Microstructural stability and mechanical behavior of a Co–20Ni–7Al–7W–4Ti at.% superalloy

Li, Chunan; Chung, Ding Wen; Dunand, David C.; Seidman, David N.

doi:10.1016/j.jallcom.2020.156378

Cited by 5 publications

(1 citation statement)

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“…Titanium may be also considered for this role. Ti is often present in many superalloys, based on nickel [8,9] as well as on cobalt [10,11] and its role in the oxidation behaviour at high temperature of the concerned alloys can be important [12]. In presence of c arbon, titanium may lead to the formation of TiC carbides in nickel-based superalloys [13][14][15] as well as in cobalt-based superalloys [16].…”

Section: Introductionmentioning

confidence: 99%

Influence of Ti on the oxidation behaviour at 1250°C of chromia-forming alloys based on nickel and/or cobalt

Berthod

Wora

2023

Corrosion Engineering, Science and Technology

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Six {Ni,Co}-based alloys containing 25wt-%Cr, 0.4wt-%C and 1.6wt-%Ti were cast and subjected to metallographic characterisation before and after exposure for 70 h in air at 1250°C, the highest temperature at which these alloys may be used under low applied stresses. The alloys based mainly on nickel contain principally chromium carbides while TiC is the principal carbide phase in the alloys mainly based on cobalt. The oxidation resistance is the best for the alloys richer in nickel than in cobalt, but titanium has the same effect for all alloys, whatever the base element: after oxidation it is present as an external TiO 2 layer covering chromia. The presence of this outermost more (Ni-based alloys) or less thick (Co-based alloys) TiO 2 scale on the outer face of the external chromia scale, is expected to have a protective role against chromia volatilisation, phenomenon which can be very important at so high temperature.

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