austenitizing

例句：

1. 1. The steel was austenitized before being machined.
   钢材在加工前进行了退火处理。
2. 2. The metal is tempered to improve its strength and toughness.
   这种金属经过回火以提高其强度和韧性。
3. 3. Austenitization is an important process in the manufacture of steel products.
   退火是钢铁产品制造过程中的一个重要过程。