solution hardening

例句：

1. 1.The steel was solution hardened to increase its strength.
   该钢经过溶液硬化以提高其强度。
2. 2.During the solution hardening process, the material is heated and then quenched.
   在溶液硬化过程中，材料被加热然后淬火。
3. 3. The engineers were tasked with solving the problem of solution hardening.
   工程师们被指派解决溶液硬化问题。