Question

Cold working of a material... a) Is conducted at room temperature. b) Is conducted inside a refrigerator. c) Is conducted below the recrystallisation temperature. d) Is conducted above the recrystallisation temperature

Answer 1

Answer:

The answer is:

c) Is conducted below the recrystallisation temperature

Explanation:

In cold working the metal goes through a process of plastic deformation that is conducted below its recrystallization point (which its usually at room temperature), this in order to change permanently the makeup of its crystals. The temperature at which the process happens is low enough so that atoms cannot rearrange themselves.

The resulting metal is more resistant to deformation, and has an increased hardness and tensile strength.