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Lower bainite is formed at ___________ temperature range.

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Lower bainite is formed at ___________ temperature range.

(a) 750-550^oC

(b) 550-350^oC

(c) 350-250^oC

(d) 250-150^oC

The question was posed to me by my college director while I was bunking the class.

The doubt is from Transformation Diagrams in portion Heat Treatment of Engineering Material & Metallurgy

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Right choice is (c) 350-250^oC

Easy explanation: For eutectoid steels, bainite exists in two forms known as upper and lower bainite. Upper bainite is formed by the isothermal transformation between 550-350^oC. Lower bainite is formed between 350-250^oC which has much finer cementite particles.

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