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Relevant bibliographies by topics / Cobalt base superalloys

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Academic literature on the topic 'Cobalt base superalloys'

Author: Grafiati

Published: 6 September 2023

Last updated: 7 September 2023

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Journal articles on the topic "Cobalt base superalloys"

1

Klarstrom, D. L. "Wrought cobalt- base superalloys." Journal of Materials Engineering and Performance 2, no. 4 (August 1993): 523–30. http://dx.doi.org/10.1007/bf02661736.

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2

Suzuki, Akane, Haruyuki Inui, and Tresa M. Pollock. "L12-Strengthened Cobalt-Base Superalloys." Annual Review of Materials Research 45, no. 1 (July 2015): 345–68. http://dx.doi.org/10.1146/annurev-matsci-070214-021043.

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3

Lee, J. S., Je Hyun Lee, Baig Gyu Choi, Chang Yong Jo, Ung Yu Paik, and S. G. Gang. "The Solidification Microstructure and Carbide Formation Behaviors in the Cobalt-Based Superalloy ECY768." Materials Science Forum 486-487 (June 2005): 374–77. http://dx.doi.org/10.4028/www.scientific.net/msf.486-487.374.

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Co-base superalloys have been applied in the stationary compoents of gas turbine owing to their excellent high temperaure properties. The stationary Co-base alloy components are generally manufactured by casting. Solidification behavior of the alloy is an important factor in the selection of casting parameters. In the present study, solidification microstructure and carbide formation behaviors were studied by directional solidification. Directional solidification experiments were carried out at the solidification rates of 0.5 ~ 150µm/s with the Co-base superalloy ECY768. Between the dendrites just below the final freezing temperature, MC carbide and M23C6 carbide were found. It was identified that the script or blocky carbides were Ta or W-rich MC carbide, and the lamellar carbides were Cr-rich M23C6 eutectic carbides. The solid/liquid interface morphology clearly showed that freezing of the Cr-rich eutectic carbide occurred just after the script type MC carbide.

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Shirzadi, A. A., and E. R. Wallach. "Novel Method for Diffusion Bonding Superalloys and Aluminium Alloys (USA Patent 6,669,534 B2, European Patent Pending)." Materials Science Forum 502 (December 2005): 431–36. http://dx.doi.org/10.4028/www.scientific.net/msf.502.431.

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A novel method for diffusion bonding metallic alloys with stable surface oxide films (e.g. nickel and cobalt base superalloys and aluminium alloys) has been developed. The stable oxides on the faying surfaces of these alloys are replaced, prior to the bonding process, with a very thin metallic layer and/or less stable oxides, using a proprietary non-chemical oxide removal method based on the use of gallium. This new method is very rapid and neither requires the use of any sophisticated equipment nor is a costly process. Bonding is then readily achieved by either solid-state or transient-liquid-phase (TLP) diffusion bonding. Using this method, bonds in nickelbase and cobalt-base superalloys with “virtually invisible” bond interfaces and bonds in aluminium alloys with strengths as high as those of the parent alloys can be produced.

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Yuan, Chao, Jian Ting Guo, and Lan Zhang Zhou. "Effect of Nitrogen on Microstructure and Properties of a Cast Cobalt-Base Superalloy." Advanced Materials Research 278 (July 2011): 472–78. http://dx.doi.org/10.4028/www.scientific.net/amr.278.472.

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The effect of the nitrogen on the microstructure and properties of a cast Co-based superalloy K640S was investigated with the different level ranged from 24 ppm to 85 ppm. The results indicate that almost all nitrogen exist in the form of nitride precipitation in the vacuum induction melting. It is found that high N level would extend the solidification window during the solidification process, and then increase the quantity of the carbide eutectic phases and led to the distribution in the network form of the eutectics in the interdendritic regions. High nitrogen content (more than 40 ppm) can reduced the mechanical properties of the testing alloy. So, it is suggested that the nitrogen in the recycled Co-based superalloys should be controlled at a suitable level in order to avoid the degradation of their properties.

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6

Kolb, Markus, Christopher H. Zenk, Anna Kirzinger, Ivan Povstugar, Dierk Raabe, Steffen Neumeier, and Mathias Göken. "Influence of rhenium on γ′-strengthened cobalt-base superalloys." Journal of Materials Research 32, no. 13 (July 2017): 2551–59. http://dx.doi.org/10.1557/jmr.2017.242.

