Question

The dislocation density of the material increases during the process of cold rolling or work hardening.

(a) True

(b) False

This question was addressed to me in homework.

This interesting question is from Cold Rolling in portion Mechanical Working of Metals of Casting-Forming-Welding II

Answer 1

The correct option is (a) True

For explanation: In cold rolling or work hardening process, dislocations contact with each other and accept configurations which prevent the movement of other dislocations in the material. During the process, the dislocation density increases, this also makes increase in the flow stress of the material. Flow stress is defined as the instantaneous value of stress required to continue the plastic or permanent deformation.