Grey cast iron of automobile engine body is treated(phase-change hardening) by plasma surface heat treatment.The microstructure and microhardness of grey cast iron was analyzed.

• 采用等离子相变硬化设备对汽车发动机缸体灰铸铁进行了表面相变硬化处理,分析了处理后铸铁的显微组织和硬度特征。