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Question

Steel can be hardened quickly by ________ process.

A.

carburizing

B.

cyaniding

C.

induction hardening

D.

none of these

Answer ( Option C)

induction hardening

Solution

Flame or induction hardening are the processes in which the surface of steel is heated very rapidly to high temperatures then cooled rapidly. This creates a case of martensite on the surface.

Hence, the correct option is (C).    

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