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7

Kvapilová, Marie, Božena Podhorná, Jiri Dvorak, Petr Král, Jiří Zýka, Karel Hrbáček, and Vàclav Sklenička. "Creep Damage Mechanisms in Cast Cobalt Superalloys for Applications in Glass Industry." Key Engineering Materials 774 (August 2018): 173–78. http://dx.doi.org/10.4028/www.scientific.net/kem.774.173.

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Two cast NbC and TaC- strengthened cobalt-base superalloys have been developed for a precision casting of spinner discs for glass wool industry. In the present study, the relationships between the type and morphology of carbides and the degradation processes in both types of cast cobalt-based superalloys subjected to high temperature creep have been examined. It was found that the nature of carbides within the alloy microstructure plays a critical role in determining the creep damage processes and microstructure stability of the alloy system under high temperature creep. The morphology of the carbides is a strong function of their chemical composition. The interface decohesion between the complex carbides and the matrix and cracking of the brittle carbides homogeneously distributed in the crept NbC - strengthened alloy lead to brittle intergranular and/or interdendritic fracture. By contrast, Ta - strengthened alloy exhibited very small extent of isolated creep damage and the final fracture is ductile transgranular mode.

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8

Shahriary, M. S., Y. Miladi Gorji, and A. M. Kolagar. "Gas metal arc welding in refurbishment of cobalt base superalloys." IOP Conference Series: Materials Science and Engineering 164 (January 2017): 012016. http://dx.doi.org/10.1088/1757-899x/164/1/012016.

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9

Berthod, Patrice, Jean-Paul Gomis, Lionel Aranda, and Pierre-Jean Panteix. "Thermal Expansion and Microstructure Behavior at Elevated Temperature of various {Ni, Co}-based Cast Superalloys." Academic Journal of Chemistry, no. 53 (March 25, 2020): 17–24. http://dx.doi.org/10.32861/ajc.53.17.24.

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This paper aims to investigate the thermal expansion behavior, up to an elevated temperature, of superalloys based on nickel and cobalt with various proportions and designed to be strengthened by tantalum carbides. The as-cast microstructures of these superalloys and their evolutions at two very high temperatures were also of interest. All results are discussed by considering the Ni/Co repartition in the base element position. It appears that when the Ni content is higher than the Co one: 1/the thermal expansion is slower, 2/the as-cast microstructures as well as the ones stabilized at high temperature contain not only TaC but also chromium carbides, and 3/the hardness in as-cast or aged state is lower.

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Coedo, A. Gómez, M. T. Dorado López, and A. Vindel Maeso. "Inductively coupled plasma atomic emission spectrometric analysis of cobalt-base superalloys." J. Anal. At. Spectrom. 2, no. 6 (1987): 629–35. http://dx.doi.org/10.1039/ja9870200629.

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Dissertations / Theses on the topic "Cobalt base superalloys"

1

Reynolds, Gary James. "Damage rate approaches for nickel-base superalloys." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/18863.

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Meher, 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/.

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The increasing technological need to push service conditions of structural materials to higher temperatures has motivated the development of several alloy systems. Among them, superalloys are an excellent candidate for high temperature applications because of their ability to form coherent ordered precipitates, which enable the retention of high strength close to their melting temperature. The accelerated kinetics of solute diffusion, with or without an added component of mechanical stress, leads to coarsening of the precipitates, and results in microstructural degradation, limiting the durability of the materials. Hence, the coarsening of precipitates has been a classical research problem for these alloys in service. The prolonged hunt for an alternative of nickel base superalloys with superior traits has gained hope after the recent discovery of Co-Al-W based alloys, which readily form high temperature g precipitates, similar to Ni base superalloys. In the present study, coarsening behavior of g precipitates in Co-10Al-10W (at. %) has been carried out at 800°C and 900°C. This study has, for the first time, obtained critical coarsening parameters in cobalt-base alloys. Apart from this, it has incorporated atomic scale compositional information across the g/g interfaces into classical Cahn-Hilliard model for a better model of coarsening kinetics. The coarsening study of g precipitates in Ni-14Al-7 Cr (at. %) has shown the importance of temporal evolution of the compositional width of the g/g interfaces to the coarsening kinetics of g precipitates. This study has introduced a novel, reproducible characterization method of crystallographic study of ordered phase by coupling of orientation microscopy with atom probe tomography (APT). Along with the detailed analysis of field evaporation behaviors of Ni and Co superalloys in APT, the present study determines the site occupancy of various solutes within ordered g precipitates in both Ni and Co superalloys. This study has explained the role of structural and compositional gradients across the precipitates (g)/matrix (g) interfaces on the coarsening behavior of coherent precipitates in both Ni and Co-base superalloys. The observation of two interfacial widths, one corresponding to a structural order-disorder transition, and the other to the compositional transition across the interface, raises fundamental questions regarding the definition of the interfacial width in such systems. The comparative interface analysis in Co and Ni superalloy shows significant differences, which gives insights to the coarsening behaviors of g precipitates in these alloys. Hence, the principal goal of this work is to compare and contrast the Co and Ni superalloys and also, to accommodate atomic scale information related to transitions across interfaces to coarsening models for a better practical applicability of coarsening laws to various alloys.

