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Which of the following nickel-based alloys is/are superalloys?

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Which of the following nickel-based alloys is/are superalloys?

(a) Hastelloy C-276

(b) Inconel 718

(c) Hastelloy C-276, Inconel 718 and Hastelloy HX

(d) Hastelloy HX

This question was posed to me in an online interview.

Question is from High Temperature Materials in chapter High Temperature Corrosion of Corrosion Engineering

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Correct option is (c) Hastelloy C-276, Inconel 718 and Hastelloy HX

Easy explanation: Superalloys or high-performance alloys are the alloys that can resist extreme conditions such as high temperature, high stress, high wear, and corrosive atmospheres. Nickel-based alloys are widely used as superalloys that include Hastelloy C-276, Inconel 718, and Hastelloy HX.

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