cold work hardening

例句：

1. 1. The steel is undergoing cold working to improve its strength.
   钢材正在经历冷加工以提高其强度。
2. 2. This process involves cold working and heat treating the metal.
   这个过程包括对金属进行冷加工和热处理。
3. 3. Cold working is a common method used in manufacturing to achieve desired properties.
   冷加工是一种常用的制造方法，用于实现所需的性能。