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Léglise, 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.

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Les assiettes de fibrage utilisées pour la production de fibres de verre subissent d’importantes contraintes mécaniques, chimiques et thermiques. Par conséquent, cette pièce se dégrade et doit être périodiquement remplacée. Le but de ces travaux est d’augmenter la durée de vie des assiettes de fibrage en améliorant les propriétés mécaniques et chimiques des superalliages qui les constituent. Plus précisément, l’objectif de cette thèse est, dans un premier temps, d’améliorer les alliages utilisés pour le fibrage à 1000°C, puis dans un second temps, de trouver un superalliage pouvant fibrer à 1125°C. Ces travaux ont été menés sur deux familles de superalliages : base nickel et base cobalt. Les propriétés chimiques ont été caractérisées par des essais thermogravimétriques et les propriétés mécaniques par des essais de fluage flexion 3 points. Pour l’alliage base Ni, l’influence des éléments minoritaires subis, Mn et Si, a été étudiée. Les propriétés mécaniques de cet alliage ont fait, ensuite, l’objet d’essais d’amélioration par l’addition de titane, zirconium, tantale, hafnium et de niobium. L’addition d’aluminium a été aussi expérimentée mais ayant pour but d’améliorer les propriétés chimiques de l’alliage. Enfin, des études ont été aussi menées sur l’addition de métaux nobles (Pd et Ru) et de terres rares (Y, La et Ce). Concernant les superalliages base cobalt, l’étude s’est portée sur un alliage base Co qui a antérieurement montré de bonnes propriétés générales pour une utilisation à 1125°C et non à 1000°C. Des variantes avec une teneur abaissée en tantale, sans hafnium et sans tungstène ont été étudiées. Pour clore ces travaux, l’augmentation de la teneur en nickel et un traitement thermique ont été étudiés afin d’améliorer la résistance à l’oxydation de ce second alliage
The 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

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4

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.

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5

Salgado, 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/.

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Os objetivos deste trabalho foram processar e caracterizar microestrutural e mecanicamente superligas à base de cobalto do sistema Co-Al-W-Ni-Cr-(Nb,Ta)- C-B com microestrutura ?/?\'. Visando possível aplicação em ferramenta para Soldagem por Atrito com Pino Não Consumível (SAPNC), em inglês Friction Stir Welding (FSW) nas composições: (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 além da liga patenteada (Co-10Al-7,5W-40Ni-10Cr-3,0Ta-0,6C-0,06B %at.) - 40Ni-3Ta considerada padrão para este projeto. A caraterização microestrutural foi feita por microscopia eletrônica de varredura (MEV), microscopia eletrônica de varredura por emissão de campo (MEV-FEG), medidas de microanálise semi-quantitativa e mapeamento químico por EDS, caracterização por difração de raios X, além do ensaio mecânico de dureza Vickers em todas as amostras. Os resultados da caracterização microestrutural e mecânica para a liga 40Ni-3Ta mostraram-se semelhantes aos encontrados na literatura enquanto que a composição 40Ni-3Nb foi a que apresentou resultados mais próximos em relação à liga padrão.
The 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.

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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.

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7

Huron, 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.

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8

Dupin, Nathalie. "Contribution à l’évaluation thermodynamique des alliages polyconstitués à base de nickel." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0040.

