The nitride layer was formed on the surface of ductile cast iron by gas multi-element penetration, and the phase structure and section appearance of nitride layer were analyzed by the XRD and SEM.

• 球墨铸铁经过气体多元共渗后可在其表面形成氮化层,通过X射线衍射和扫描电镜对渗层的相结构与形貌进行分析。