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The first step in constructing a TTT diagram involves _________ the sample.

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The first step in constructing a TTT diagram involves _________ the sample.

(a) Annealing

(b) Normalising

(c) Quenching

(d) Austenising

I got this question during an online interview.

The origin of the question is Transformation Diagrams topic in chapter Heat Treatment of Engineering Material & Metallurgy

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The correct choice is (d) Austenising

To explain I would say: To construct a TTT diagram, a large number of the small specimen are collected and austenised in a furnace. Next, heat treatment and quenching stages are carried out. After each stage, the temperature and time are plotted as curves.

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