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La coexistence des phases gamma de structure cubique a faces centrees a1 et gamma' de structure cubique a faces centrees l1#2 confere aux superalliages base nickel leurs exceptionnelles proprietes mecaniques a hautes temperatures. Des calculs thermodynamiques bases sur l'evaluation des systemes simples constitutifs de ces alliages complexes, contenant au moins huit elements, peuvent permettre de reduire le nombre d'experimentations a entreprendre pour optimiser leur compositions et les traitements thermiques associes. Dans ce but, ce travail presente l'etude thermodynamique des phases constituant les systemes quaternaires al-cr-ni-ta et al-cr-ni-ti. La premiere partie presente les modeles adaptes a la description du comportement thermodynamique des phases intermetalliques etudiees. La presentation du modele en sous-reseaux est particulierement detaillee. Les contraintes necessaires a la description des phases a1 et l1#2 par une meme expression mathematique sont derivees a partir de l'identification des modeles a deux et quatre sous-reseaux de la phase l1#2. Les chapitres suivants analysent les systemes binaires al-co, al-ni, cr-ta et ternaires al-co-ni, al-cr-ni, al-ni-ti, al-ni-ta, cr-ni-ta et cr-ni-ti. Les parametres thermodynamiques decrivant les phases constituant ces systemes sont obtenus dans un processus d'optimisation prenant en compte l'ensemble des donnees experimentales, souvent rares, publiees sur ces systemes. L'extension des parametres thermodynamiques ainsi determines aux systemes quaternaires al-cr-ni-ta et al-cr-ni-ti sans optimisation supplementaire justifie la demarche entreprise. Une base thermodynamique permettant le calcul des equilibres de phases dans les superalliages base nickel a donc ainsi ete constituee

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9

Ur-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.

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[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.

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Books on the topic "Cobalt base superalloys"

1

P, Gabb T., Miner R. V, and United States. National Aeronautics and Space Administration., eds. Fatique crack propagation of nickel-base superalloys at 650 C. [Washington, D.C.]: National Aeronautics and Space Administration, 1985.

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P, Gabb Timothy, Miner R. V, and United States. National Aeronautics and Space Administration., eds. Fatique crack propagation of nickel-base superalloys at 650 ̊C. [Washington, D.C.]: National Aeronautics and Space Administration, 1985.

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A, Barrett Charles, and United States. National Aeronautics and Space Administration., eds. The effect of Cr, Co, Al, Mo, and Ta on a series of cast Ni-base superalloys on the stability of an aluminide coating during cyclic oxidation in Mach 0.3 burner rig. [Washington, D.C.]: National Aeronautics and Space Administration, 1986.

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Sreeramesh, Kalluri, U.S. Army Research Laboratory., and United States. National Aeronautics and Space Administration., eds. Cyclic axial-torsional deformation behavior of a cobalt-base superalloy. [Washington, DC: National Aeronautics and Space Administration, 1992.

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Sreeramesh, Kalluri, U.S. Army Research Laboratory., and United States. National Aeronautics and Space Administration., eds. Cyclic axial-torsional deformation behavior of a cobalt-base superalloy. [Washington, DC: National Aeronautics and Space Administration, 1992.

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Sreeramesh, Kalluri, U.S. Army Research Laboratory., and United States. National Aeronautics and Space Administration., eds. Cyclic axial-torsional deformation behavior of a cobalt-base superalloy. [Washington, DC: National Aeronautics and Space Administration, 1992.

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Sreeramesh, Kalluri, U.S. Army Research Laboratory., and United States. National Aeronautics and Space Administration., eds. Cyclic axial-torsional deformation behavior of a cobalt-base superalloy. [Washington, DC: National Aeronautics and Space Administration, 1992.

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United States. National Aeronautics and Space Administration., ed. Yielding and deformation behavior of the single crystal nickel-base superalloy PWA 1480. [Washington, DC]: National Aeronautics and Space Administration, 1986.

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M, Vijayakumar, Tewari S. N. 1936-, and United States. National Aeronautics and Space Administration., eds. Calibration approach to electron probe microanalysis: A study with PWA-1480, a nickel base superalloy. [Washington, DC]: National Aeronautics and Space Administration, 1990.

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C, Wilcox Roy, and United States. National Aeronautics and Space Administration., eds. Determination of cleavage planes and fracture characterization of Ni-based single crystal superalloys: Final progress report. Auburn, AL: Dept. of Mechanical Engineering, Auburn University, 1992.

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Book chapters on the topic "Cobalt base superalloys"

1

Zenk, C. H., S. Neumeier, M. Kolb, N. Volz, S. G. Fries, O. Dolotko, I. Povstugar, D. Raabe, and M. Göken. "The Role of the Base Element in γ′ Strengthened Cobalt/Nickel-Base Superalloys." In Superalloys 2016, 969–80. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119075646.ch103.

