Дисертації з теми "Cobalt base superalloys"
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Reynolds, Gary James. "Damage rate approaches for nickel-base superalloys." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/18863.
Повний текст джерелаMeher, Subhashish. "Comparative Coarsening Kinetics of Gamma Prime Precipitates in Nickel and Cobalt Base Superalloys." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc699871/.
Повний текст джерелаLéglise, Mélissa. "Amélioration des propriétés mécaniques et chimiques de superalliages base nickel et base cobalt de fonderie utilisés pour le fibrage du verre fondu à 1000°C - 1100°C." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0228.
Повний текст джерелаThe fiberizing spinners used to produce the glass fibers undergo sizable mechanical, chemical and thermal solicitations. Therefore, this piece is degraded and must be periodically replaced. The purpose of these works is to increase the lifetime of the fiberizing spinners by improving the mechanical and chemical properties of the superalloys that constitute them. More precisely, the objective of this thesis is, in the first time, to improve the alloys used to fiberize at 1000°C, and in a second time, to find a superalloy that can fiberize at 1125°C. These works are focused on two families of superalloys: nickel-based and cobalt-based. The chemical properties are characterized by the thermogravimetry tests and the mechanical properties by 3 points flexural creep tests. For the Ni-based alloy, the influences of unwanted minority elements, Mn and Si, were studied. The mechanical properties of this alloy are subject to improvement tests by the addition titanium, zirconium, tantalum, hafnium and niobium. The aluminium addition was also experimented but with the aim of improving the chemical properties of the alloy. Finally, the studies were also driven on the addition of noble metals (Pd and Ru) and of rare earths (Y, La and Ce). Concerning the cobalt-based superalloys, the study focused on an alloy which has previously shown good general properties to be used at 1125°C and no at 1000°C. The versius with a lowered content in tantalum, without tungsten and without hafnium were studied. To close this work, the increase of nickel and a heat treatment were studied in order to improve the oxidation resistance of this second alloy
Wertz, Katelun N. "Exploration of Phase Stability and Hot Workability of Polycrystalline Co-Al-W-Base Superalloys." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555455335988532.
Повний текст джерелаSalgado, Marcus Vinicius da Silva. "Processamento e caracterização de ligas do sistema Co-Ni-Al-W-Cr-(Nb,Ta)-C-B visando aplicação como material de ferramenta para soldagem por atrito." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/97/97134/tde-03122015-155841/.
Повний текст джерелаThe objectives of this study were to process and characterize microstructural and mechanical cobalt-based superalloys from Co-Al-W-Ni-Cr-(Nb,Ta)-C-B system with ?/? \' microstructure. Aiming possible application for Friction Stir Welding (FSW) tool in the compositions: (Co-10Al-7.5W-30Ni-10Cr-3.0Nb-0.6C-0.06B %at.) - 30Ni-3Nb, (Co-10Al-7.5W-40Ni-10Cr-3.0Nb-0.6C-0.06B %at. ) - 40Ni-3Nb, (Co-10Al-7.5W-50Ni-10Cr-3.0Nb-0.6C-0.06B %at.) - 50Ni-3Nb, including the patented alloy (Co-10Al-7.5W -40Ni-10Cr-3.0Ta-0.6C-0.06B %at.) - 40Ni-3Ta considered the standard alloy for this project. The microstructural characterization was made by Scanning Electron Microscopy (SEM), Scanning Electron Microscopy with Field Emission Gun (SEM-FEG), semi-quantitative microanalysis measures and chemical mapping by EDS, characterization by X - ray diffraction and mechanical test of hardness Vickers in all the samples. The results of the microstructural and mechanical characterization for 40Ni-3Ta alloy were similar to those found in the literature. The 40Ni-3Nb alloy showed the closest results, among the other alloys studied in comparison with the standard alloy.
Weaver, Donald S. "Thermomechanical Processing of a Gamma-Prime Strengthened Cobalt-Base Superalloy." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1543508199900005.
