Studies on the Structure of Hard Chromium Plate

Abstract

The structural changes which take place during the annealing of chromium plate are illustrated by a series of photomicrographs. It is shown that recrystallization can be effected between 300°C (572°F) and 500°C (932°F). Loss of hardness is concurrent with recrystallization. A slight loss of hardness at lower annealing temperatures is ascribed to recovery from internal stress. The basis metal is shown to have an effect on the rate at which a growing electrodeposit assumes the normal preferred orientation.