quarter-hard annealing

例句：

1. 1. The steel was subjected to a quarter-hard annealing process before being machined.
   在被加工之前，钢材经历了四分之一硬化退火处理。
2. 2.During the manufacturing process, the material undergoes several stages of quarter-hard annealing to achieve optimal properties.
   在制造过程中，材料会经历几个阶段进行四分之一硬化退火，以获得最佳性能。
3. 3. The engineers carefully monitored the temperature during the quarter-hard annealing process to ensure it did not exceed the critical point.
   工程师们仔细监控了退火过程的温度，以确保它没有超过临界点。