Повний текст джерелаHuron, Eric S. "High temperature monotonic and cyclic deformation in a directionally solidified nickel-base superalloy." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/16093.
Повний текст джерелаDupin, Nathalie. "Contribution à l’évaluation thermodynamique des alliages polyconstitués à base de nickel." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0040.
Повний текст джерелаUr-Rehman, Hamad [Verfasser], Mathias [Gutachter] Göken, and Uwe [Gutachter] Glatzel. "Solid Solution Strengthening and Diffusion in Nickel- and Cobalt-based Superalloys / Hamad Ur-Rehman. Gutachter: Mathias Göken ; Uwe Glatzel." Erlangen : FAU University Press, 2016. http://d-nb.info/1112737502/34.
Повний текст джерела[Verfasser], Hamad ur Rehman, Mathias [Gutachter] Göken, and Uwe [Gutachter] Glatzel. "Solid Solution Strengthening and Diffusion in Nickel- and Cobalt-based Superalloys / Hamad Ur-Rehman. Gutachter: Mathias Göken ; Uwe Glatzel." Erlangen : FAU University Press, 2016. http://nbn-resolving.de/urn:nbn:de:bvb:29-opus4-74073.
Повний текст джерелаBouzaher, Abdallah. "Réseau bipériodique de dislocations d'hétéro-interface en élasticité anisotrope." Grenoble INPG, 1993. http://www.theses.fr/1993INPG0089.
Повний текст джерелаYasin, Muhammad. "Hot corrosion behavior of modified aluminide coatings on cobalt-base superalloys." Thesis, 1986. http://hdl.handle.net/10945/21894.
Повний текст джерелаSingh, Mahander Pratap. "On understanding the role of V addition in design and development of high specific strength γ'(L12)-strengthened Co-base superalloys". Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4928.
Повний текст джерелаTsang, Chang An, and 臧建安. "Solidification Structure and Aging Behavior of Cobalt-base Superalloy Welds." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/55390005163911142722.
Повний текст джерелаLin, Hung-Mao, and 林宏茂. "Wear Characteristics of Cobalt-Base Superalloy Melted by Plasma Transferred Arc." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/58682864186818194987.
Повний текст джерела國立成功大學
材料科學(工程)學系
86
The surface overlaying treatment is aimed to give different special properties to surfaces and substrates of materials. Microhardness, wear-resistance, corrosion-resistance etc. can be enhanced after treatment. Due to superior mechanical properties, spheroidal graphite (SG) cast irons are widely used in industries such as machine production, automobile components etc. These components generally need to have surfaces with higher microhardness to increase wear-resistance while their cores need to main The results reveal that the overlayer specimen after overlaid can be divided into overlayer, interface region and substrate. The interface region includes interfacial layer and partially melted region which is mainly composed of fine pearlite and ledeburite. The substrate includes heat effect region. The Stellite 6 overlayer melted on SG iron cast with 3.5wt% carbon under low overlaying current (I=140A) is a dentritic structure with M7C3 and M23C6 carbides. On the other hand, the Stellite 1 overlaye The microhardness of Stellite alloy overlayers increases with overlaying currents and so does the amount of carbides. The main reason is that the overlayers are diluted by substrates. Hence, it shows that the microhardness of overlayers is related to overlaying current and the amount of carbides. The results of cutting wear test reaveal that the flank wear width of Stellite alloy overlayers tend to increase as the sliding distance and cutting speed . The flank wear width of Stellite 6 overlayer redu In the cutting wear test, the wear mechanisms of overlayers are mainly plastic groove, surface polish and adhesive wear as adhered to overlayers. Others minor mechanisms include brittle crack and fracture. Among these, the case to plastic groove include microcutting and plough.
Hou-YuCiou and 邱厚諭. "Formability Analysis of HA-188 Cobalt-base Superalloy in Tube Hydroforming." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/19914184737800093915.
