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Question

________structure has maximum hardness.

A.

Troostile

B.

Pearlite

C.

Martensite     

D.

Sorbite

Answer ( Option C)

Martensite     

Solution

●Martensite is formed in carbon steel by the rapid cooling of the austenite form of iron at such a high rate that carbon atoms do not have time to diffuse out of crystal structure in large enough quantities to form cementite.

●Martensite formation is shown in TTT diagram

Hence, the correct option is (C).

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