heat treatment annealing

1. Definition: A heat treatment process in which the metal or alloy whose structure deviates from the equilibrium state is heated to an appropriate temperature, kept for a certain period of time, and then slowly cooled to achieve a structure close to the equilibrium state.

2. Purpose: Reduce hardness, uniform chemical composition, improve machinability and cold plastic deformation performance, eliminate or reduce internal stress, and prepare suitable internal structure for final heat treatment of parts.

3. Classification

Spheroidizing Annealing: Annealing performed to spheroidize the carbides in the workpiece.

Stress relief annealing: Annealing is performed to remove the internal stress caused by plastic deformation processing, cutting processing or welding of the workpiece and the residual stress existing in the casting.