Explanation

The phenomenon of excessive grain growth of metals and alloy due to high temperature during hot working and heat treatment. overheating will reduce the plasticity and toughness of metallic materials, which must be avoided. After overheating occurs to metals and alloy with solid polymorphic phase transformation, recrystallization can occur through reheating and cooling cycles to refine the grains. For metals and alloy without solid polymorphic phase transformation, such as aluminum, magnesium, copper base alloy, and high alloy austenitic steel or ferritic steel, the overheating grain structure can only be eliminated through recrystallization after cold deformation.

Classification