Ring gear material 50Mn heat treatment, conditioning is shrink or rise?
Is up. Because the 50Mn before heat treatment is ferrite = pearlite, and after heat treatment is martensite (including tempered martensite), the specific volume of martensite is larger than ferrite and pearlite (surface oxidation does not count).
It also has something to do with the shape and size of the parts. It's better to do experiments.
Specific methods in the process of heating and cooling of heat treatment. It's a synthetic phenomenon. The final shrinkage is determined by the specific heat treatment process parameters and the quenching medium. Due to the stress, the hole may be swollen.
