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。
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.
灰口铸铁、球墨铸铁的辉光离子氮化质量较难保证，其根本原因在于氮化前工件清洗不当。
It is difficult to warrant the quality of glow-ion nitriding to grey cast iron and ductile cast iron. The basic reason is that the iron can't be washed clearly before nitriding.
球墨铸铁曲轴未经过氮化处理，表面疲劳强度低是导致曲轴断裂的原因；
Nodular cast iron crank shaft which has not been processed by adding nitrogen, its surface fatigue strength is lower, this is the reason that results in the fracture.
合金铸铁缸套中的硬质相主要为磷共晶和合金碳化物、氮化物等。
The hard phases in alloy cast irons are mainly phosphor eutectics, alloy carbide and alloy nitride according to different component of the cylinders.
合金铸铁缸套中的硬质相主要为磷共晶和合金碳化物、氮化物等。
The hard phases in alloy cast irons are mainly phosphor eutectics, alloy carbide and alloy nitride according to different component of the cylinders.
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