Bibliografie tematiche / Precipitation hardeninig

Letteratura scientifica selezionata sul tema "Precipitation hardeninig"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 1 febbraio 2022

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Articoli di riviste sul tema "Precipitation hardeninig"

1

Ardell, A. J. "Precipitation hardening". Metallurgical Transactions A 16, n. 12 (dicembre 1985): 2131–65. http://dx.doi.org/10.1007/bf02670416.

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Starink, Marco J. "Modelling of Precipitation Hardening in Alloys: Effective Analytical Submodels for Impingement and Coarsening". Materials Science Forum 539-543 (marzo 2007): 2365–70. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.2365.

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Abstract (sommario):
To predict strength evolution of precipitation hardening alloys, a wide range of modelling approaches have been proposed. The most accurate published models are physics-based approaches which use both nanoscale processes with their related constants and parameters, as well as parameters calibrated to one or more macroscale measurements of yield strength of one or more samples. Recent developments in submodels including analytical expressions for volume fraction and size evolution including impingement and coarsening are reviewed. It is also shown that Kampmann-Wagner and JMAK models are generally not consistent with data on the progress of precipitations in the main precipitation hardening Al alloys systems, and improved model formulations are described.
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3

NIU, Jing. "Precipitation-hardening and toughness of precipitation-hardening stainless steel FV520(B)". Chinese Journal of Mechanical Engineering 43, n. 12 (2007): 78. http://dx.doi.org/10.3901/jme.2007.12.078.

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Gladman, T. "Precipitation hardening in metals". Materials Science and Technology 15, n. 1 (gennaio 1999): 30–36. http://dx.doi.org/10.1179/026708399773002782.

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5

Furui, Mitsuaki, Susumu Ikeno e Seiji Saikawa. "Intragranular and Grain Boundary Precipitations with Aging Treatment in Mg-Al System Alloys Poured into Gravity Mold". Materials Science Forum 706-709 (gennaio 2012): 1140–45. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.1140.

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It is well-known that age hardening occurs in Mg-Al system alloys, when the alloy containing aluminum exceeds 6mass%. This precipitation reaction depends on aluminum content and aging temperature. The aging behavior in AZ91 magnesium alloy was investigated and it is the subject of this paper. However, for the Mg-Al system alloys, the influence of aluminum content on aging hardening characteristics has not been researched in detail so far. In this study, continuous and discontinuous precipitations during aging in Mg-Al system alloys cast into sand and iron molds were investigated by means of hardness measurement and microstructure observation with optical microscopy and transmission electron microscopy. Variation of hardness with aging was found to be caused mainly by the discontinuous precipitation along the grain boundaries from the composite rule in hardness. In iron mold castings, It was found that the variation of hardness with aging was found to be caused mainly by the continuous precipitation inside the crystal grain.
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Herrnring, Jan, Nikolai Kashaev e Benjamin Klusemann. "Precipitation Kinetics of AA6082: An Experimental and Numerical Investigation". Materials Science Forum 941 (dicembre 2018): 1411–17. http://dx.doi.org/10.4028/www.scientific.net/msf.941.1411.

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The development of simulation tools for bridging different scales are essential for understanding complex joining processes. For precipitation hardening, the Kampmann-Wagner numerical model (KWN) is an important method to account for non-isothermal second phase precipitation. This model allows to describe nucleation, growth and coarsening of precipitation hardened aluminum alloys based on a size distribution for every phase which produces precipitations. In particular, this work investigates the performance of a KWN model by [1-3] for Al-Mg-Si-alloys. The model is compared against experimental data from isothermal heat treatments taken partially from [2]. Additionally, the model is used for investigation of the precipitation kinetics for a laser beam welding process, illustrating the time-dependent development of the different parameters related to the precipitation kinetics and the resulting yield strength.
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Hornbogen, Erhard. "Hundred years of precipitation hardening". Journal of Light Metals 1, n. 2 (maggio 2001): 127–32. http://dx.doi.org/10.1016/s1471-5317(01)00006-2.

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Militzer, Matthias, Warren J. Poole e Weiping Sun. "Precipitation hardening of HSLA steels". Steel Research 69, n. 7 (luglio 1998): 279–85. http://dx.doi.org/10.1002/srin.199805550.

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Shaikh, M. A., M. Ahmad, K. A. Shoaib, J. I. Akhter e M. Iqbal. "Precipitation hardening in Inconel*625". Materials Science and Technology 16, n. 2 (febbraio 2000): 129–32. http://dx.doi.org/10.1179/026708300101507613.

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Zhao, Changhao, Shuang Gao, Tiannan Yang, Michael Scherer, Jan Schultheiß, Dennis Meier, Xiaoli Tan et al. "Precipitation Hardening in Ferroelectric Ceramics". Advanced Materials 33, n. 36 (24 luglio 2021): 2102421. http://dx.doi.org/10.1002/adma.202102421.

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Tesi sul tema "Precipitation hardeninig"

1

Buha, Joka School of Materials Science &amp engineering UNSW. "Interrupted ageing of Al-Mg-Si-Cu alloys". Awarded by:University of New South Wales. School of Materials Science and engineering, 2005. http://handle.unsw.edu.au/1959.4/20794.

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This thesis systematically investigates the effects of a recently developed modified ageing procedure of aluminium alloys, termed the T6I6 temper, on the microstructural development and mechanical properties of the Al ??? Mg ??? Si - Cu alloy 6061. For the T6I6 temper, a conventional single stage T6 temper is interrupted by an ageing period at a reduced temperature (65??C) to facilitate secondary precipitation, before resuming the final ageing at the temperature of the initial T6 treatment. The T6I6 temper was found to cause simultaneous increases in tensile properties, hardness, and toughness as compared with 6061 T6. Al ??? Mg ??? Si ??? Cu alloys are medium strength alloys widely used in the automotive industry and their further improvement is underpinned by stringent demands for weight reduction placed on the transportation industry in recent years. The potential for further improvement of the mechanical properties was found in the control of secondary precipitation that may take place even in some fully aged alloys when exposed to reduced temperatures. The overall improvement in the mechanical properties of 6061 T6I6 was attributed to the formation of finer and more densely dispersed precipitates in the final microstructure. The refinement of precipitates was facilitated by control of the precipitation processes and gradual evolution of the microstructure throughout each stage of the T6I6 treatment. The results indicated that the concentration and the chemical environment of the vacancies controlled the precipitation processes in this alloy. Findings also show that the proportion of the different precipitate phases present in the final microstructure, as well as the amount of the solute in these precipitates, can be controlled and modified utilizing secondary precipitation. A number of analytical techniques were used in this study. The evolution of the microstructure was studied using Transmission Electron Microscopy (TEM), High Resolution TEM (HRTEM) and Three Dimensional Atom Probe (3DAP). Vacancy-solute interactions were studied using Positron Annihilation Lifetime Spectroscopy (PALS) and 3DAP. The distribution of the solute was studied using 3DAP and Nuclear Magnetic Resonance (NMR). Differential Scanning Calorimetry (DSC) was used to identify precipitation reactions and to determine the stability of vacancy-associated aggregates.
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Zeng, Ruilin. "Precipitation hardening in AZ91 magnesium alloy". Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4695/.

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The microstructure evolution of a sand cast AZ91 magnesium alloy during heat treatment (solution treatment and subsequent ageing) were characterized quantitatively using a combination of optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The area fraction of discontinuous precipitates and number density of continuous precipitates (N\(_V\)) in the AZ91 alloys with and without pre-deformation were measured using OM and TEM, respectively. Based on these metallurgical evidences, the existing precipitation strengthening mode for AZ91 was modified and the effect of pre-deformation on the precipitation strengthening of AZ91 was investigated. Al-Mn-(Mg) particles in the size range of 20-200 nm have been found in the as-cast AZ91. Their morphologies, chemical composition and structures were investigated using TEM. It was found that these particles have a chemical composition of (Al \(_6\)\(_.\)\(_5\)\(_2\)Mn) \(_1\)\(_-\)\(_x\)Mg\(_x\) (x < 0.13) and a decagonal quasi-crystalline structure. These particles were stable during a solution treatment and acted as preferential nucleation sites for continuous Mg\(_1\)\(_7\)Al\(_1\)\(_2\) precipitates during the subsequent ageing. The results obtained using two electron tomography (ET) approaches were also summarized in this thesis. One uses HAADF-STEM for Mg\(_1\)\(_7\)Al\(_1\)\(_2\) precipitates on Al-Mn-(Mg) particles. The other technique is BF-STEM applied to study Mg\(_1\)\(_7\)Al\(_1\)\(_2\) precipitates on the dislocations.
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Adegoke, Olutayo. "Homogenization of Precipitation Hardening Nickel Based Superalloys". Thesis, Högskolan Dalarna, Materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:du-11135.

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Allvac 718 Plus and Haynes 282 are relatively new precipitation hardening nickel based superalloys with good high temperature mechanical properties. In addition, the weldability of these superalloys enhances easy fabrication. The combination of high temperature capabilities and superior weldability is unmatched by other precipitation hardening superalloys and linked to the amount of the γ’ hardening precipitates in the materials. Hence, it is these properties that make Allvac 718 Plus and Haynes 282 desirable in the manufacture of hot sections of aero engine components. Studies show that cast products are less weldable than wrought products. Segregation of elements in the cast results in inhomogeneous composition which consequently diminishes weldability. Segregation during solidification of the cast products results in dendritic microstructure with the segregating elements occupying interdendritic regions. These segregating elements are trapped in secondary phases present alongside γ matrix. Studies show that in Allvac 718Plus, the segregating phase is Laves while in Haynes 282 the segregating phase is not yet fully determined. Thus, the present study investigated the effects of homogenization heat treatments in eliminating segregation in cast Allvac 718 Plus and Haynes 282. Paramount to the study was the effect of different homogenization temperatures and dwell time in the removal of the segregating phases. Experimental methods used to both qualify and quantify the segregating phases included SEM, EDX analysis, manual point count and macro Vickers hardness tests. Main results show that there is a reduction in the segregating phases in both materials as homogenization proceeds hence a disappearance of the dendritic structure. In Allvac 718 Plus, plate like structures is observed to be closely associated with the Laves phase at low temperatures and dwell times. In addition, Nb is found to be segregating in the interdendritic areas. The expected trend of increase in Laves as a result of the dissolution of the plate like structures at the initial stage of homogenization is only detectable for few cases. In Haynes 282, white and grey phases are clearly distinguished and Mo is observed to be segregating in interdendritic areas.
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Zangiabadi, Amirali. "Low-temperature interstitial hardening of 15-5 precipitation hardening martensitic stainless steel". Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1480769348244855.

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Kubota, Masahiro 1967. "The precipitation hardening response in A1-Mg(-Ag) alloys". Monash University, Dept. of Materials Engineering, 2001. http://arrow.monash.edu.au/hdl/1959.1/9204.

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Ross, T. "Structure and precipitate morphology relationships in a 68Cr-32Ni binary system". Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-04212010-143716/.

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Huang, Kai. "Precipitation Strengthening in Al-Ni-Mn Alloys". Digital WPI, 2015. https://digitalcommons.wpi.edu/etd-theses/384.

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Precipitation hardening of eutectic and hypoeutectic Al-Ni alloys by 2-4 wt pct. manganese is investigated with focus on the effect of the alloys’ chemical composition and solidification cooling rate on microstructure and tensile strength. Within the context of the investigation, mathematical equations based on the Orowan Looping strengthening mechanism were used to calculate the strengthening increment contributed by each of the phases present in the aged alloy. The calculations agree well with measured values and suggest that the larger part of the alloy’s yield strength is due to the Al3Ni eutectic phase, this is closely followed by contribution from the Al6Mn particles, which precipitate predominantly at grain boundaries
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Gan, Wei. "Precipitation and strengthening in AL-GE-SI alloys". The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1135275701.

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Nicol, Alison. "Aspects of copper precipitation and irradiation hardening in Fe-Cu alloys". Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325841.

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Gwalani, Bharat. "Developing Precipitation Hardenable High Entropy Alloys". Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1011755/.

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High entropy alloys (HEAs) is a concept wherein alloys are constructed with five or more elements mixed in equal proportions; these are also known as multi-principle elements (MPEs) or complex concentrated alloys (CCAs). This PhD thesis dissertation presents research conducted to develop precipitation-hardenable high entropy alloys using a much-studied fcc-based equi-atomic quaternary alloy (CoCrFeNi). Minor additions of aluminium make the alloy amenable for precipitating ordered intermetallic phases in an fcc matrix. Aluminum also affects grain growth kinetics and Hall-Petch hardenability. The use of a combinatorial approach for assessing composition-microstructure-property relationships in high entropy alloys, or more broadly in complex concentrated alloys; using laser deposited compositionally graded AlxCrCuFeNi2 (0 < x < 1.5) complex concentrated alloys as a candidate system. The composition gradient has been achieved from CrCuFeNi2 to Al1.5CrCuFeNi2 over a length of ~25 mm, deposited using the laser engineered net shaping process from a blend of elemental powders. With increasing Al content, there was a gradual change from an fcc-based microstructure (including the ordered L12 phase) to a bcc-based microstructure (including the ordered B2 phase), accompanied with a progressive increase in microhardness. Based on this combinatorial assessment, two promising fcc-based precipitation strengthened systems have been identified; Al0.3CuCrFeNi2 and Al0.3CoCrFeNi, and both compositions were subsequently thermo-mechanically processed via conventional techniques. The phase stability and mechanical properties of these alloys have been investigated and will be presented. Additionally, the activation energy for grain growth as a function of Al content in these complex alloys has also been investigated. Change in fcc grain growth kinetic was studied as a function of aluminum; the apparent activation energy for grain growth increases by about three times going from Al0.1CoCrFeNi (3% Al (at%)) to Al0.3CoCrFeNi. (7% Al (at%)). Furthermore, Al addition leads to the precipitation of highly refined ordered L12 (γ′) and B2 precipitates in Al0.3CoCrFeNi. A detailed investigation of precipitation of the ordered phases in Al0.3CoCrFeNi and their thermal stability is done using atom probe tomography (APT), transmission electron microscopy (TEM) and Synchrotron X-ray in situ and ex situ analyses. The alloy strengthened via grain boundary strengthening following the Hall-Petch relationship offers a large increment of strength with small variation in grain size. Tensile strength of the Al0.3CoFeNi is increased by 50% on precipitation fine-scale γ′ precipitates. Furthermore, precipitation of bcc based ordered phase B2 in Al0.3CoCrFeNi can further strengthen the alloy. Fine-tuning the microstructure by thermo-mechanical treatments achieved a wide range of mechanical properties in the same alloy. The Al0.3CoCrFeNi HEA exhibited ultimate tensile strength (UTS) of ~250 MPa and ductility of ~65%; a UTS of ~1100 MPa and ductility of ~30%; and a UTS of 1850 MPa and a ductility of 5% after various thermo-mechanical treatments. Grain sizes, precipitates type and size scales manipulated in the alloy result in different strength ductility combinations. Henceforth, the alloy presents a fertile ground for development by grain boundary strengthening and precipitation strengthening, and offers very high activation energy of grain growth aptly suitable for high-temperature applications.
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Libri sul tema "Precipitation hardeninig"

1

Martin, J. W. Precipitation hardening. 2a ed. Oxford: Butterworth-Heinemann, 1998.

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2

Ragulʹskis, K. M. Vibrat͡s︡ionnoe starenie. Leningrad: "Mashinostroenie," Leningradskoe otd-nie, 1987.

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Levinskiĭ, I︠U︡ V. Vnutrenneokislennye i vnutrenneazotirovannye nanomaterialy. Moskva: Ėkomet, 2007.

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4

Ellis, David L. Precipitation strengthened high strength, high conductivity Cu-Cr-Nb alloys produced by chill block melt spinning. [Washington, D.C.]: National Aeronautics and Space Administration, 1989.

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1955-, Voorhees P. W., a cura di. Growth and coarsening: Ostwald ripening in materials processing. New York: Springer, 2002.

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Precipitation Hardening. Elsevier, 1998. http://dx.doi.org/10.1016/c2009-0-24506-5.

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N, Dey B., ASM International. Annealing and Recovery Committee. e World Materials Congress (1988 : Chicago, Ill.), a cura di. Precipitation phenomena: Deformation and aging : proceedings of an international conference held in conjunction with the 1988 World Materials Congress, Chicago, Illinois, USA, 24-30 September 1988. [Metals Park, Ohio]: ASM International, 1988.

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Strain aging behavior in NiAl microalloyed with interstitial and substitutional solutes. [Washington, DC: National Aeronautics and Space Administration, 1997.

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United States. National Aeronautics and Space Administration., a cura di. Investigation of strain aging in the ordered intermetallic compound [beta]-NiAl. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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Ratke, Lorenz, e Peter W. Voorhees. Growth and Coarsening: Ostwald Ripening in Material Processing (Engineering Materials). Springer, 2002.

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Capitoli di libri sul tema "Precipitation hardeninig"

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Hornbogen, Erhard. "Precipitation Hardening - The Oldest Nanotechnology". In Lightweight Alloys for Aerospace Application, 1–11. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118787922.ch1.

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Dominguez-Rodriguez, A., e A. H. Heuer. "Precipitation Toughening and Precipitation Hardening in Y2O3-Stabilized ZrO2 Crystals". In Surfaces and Interfaces of Ceramic Materials, 761–76. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1035-5_47.

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Ren, Hui Ping, Hai Yan Wang, Zong Chang Liu e Lin Chen. "Precipitation Hardening in Fe-1.03%Cu Structural Steel". In Materials Science Forum, 111–14. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-462-6.111.

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Guo, Guannan, Qigui Wang, Gang Wang e Yiming Rong. "A Brief Review of Precipitation Hardening Models for Aluminum Alloys". In 2ndWorld Congress on Integrated Computational Materials Engineering, 249–54. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118767061.ch40.

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Guo, Guannan, Qigui Wang, Gang Wang e Yiming Rong. "A Brief Review of Precipitation Hardening Models for Aluminum Alloys". In Proceedings of the 2nd World Congress on Integrated Computational Materials Engineering (ICME), 249–54. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-48194-4_40.

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Yang, Yang, e Paul Sanders. "Precipitation Hardening of Supersaturated Al–Sc–Zr Produced via Melt-Spinning". In TMS 2019 148th Annual Meeting & Exhibition Supplemental Proceedings, 1421–26. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05861-6_135.

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Yan, Liu, Jiang Daming e Wu Gaohui. "Ageing Hardening and Precipitation of the 7A60 Alloys during Cooling Aging". In ICAA13: 13th International Conference on Aluminum Alloys, 1173–80. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495292.ch176.

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Andersson, Joel. "Review of Weldability of Precipitation Hardening Ni- and Fe-Ni-Based Superalloys". In Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications, 899–916. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-89480-5_60.

