repeated tempering

• 多次回火,反复回火

repeated tempering的用法和样例：

例句

1. All heat treatment by quenching and tempering.
   所有萃取和回火的热处理方法。
2. With increasing tempering temperature, the retained austenite decreases.
   回火温度升高，其残余奥氏体量逐渐减少。