Question

how does hot and cold working affect work hardening?

Answer 1

Work Hardening process have three major aim-

• controlling the grain size (reducing continuity of atomic planes)
• strain hardening (creating and tangling dislocations)
• alloying (introducing point defects and more grains to pin dislocation)

1. Controlling the grain growth by hot working effect because above the recrystallization temp required for new grain growth.
2. Strain hardening (also called work-hardening or cold-working) is the process of making a metal harder and stronger through plastic deformation. When a metal is plastically deformed, dislocations move and additional dislocations are generated. The more dislocations within a material, the more they will interact and become pinned or tangled. This will result in a decrease in the mobility of the dislocations and a strengthening of the material. This type of strengthening is commonly called cold-working.