (30%–50%) increased accuracy in achieving the target build height than applying laser with constant power or experience-based, hatch-dependent laser power. Results in this paper indicate that applying a simulated-output feedback controller could be a practical alternative for the control of DED (or other additive manufacturing processes) before the sensing technologies are matured enough to support real-time, measurement-feedback controller.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Laser directed energy deposition"

1

Tekalur, Arjun, Jacob Kallivayalil, Jason Carroll, Mike Killian, Benjamin Schultheis, Anil Chaudhary, Zackery McClelland, Jeffrey Allen, Jameson Shannon, and Robert Moser. Additive manufacturing of metallic materials with controlled microstructures : multiscale modeling of direct metal laser sintering and directed energy deposition. Engineer Research and Development Center (U.S.), July 2019. http://dx.doi.org/10.21079/11681/33481.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Niyanth S, Niyanth, Sebastien Dryepondt, and Kevin Field. Investigation of laser direct energy deposition for production of ODS alloys. Office of Scientific and Technical Information (OSTI), September 2018. http://dx.doi.org/10.2172/1658016.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Slattery, Kevin, and Kirk A. Rogers. Internal Boundaries of Metal Additive Manufacturing: Future Process Selection. SAE International, March 2022. http://dx.doi.org/10.4271/epr2022006.

Full text
Abstract:
In the early days, there were significant limitations to the build size of laser powder bed fusion (L-PBF) additive manufacturing (AM) machines. However, machine builders have addressed that drawback by introducing larger L-PBF machines with expansive build volumes. As these machines grow, their size capability approaches that of directed energy deposition (DED) machines. Concurrently, DED machines have gained additional axes of motion which enable increasingly complex part geometries—resulting in near-overlap in capabilities at the large end of the L-PBF build size. Additionally, competing technologies, such as binder jet AM and metal material extrusion, have also increased in capability, albeit with different starting points. As a result, the lines of demarcation between different processes are becoming blurred. Internal Boundaries of Metal Additive Manufacturing: Future Process Selection examines the overlap between three prominent powder-based technologies and outlines an approach that a product team can follow to determine the most appropriate process for current and future applications.
APA, Harvard, Vancouver, ISO, and other styles
4

Love, Lonnie, Ryan Dehoff, Phillip Chesser, and Brian Jordan. Application of Directed Energy Deposition for Transformational Challenge Reactor Core. Office of Scientific and Technical Information (OSTI), September 2019. http://dx.doi.org/10.2172/1891425.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Lewis, G. K., and J. O. Nemec, R. B. Milewski. Directed light fabrication--a laser metal deposition process for fabrication of near-net shape components. Office of Scientific and Technical Information (OSTI), October 1997. http://dx.doi.org/10.2172/534514.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Qin, Hantang, Beiwen Li, and Iris Rivero. In-situ Nondestructive Evaluation of In-flight Particle Dynamics and Intrinsic Properties for Directed Energy Deposition. Office of Scientific and Technical Information (OSTI), September 2021. http://dx.doi.org/10.2172/1897194.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Apruzese, J. P., J. D. Sethian, J. L. Giuliani, and M. F. Wolford. Ar-Xe Laser: The Path to a Robust, All-Electric Shipboard Directed Energy Weapon. Fort Belvoir, VA: Defense Technical Information Center, December 2008. http://dx.doi.org/10.21236/ada491950.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Sridharan, Niyanth, Justin S. Baba, Brian H. Jordan, Ralph Barton Dinwiddie, and Ryan R. Dehoff. Understanding Part to Part Variability During Directed Energy Deposition Processes Using In Situ and Ex Situ Process Characterization. Office of Scientific and Technical Information (OSTI), June 2018. http://dx.doi.org/10.2172/1459280.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Wisoff, P. J. Diode Pumped Alkaline Laser System: A High Powered, Low SWaP Directed Energy Option for Ballistic Missile Defense High-Level Summary - April 2017. Office of Scientific and Technical Information (OSTI), April 2017. http://dx.doi.org/10.2172/1357366.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Laser directed energy deposition' for particular source types:
Journal articles Dissertations / Theses
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography