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Rapid quenching of eutectoid steel ___________ transforms the austenite into martensite.

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Rapid quenching of eutectoid steel ___________ transforms the austenite into martensite.

(a) At room temperature

(b) Below 320^oC

(c) At 550^oC

(d) Above 723^oC

The question was asked by my school teacher while I was bunking the class.

My query is from Transformation Diagrams topic in portion Heat Treatment of Engineering Material & Metallurgy

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Correct choice is (d) Above 723^oC

Explanation: An isothermal transformation of eutectoid steel between 723^oC and 550^oC gives a pearlitic microstructure. Rapid quenching above 723oC transforms the austenitic condition into martensitic condition.

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