Повний текст джерелаTsai, Dir-Don, and 蔡德東. "research of surface integrity of an EDMed cobalt-base superalloy(Elgiloy)." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/02775698302213862024.
Повний текст джерела國立中央大學
機械工程學系
85
ABSTRACTan advanced adaptive control cnc edmmachine is adopted in this research,and keroseneis used as a primary working fluid( dielectric). a minute energy edm machining is operatedin this experiment through various settings ofworking conditions(such as change of electrodepalarity,electrode material,discharge duration,discharge current,planetary motion of electrode, aluminum powderaddition in dielectric and Elgiloy workpiece material status etc)and an optimal edm working condition is obtainedthrough analyzing the results of working efficiency(such as material removal rate and relativeelectrode wear ratio)and surface integrity(such as surface roughness,microcrack,EDAX,EPMA and sectionalmicrohardness etc)
Li, Han-yun, and 黎瀚揚. "Corrosion Behavior and Electrochemical Properties of Commercial Cobalt-based Superalloy." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/23354580752903028757.
Повний текст джерела中國文化大學
材料科學與奈米科技研究所
99
This research made use of different chlorine concentrations and temperatures to explain the commercial cobalt-based super-alloys electrochemical properties and corrosion behavior of the commercial cobalt-based super-alloys in terms of the electrochemical polarization curves. Both SEM and the immersion experiments were used to explain the micro-structure and to understand the effect of temperature and concentration on the pit size. Several different solutions and concentrations were also applied to confer the critical pitting temperature (CPT) of the cobalt-based super-alloys. In three different chloride salts, the corrosion potential (Ecorr) are of little change of temperature and concentration, and the pitting potential (Eb) gradually decreased as temperature increases. Among them, Fecl3 is a rather special case in which the difference between Ecorr and Eb in potential are relatively small which implies the alloy immediately pitted right after the specimen being scanned beyond the Ecorr. The corrosion morphology of the alloy tested in three kinds of chloride solutions at 80oC observed by SEM shows that the corrosion all initiated preferentially at the interdendritic regions which were eventually merged into larger area as time goes on; the damage were particularly pronounced for Fecl3 than the other two.
Sharma, Abhishek. "An Evaluation of the Mechanical Behavior of some new High Temperature Materials." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5254.
Повний текст джерелаBenson, Michael Lee. "Strain-Induced Phase Transformation and Anisotropic Lattice-Strain Development in a Cobalt-Based Superalloy." 2008. http://trace.tennessee.edu/utk_graddiss/327.
Повний текст джерелаChan, Wai-Sing, and 陳偉聲. "Overlaying Characteristics of Cobalt-Base Superalloy Formed on Spheroidal Graphite Cast Iron by Plasma Transferred Arc Melting Process." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/97299387388451847426.
Повний текст джерела國立成功大學
材料科學(工程)研究所
84
The purpose of this study is to overlay an alloy with high wear and corrosion resistant on SG cast irons in order to widen its application. Stellite 1,6 and 21 alloys were overlaid on SG cast irons with various carbon and silicon contents by plasma trans- ferred arc process. Furthermore, tearing property of the speci- mens after overlaying were also invertigated. Results revealed that the variation of the carbon and silicon contents has no effect on the solidification structure of the overlayers with low overlaying current. The solidification structure of the Stellite 1 overlayer is hypereutectic while the Stellite 6and 21 are den- dritic. An interfacial layer which contain large amount of car- bides formed at the interface region between three overlayers and high carbon content substrate. The occurrence of interfacial layer is detrimental to the bonding strength of overlaid speci- mens. The formation of interfacial layer cannot be inhibited by increasing silicon content of substrate. On the other hand, the amount of interfacial layer decreases with decreasing carbon con- tent of the substrate. Tearing strength increased as the amount of the interfacial layer decreased. The overlayers of the high overlaying current specimens are iron rich, this indicated that the overlayers were highly diluted by the substrate, and the tearing strength of these specimens is low. Tearing strength in- creased when the carbon content of substrate decreased.
