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Tempering of martensite steel is done _________

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Tempering of martensite steel is done _________

(a) Below eutectic temperature

(b) Below eutectoid transformation temperature

(c) At room temperature

(d) At 1000^oC

The question was asked in an interview for internship.

Query is from Tempering topic in chapter Heat Treatment of Engineering Material & Metallurgy

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Right answer is (b) Below eutectoid transformation temperature

The explanation is: Tempering is a process of heating martensite steel below the eutectoid transformation temperature (250-650^oC). It is held there for some time and slowly cooled to room temperature.

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