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The CCT or the TTT diagrams are used for _________

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The CCT or the TTT diagrams are used for _________

(a) One steel of specific composition

(b) A family of various steels

(c) Alloy system of various compositions

(d) Combination of all alloys and steels with various compositions

I had been asked this question during an interview for a job.

My doubt stems from Transformation Diagrams in section Heat Treatment of Engineering Material & Metallurgy

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Right choice is (a) One steel of specific composition

The best I can explain: An individual equilibrium diagram like the Fe-Fe3C can be used to depict an entire alloy system of various compositions. However, a TTT or a CCT diagram can only be used for one steel of a specified composition.

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