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An Overview on Co-Base Alloys for High Temperature Applications

Makineni, SK and Sharma, A and Pandey, A and Chattopadhyay, K (2021) An Overview on Co-Base Alloys for High Temperature Applications. [Book Chapter]

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Official URL: https://doi.org/10.1016/B978-0-12-803581-8.12094-6


The article outlines the evolution, over the last half a century, of Co-base superalloys. Recent developments have led to the emergence of these alloys as a promising alternative to high temperature commercial Ni-base superalloys that are used in fabricating components of gas turbine engines that power passenger/military aircrafts, ships and power plants. The materials used in these engines experience temperatures as high as 1600°C combined with high stresses and corrosive environment often under high pressure. Earlier generations of Co-base alloys have niche applications where resistance to corrosion/oxidation rather than strength is needed as these were primarily strengthened through solid solution and dispersion of carbides and borides. Discovery of γ/γ′ microstructure in Co-base alloys akin to that present in Ni-base superalloys has opened opportunities for developing new classes of high temperature, high strength superalloys. In this review, we first briefly summarize the status of solid solution strengthened Co-base superalloys followed by a review of rapidly evolving Co-based superalloys that are strengthened by the γ′ precipitation in a γ matrix.

Item Type: Book Chapter
Publication: Encyclopedia of Materials: Metals and Alloys
Publisher: Elsevier
Additional Information: The copyright for this article belongs to Elsevier
Keywords: Anti-phase boundaries (APBs)CarbidesCobaltCreep propertiesGrain boundaryHigh temperature strengthMartensitic transformationMass densitySolid solution strengtheningSolvus temperatureStacking fault energyTwinningγ/γ′ lattice misfitγ′ L12 precipitatesγ′ volume fraction
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 22 Nov 2021 10:02
Last Modified: 22 Nov 2021 10:02
URI: http://eprints.iisc.ac.in/id/eprint/70563

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