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Smyrak, Beata, Tadeusz Knych, Andrzej Mamala, Kinga Korzeń e Piotr Osuch. "A Study of the Influence of Strain Hardening and Precipitation Hardening Sequence on Mechanical Properties of AlMgSi Conductor Alloys". In ICAA13 Pittsburgh, 1791–96. Cham: Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-48761-8_268.

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Smyrak, Beata, Tadeusz Knych, Andrzej Mamala, Kinga Korzeń e Piotr Osuch. "A Study of the Influence of Strain Hardening and Precipitation Hardening Sequence on Mechanical Properties of AlMgSi Conductor Alloys". In ICAA13: 13th International Conference on Aluminum Alloys, 1791–96. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495292.ch268.

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Atti di convegni sul tema "Precipitation hardeninig"

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Daurelio, Giuseppe, Antonio D. Ludovico, Christos N. Panagopoulos e Corrado Tundo. "Ferritic, martensitic, and precipitation hardening stainless steel laser weldings". In Second GR-I International Conference on New Laser Technologies and Applications, a cura di Alexis Carabelas, Paolo Di Lazzaro, Amalia Torre e Giuseppe Baldacchini. SPIE, 1998. http://dx.doi.org/10.1117/12.316611.

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Xavior, M. Anthony, P. Ashwath e R. Rajendran. "Effect of Precipitation Hardening on Particle Reinforced Aluminum Alloy Composites". In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50103.

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In this research work two different composites are manufactured using Aluminum Alloy (AA) 2900 and 2024 as matrix with SiC and Al2O3 as reinforcement material through powder metallurgy technique. The objectives of this research work are to determine the influence of the sintering duration on the properties of composites and to understand the effect of different aging time on the properties of the composites. The weight percentage of reinforcement materials, sintering duration and aging duration were considered as variable parameters in this experimental work. The metal powder and the reinforcement are blended in high energy ball mill and compacted in Universal Testing Machine at a constant load of 500Mpa to fabricate green compacts. The green compacts were subjected to microwave sintering at 500°C for 60 minutes as per the design of experiments. The sintered samples are quenched in water till it reaches the temperature close to room temperature and loaded again into the sintering furnace for artificial aging (for a varying duration of 60 & 120 minutes). This will allow the samples to form CuAl2 and CuMgAl2 precipitates which are confirmed using SEM and X-ray diffraction studies. Hardness studies are carried out using Rockwell and Brinell hardness tester respectively.
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Pistofidis, N., G. Vourlias, P. Psyllaki, K. Chrissafis, Angelos Angelopoulos e Takis Fildisis. "Theoretical Study of the Oxidation Behavior of Precipitation Hardening Steel". In ORGANIZED BY THE HELLENIC PHYSICAL SOCIETY WITH THE COOPERATION OF THE PHYSICS DEPARTMENTS OF GREEK UNIVERSITIES: 7th International Conference of the Balkan Physical Union. AIP, 2010. http://dx.doi.org/10.1063/1.3322567.

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Ozturk, Utkudeniz, Jose Maria Cabrera e Jessica Calvo. "A Physically Based Model for High Temperature Deformation of Inconel 718Plus™". In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64043.

