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Isothermal transformations of eutectoid steel between 723oC and 550oC produces __________ microstructure.

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Isothermal transformations of eutectoid steel between 723oC and 550oC produces __________ microstructure.

(a) Pearlite

(b) Bainite

(c) Ferrite

(d) Cementite

This question was addressed to me during an interview.

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

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The correct choice is (a) Pearlite

The best I can explain: Isothermal transformations of eutectoid steel between 723^oC and 550^oC bring into being a pearlitic microstructure. The pearlite changes from coarse structure to fine structure as the transformation is decreased in this range.

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