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Titus, Michael S., Akane Suzuki, and Tresa M. Pollock. "High Temperature Creep of New L12 Containing Cobalt-Base Superalloys." In Superalloys 2012, 823–32. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118516430.ch91.

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Bauer, Alexander, Steffen Neumeier, Florian Pyczak, and Mathias Göken. "Creep Strength and Microstructure of Polycrystalline γ′ - Strengthened Cobalt-Base Superalloys." In Superalloys 2012, 695–703. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118516430.ch77.

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Gu, Y. F., T. Osada, T. Yokokawa, H. Harada, J. Fujioka, D. Nagahama, and M. Okuno. "Development of Nickel-Cobalt Base P/M Superalloys for Disk Applications." In Superalloys 2016, 209–16. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119075646.ch23.

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Xu, Wei-Wei. "Overview of the Development of L12 γ′-Strengthened Cobalt-Base Superalloys." In Advanced Multicomponent Alloys, 155–75. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4743-8_7.

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Stewart, C. A., R. K. Rhein, A. Suzuki, T. M. Pollock, and C. G. Levi. "Oxide Scale Formation in Novel γ-γ′ Cobalt-Based Alloys." In Superalloys 2016, 991–99. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119075646.ch105.

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Kvapilova, Marie, Petr Kral, Jiri Dvorak, and Vaclav Sklenicka. "Creep Fracture Ductility of Cobalt-Based Superalloys." In Structural Integrity, 184–89. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-91989-8_41.

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Jithesh, K., M. Arivarasu, and M. Nageswara Rao. "Studies on Oxidation Behaviour of Cobalt-Based Superalloy 605." In Lecture Notes in Mechanical Engineering, 155–63. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0909-1_16.

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Del Puglia, A., F. Betti, E. Giorni, F. Pratesi, and G. Zonfrillo. "Low-Cycle and Bithermal Fatigue of a Cobalt-Base Superalloy." In Materials for Advanced Power Engineering 1994, 919–28. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1048-8_73.

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Benson, Michael L., A. D. Stoica, Peter K. Liaw, Hahn Choo, T. A. Saleh, X. L. Wang, Donald W. Brown, and Dwaine L. Klarstrom. "Intergranular Strain and Phase Transformation in a Cobalt-Based Superalloy." In Materials Science Forum, 893–98. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-414-6.893.

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Conference papers on the topic "Cobalt base superalloys"

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Titus, M., A. Suzuki, and T. Pollock. "High Temperature Creep of New L12 Containing Cobalt-base Superalloys." In Superalloys. John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.7449/2012/superalloys_2012_823_832.

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Dolotko, O., S. Fries, M. Göken, M. Kolb, S. Neumeier, I. Povstugar, D. Raabe, N. Volz, and C. Zenk. "The Role of the Base Element in ?' Strengthened Cobalt/Nickel-base Superalloys." In Superalloys 2016. The Minerals, Metals & Materials Society, 2016. http://dx.doi.org/10.7449/superalloys/2016/superalloys_2016_971_980.

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Bauer, A., S. Neumeier, F. Pyczak, and M. Göken. "Creep Strength and Microstructure of Polycrystalline γ' - Strengthened Cobalt-base Superalloys." In Superalloys. John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.7449/2012/superalloys_2012_695_703.

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Fujioka, J., Y. Gu, H. Harada, T. Osada, and T. Yokokawa. "Development of Nickel-Cobalt Base P/M Superalloys for Disk Applications." In Superalloys 2016. The Minerals, Metals & Materials Society, 2016. http://dx.doi.org/10.7449/superalloys/2016/superalloys_2016_209_216.

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Levi, C., T. Pollock, R. Rhein, C. Stewart, and A. Suzuki. "Oxide Scale Formation in Novel ?-?' Cobalt-Based Alloys." In Superalloys 2016. The Minerals, Metals & Materials Society, 2016. http://dx.doi.org/10.7449/superalloys/2016/superalloys_2016_991_999.

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Waldorf, Daniel, Scott Liu, Michael Stender, and Daniel Norgan. "Alternative Binder Carbide Tools for Machining Superalloys." In ASME 2008 International Manufacturing Science and Engineering Conference collocated with the 3rd JSME/ASME International Conference on Materials and Processing. ASMEDC, 2008. http://dx.doi.org/10.1115/msec_icmp2008-72369.

