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Which of the following methods of heat treatment is best suitable for treating the output of cold rolling?

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in Casting-Forming-Welding II by (119k points)
Which of the following methods of heat treatment is best suitable for treating the output of cold rolling?

(a) Quenching

(b) Case hardening

(c) Annealing

(d) Cyanide hardening

This question was addressed to me at a job interview.

Query is from Cold Rolling in section Mechanical Working of Metals of Casting-Forming-Welding II

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The correct option is (c) Annealing

The best explanation: The plastic deformation of metal plate in cold rolling includes changing of grain shape, increase in dislocation density and strain hardening of the material. These changes make the metal plate hard and ductile less. So, annealing is a process of heat treatment in which material regains its softness and relieves all its residual stresses.

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