Jheng, Ming-Hong, and 鄭名翃. "Effect of Hot Isostatic Pressure and Addition of Cobalt Element on High-Temperature Creep of CM-681LC Ni-Base Superalloy." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/arxv7f.
Повний текст джерела義守大學
材料科學與工程學系
106
In this study, CM-681LC nickel-base superalloy was used as the base material to investigate the difference of microstructure and the influence of high temperature creep behavior by Cobalt element addition (+3%) and hot isostatic pressure process. Experimental procedure firstly uses the vacuum induction melting furnace to make the directionally solidified specimens, three-stage heat treatments (solution treatment at 1270°C/4hr/ArC, primary aging at 1038°C/2hr/ArC and secondary aging at 870°C/20hr/ArC), and then ultra-high temperature creep (1050°C/200MPa) experiment. In addition, by increasing the cobalt content and/or performing the hot isostatic pressure process to improve the ultra-high temperature creep life were investigated, and the differences of microstructure were discussed. Analytical experiments employ X-ray diffraction analyzer to identify phases, scanning electron microscope and transmission electron microscope to observe the microstructures. Results show that the hot isostatic pressure process and/or the addition of cobalt element do not improve the ultra-high temperature creep life of directionally solidified CM-681LC nickel-based superalloy; however, the hot isostatic pressure process can enhance the ultra-high temperature creep life of directionally solidified CM-681LC nickel base superalloy with cobalt addition.
Makineni, Surendra Kumar. "Improvement of High Temperature Strength of Al and Co Alloy by L12 Type Coherent Precipitates." Thesis, 2015. https://etd.iisc.ac.in/handle/2005/4348.
Повний текст джерелаKo, Chih-Chien, and 柯志建. "The Effects of Vacuum Sintering and Heat Treatments on the Microstructure and Mechanical Properties of Cobalt Based Superalloy after TiC Particles Dispersion Strengthening." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/65s9x7.
Повний текст джерела國立臺北科技大學
材料及資源工程系研究所
99
Cobalt-based superalloys are used extensively in applications requiring good wear resistance, corrosion resistance and heat resistance. Many of the properties of these alloys arise from the crystallographic nature of cobalt, the solid solution strengthening and carbide precipitation effects of chromium, tungsten and molybdenum. Metal matrix composites are known to exhibit exceptional wear resistance; therefore, several investigators have used titanium carbide (TiC) as a reinforcing medium in a ferrous metal matrix in order to enhance this property. TiC has proved its suitability in Fe or Fe-based alloys due its high hardness, low density and chemical stability with Fe-based alloys. In this study, we have mixed and added different amounts of TiC powders (10, 15 and 20 wt %) to the Cobalt-based superalloy powders. The mixing processed was finished by ball milling and granulation in a laboratory. In addition, the mixing powders (Cobalt-based superalloy and TiC) were sintered at 1260, 1270, 1280 and 1290°C, and then a series of HIP processes and heat treatments were performed. Meanwhile, the parameter of HIP treatment was 1250°C, 125 MPa and 100 min. The heat treatment processes were heating to 1100°C and maintaining for 40 min for quenching; aging at 760°C and soaking time was 6, 9, 12 h, respectively. Various materials characterization techniques were used to evaluate the materials’ properties and microstructures, including: apparent porosity, hardness test, transverse rupture strength (TRS) test, OM, and SEM microstructral examinations. The experimental results show that the highest TRS value of 1566.7 MPa was obtained by the 15 wt% TiC additive powder, which was sintered at 1280°C and then followed by HIP process and solid solution heat treatment. It also has been proved that the closed pores can be effectively eliminated (1.2% → 0.86%) by HIP treatment; in addition, the M6C carbides can produce more uniform precipitation on the grain-boundary and matrix after heat treatment. Furthermore, the highest hardness value of HRA 80.4 was obtained by the 20 wt% TiC additive powder, which was only sintered at 1290°C.