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This study examines the performance of a new class of wear-resistant but economical cutting tools produced by varying the binder composition of standard cemented carbide composites. By replacing some or all of the cobalt binder with rhenium and nickel-based superalloy, a stronger composite tool results, potentially capable of machining heat-resistant superalloys at significantly higher cutting speeds. Sample tools with alternative binder were produced and compared to standard tools bound with cobalt only. Turning experiments on Inconel 718 were run to evaluate wear resistance and tool life for several grades. The experimentation also examined the effects of varying the relative proportions of each binder constituent as well as the overall binder percentage in the composite. Results show a clear advantage of the alternative binder tools as evidenced by a 150% increase in tool life or the equivalent of an 18% increase in cutting speed. Although increasing amounts of rhenium in the binder show a positive effect on performance, the effects of superalloy and overall binder % are inconclusive.

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Girardot, J., M. Schneider, L. Berthe, and V. Favier. "Delamination induced by laser drilling on a base cobalt superalloy." In ICALEO® 2012: 31st International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2012. http://dx.doi.org/10.2351/1.5062405.

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Greaves, Wayne, and Hans van Esch. "High Temperature Brazing for Cobalt-Based Gas Turbine Components." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0337.

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A unique high temperature brazing process was developed for crack repair and surface restoration of cobalt superalloy components of industrial gas turbines. The repair method begins with a special cleaning operation consisting of both chemical and ultrahigh vacuum processes. A new high-temperature braze material, with a composition compatible with most of the common cobalt-based turbine alloys, was developed. The mechanical properties and weldability of the brazed material are comparable with those base alloys. Microstructural evaluation and mechanical testing confirmed the desired properties. Also, actual refurbishment applications of General Electric, Westinghouse, and ABB gas turbine components are shown.

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Pochet, Louis F., and Alfred L. Clavel. "The HF “Fluoride-Ion” Cleaning Technique for Superalloys." In ASME 1987 International Gas Turbine Conference and Exhibition. American Society of Mechanical Engineers, 1987. http://dx.doi.org/10.1115/87-gt-60.

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Fluoride-ion cleaning, using Hydrogen Fluoride gas as the active agent, is rapidly becoming established as a cost effective method to prepare nickel and cobalt based superalloys for braze repair. Background and comparative information on the four basic processes currently in use are discussed. The latest process using hydrogen fluoride gas directly is described in detail including the methods used for precise process control and safe handling of the HF input gas, as well as the off-gas fluoride compounds. Alloys successfully prepared for braze repair are listed. Other uses for the process and potential uses for the manufacture of new components are suggested.

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Sato, M., Y. Kobayashi, H. Matsuzaki, K. Shimomura, T. Shibata, S. Nakamura, Y. Fukui, and K. Wada. "Development of a Cobalt Base Superalloy for Heavy Duty Gas Turbine Nozzles." In ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-390.

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This paper describes an improvement in creep strength and thermal fatigue and hot corrosion resistance of a cobalt base superalloy developed for the applications of heavy duty gas turbine nozzles. The developed alloy has superior resistance to creep, thermal fatigue and hot corrosion over that of conventional alloys. The optimization of alloying elements which improve the creep properties and restrain the coarsening of carbides is discussed. A reduction in the volume fraction of eutectic carbides promoted the prevention of fast thermal fatigue cracking and also increased the hot corrosion resistance of the developed alloy. The mechanical properties were evaluated by general method for gas turbine materials. Thermal fatigue property was examined by introducing cyclic thermal stress into test pieces. During the test, crack propagation of the test pieces was observed. Hot corrosion resistance was evaluated by molten salt corrosion tests. After tests, mass loss of specimens was measured and penetration depth of sulfidized scale was observed. The developed alloy showed good properties which can allow a wide temperature margin for high temperature gas turbine nozzle designing. The developed alloy can be applicable to other gas turbine hot sections. Application of the developed alloy could realize an increase in gas firing temperature or extension of lifetime for current conditions.

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Reports on the topic "Cobalt base superalloys"

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Dunand, David C., David N. Seidman, Christopher Wolverton, James E. Saal, Peter J. Bocchini, and Daniel J. Sauza. Designing Nanoscale Precipitates in Novel Cobalt-based Superalloys to Improve Creep Resistance and Operating Temperature. Office of Scientific and Technical Information (OSTI), October 2014. http://dx.doi.org/10.2172/1242420.

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