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The microstructural evolution of Inconel 718Plus during hot forming operations is modeled through a physically based model which includes the effects of precipitating particles. Inconel 718Plus has been a successful alloy since its introduction in 2003 owing to its moderate cost, good formability and weldability, and its higher maximum service temperature compared to its ancestor, Inconel 718. It is well known that the service performance and hot-flow characteristics of this alloy are strongly dependent on the microstructure, particularly the grain size. Thus, comprehension of the microstructural evolution and its modeling is an important task. In precipitation hardening superalloys and microalloyed steels, it is particularly more challenging to model the microstructural evolution in the processing windows where material softening and precipitation processes take place concurrently. The model presented in this work is based on dislocation density evolution which is considered as a result of the competition between dislocation generation and dynamic recovery at the early stages of deformation. In the hardening region, recovery through climb is described by the diffusion of vacancies and glide is assumed to be proportional to the strain rate in accordance with the models proposed by Bergstrom. Since the deformation is assumed to be controlled by glide and climb, the peak stress is modeled based on a modified hyperbolic-sine model which takes into account the temperature dependence of self-diffusion of Nickel and elastic modulus. It is known that under high temperature deformation conditions Inconel 718Plus may undergo dynamic precipitation. Second-phase particles in the material may impede the grain boundary motion and contribute to an increase in flow-stress due to Orowan looping. To account for the dynamic precipitation, the present model combines previously obtained experimental results and precipitation models to predict volume fraction and particle radius. For the peak stress modeling, the effect of precipitation is expressed as an extra stress term. The flow stress is calculated for the deformed and the recrystallized material separately and the total flow stress for the material is calculated using a law of mixtures considering the fraction of recrystallized material, while recrystallization is described as a nucleation-growth process via Avrami formalism. Cylindrical compression tests were employed to observe the hot flow behavior and validate the model. The predictions are compared with the experimental findings and good agreement is observed.
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5

Sathyanath, Athul, e Anil Meena. "Influence of Precipitation and Dislocation Density on Flow Stress Characteristics Under Compression Deformation of Heat-Treated 17-4 PH Stainless Steel Alloy". In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11201.

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Abstract The strengthening mechanism of 17-4 PH stainless steel is mainly due to the precipitation of copper particles in the martensitic lath matrix. The renowned steel grade possesses an exceptional combination of high strength and excellent corrosion resistance and hence is widely employed in high stress environments. In that case, under external loading, the movement and accumulation of dislocations are influenced by the nature of precipitation. Hence, the present study is based on the impact of precipitation on the dislocation induced hardening during compression of the heat-treated 17-4 PH stainless steel. Room temperature uniaxial compression test was used to evaluate the direct effect of precipitates and the dislocation interaction on the flow stress and strain-hardening behavior under the different heat-treated regime. Microstructural evolution during deformation and its influence on the strain-hardening mechanism were analyzed by optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). A semi-empirical model was adopted to quantify the role of precipitate nature on the strain-hardening rate. The evaluated normalized microstrain and dislocation density from the XRD analyses were used to explain the observed variation in the mechanical property. Coarse particle precipitation was found to greatly affect the strain-hardening behavior of the steel alloy during compression deformation.
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Wen, Peng, Gang Wang e Zhenhua Feng. "Hot wire laser cladding for repairing martensite precipitation hardening stainless steel". In ICALEO® 2015: 34th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2015. http://dx.doi.org/10.2351/1.5063188.

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7

Rathod, N. R., e J. V. Menghani. "Influence of precipitation hardening in aluminum based systems: A literature review". In PROCEEDINGS OF THE 14TH ASIA-PACIFIC PHYSICS CONFERENCE. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0036156.

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8

Groh, J. R., e J. F. Radavich. "Effects of Iron, Nickel, and Cobalt on Precipitation Hardening of Alloy 718". In Superalloys. TMS, 1991. http://dx.doi.org/10.7449/1991/superalloys_1991_351_361.

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Kumar, T. V. Vineeth, J. Ekanthappa, K. T. Kashyap e Aditya Mohan Naik. "Studies on precipitation hardening in copper chromium alloy with 1 wt% chromium". In PROCEEDINGS OF INTERNATIONAL CONFERENCE ON ADVANCES IN MATERIALS RESEARCH (ICAMR - 2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0026200.

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10

Dewan, Mohammad W., Muhammad A. Wahab e Khurshida Sharmin. "Effects of Post Weld Heat Treatments (PWHT) on Friction Stir Welded AA2219-T87 Joints". In ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/msec2017-3021.

