Why is the mechanical properties of metal materials processed by hot working better than that of casting?
This leads to different parts of the casting properties and processing properties of different materials, and even material composition segregation, some instability will continue to change with time, at the same time in the process of solidification of internal residual stress will produce parts.
Casting parts are usually affected by cooling conditions, cooling rate, structural shape, wall thickness and other factors in the cooling process. The solidification speed of different parts will be different, so the solidification structure of different parts is different
After heat treatment, too large crystallization can be refined, unstable tissue can be transformed into stable tissue, residual stress can be eliminated or alleviated. Therefore, the overall mechanical properties of the material or parts will be improved after heat treatment.
