Question

Cold Working is primarily characterized by

• A. Heating the material above its recrystallization temperature
• B. Deforming the material at temperatures below its recrystallization temperature
• C. Adding impurities to the material to strengthen it
• D. Reducing the material's thickness through compression

Hint:

Cold Working vs. Hot Working. Cold Working: Deformation below recrystallization temperature; causes strain hardening (increased strength, decreased ductility). Hot Working: Deformation above recrystallization temperature; avoids strain hardening, allows large deformations.

Answer 1

The Correct Option is B

Cold working refers to the plastic deformation of a metal carried out at a temperature low enough that recrystallization does not occur during the process.
This temperature is typically below the metal's recrystallization temperature (often considered below 0.
3-0.
4 times the absolute melting temperature).
Deforming the material under these conditions leads to strain hardening, where the dislocation density increases, making the material stronger and harder but less ductile.
Option (1) describes hot working.
Option (3) describes alloying or solid solution strengthening.
Option (4) describes a specific deformation process (like rolling) but not the defining characteristic of cold working itself, which is the temperature relative to recrystallization.