Explanation

A heat treatment process in which the cold deformed metal is heated to a temperature higher than that of recrystallization for an appropriate period of time. Its purpose is to make the work hardening metal produced by cold work nucleate and grow up again through recrystallization to become small equiaxed grains with invisible change and energy storage, thus eliminating work hardening. Restore its cold working deformability. The temperature of a metal mainly depends on the degree of cold deformation. The smaller the degree of cold deformation, the lower the deformation energy storage in the metal, the smaller the driving force of recrystallization, and therefore the higher the recrystallization temperature. The second phase and solute atoms contained in the metal have the effect of hindering grain boundary migration, so they generally raise the recrystallization temperature. The coarse original grain of metal can also slightly increase the recrystallization temperature. Because there are many factors affecting the recrystallization temperature, the temperature of recrystallization annealing is usually 100-150 ° C higher than the theoretical recrystallization temperature.

Classification