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___________ is a mixture of radial lamellae of ferrite and cementite.

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___________ is a mixture of radial lamellae of ferrite and cementite.

(a) Troostite

(b) Ferrite

(c) Martensite

(d) Sorbite

I had been asked this question in an online quiz.

My question is taken from Iron-Carbon System and their Alloys in section Constitution of Alloys and Phase Diagrams of Engineering Material & Metallurgy

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The correct answer is (a) Troostite

Best explanation: Troostite is a microstructure containing ferrite and finely divided cementite. This is produced by tempering martensite below 450oC. In other words, it is a mixture of radial lamellae of ferrite and cementite.  It differs from pearlite only due to the degree of fineness.

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