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Friction Stir Welding (FSW) offers significantly better performance on aluminum alloy joints compared to the conventional fusion arc welding techniques; however, plastic deformation, visco-plastic flow of metals, and complex non-uniform heating cycles during FSW processes, result in dissolution of alloying elements, intrinsic microstructural changes, and post-weld residual stress development. As a consequence, about 30% reduction in ultimate strength (UTS) and 60% reduction in yield strength (YS) were observed in defect-free, as-welded AA2219-T87 joints. PWHT is a common practice to refine grain-coarsened microstructures which removes or redistributes post-weld residual stresses; and improves mechanical properties of heat-treatable welded aluminum alloys by precipitation hardening. An extensive experimental program was undertaken on PWHT of FS-welded AA2219-T87 to obtain optimum PWHT conditions and improvement of the tensile properties. Artificial age-hardening (AH) helped in the precipitation of supersaturated alloying elements produced around weld nugget area during the welding process. As a result, an average 20% improvement in YS and 5% improvements in UTS was observed in age-hardened (AH-170°C-18h) specimens as compared to AW specimens. To achieve full benefit of PWHT, solution-treatment followed by age-hardening (STAH) was performed on FS-welded AA2219-T87 specimens. Solution-treatment (ST) helps in the grain refinement and formation of supersaturated precipitates in aluminum alloys. Age-hardening of ST specimens help in the precipitation of alloying elements around grain boundaries and strengthen the specimens. Optimum aging period is important to achieve better mechanical properties. For FS-welded AA2219-T87 peak aging time was 5 hours at 170°C. STAH-170°C -5h treated specimens showed about 78% JE based on UTS, 61% JE based on yield strength, and 36% JE based on tensile toughness values of base metal.
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Rapporti di organizzazioni sul tema "Precipitation hardeninig"

1

Dunn, B., e A. J. Ardell. Precipitation Hardening of Infrared Transmitting ZnS Ceramics. Fort Belvoir, VA: Defense Technical Information Center, giugno 1993. http://dx.doi.org/10.21236/ada265184.

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2

MYERS, Jr, SAMUEL M., DAVID M. FOLLSTAEDT e JAMES A. KNAPP. Surface Hardening by Nanoparticle Precipitation in Ni(Al,O). Office of Scientific and Technical Information (OSTI), aprile 2001. http://dx.doi.org/10.2172/780314.

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3

Farrara, R. Fatigue-Fracture Properties of a Semi-Austenitic Precipitation Hardening Stainless Steel. Fort Belvoir, VA: Defense Technical Information Center, giugno 1988. http://dx.doi.org/10.21236/ada198751.

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4

Quattrocchi, L. S., D. A. Koss e G. Scarr. Precipitation Hardening of a Beta Titanium Alloy by the Alpha-Two Phase. Fort Belvoir, VA: Defense Technical Information Center, settembre 1991. http://dx.doi.org/10.21236/ada241566.

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5

Underwood, J. H., R. A. Farrara, G. P. O'Hara, J. J. Zalinka e J. R. Senick. Fracture Toughness and Fatigue Crack Initiation Tests of Welded Precipitation-Hardening Stainless Steel. Fort Belvoir, VA: Defense Technical Information Center, gennaio 1990. http://dx.doi.org/10.21236/ada218745.

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6

Hicho, G. E., W. J. Boettinger, L. Swartzendruber e T. R. Shives. Examination of the excessive retained austenite on the surface of a section of 17-7 precipitation hardening stainless steel. Gaithersburg, MD: National Institute of Standards and Technology, 1991. http://dx.doi.org/10.6028/nist.ir.4502.

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Hicho, G. E., C. H. Brady, L. C. Smith e R. J. Fields. Effects of varying precipitation hardening temperatures and times on the ability of HSLA-80 to achieve a yield strength of 689.5 MPa and impact properties comparable to HSLA-100. Gaithersburg, MD: National Bureau of Standards, gennaio 1987. http://dx.doi.org/10.6028/nbs.ir.87-3662.

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