35CrMoCe稀土钢离子硫氮碳复合渗特性研究

A Study on the Characteristics or Plasma Sulphur-nitrocarburising of Rare Earth Steel 35CrMoCe

采用金相显微镜、Ｘ射线衍射仪、透射电子显微镜、扫描电子显微镜等仪器分析对比３５ＣｒＭｏ钢和３５ＣｒＭｏＣｅ钢离子硫氮碳复合渗特性，探讨了稀土柿加速离子硫氮碳复合渗的原因。研究结果表明，两种钢的复合渗层均由硫化物层、氮碳化物层和扩散层构成；稀土铈显著地提高了渗层深度；铈具有细化组织的作用，提供了更多可供氮碳原子扩散的通道。

With the help of optical microscopy,X-ray diffraction, transmission electron microscopy (TEM ), and scanning electron microscopy (SME ), the characteristics of plasma sulphur-nitrocarburised 35CrMo and 35CrMOCe steels were compared and analysed. The mechanism that rare earth element, Ce, enhanced the rate of the process was discussed. The treated cases of both steels consist of a sulphide zone,a carbonitride zone, and a diffusion zone of nitrogen and carbon. The rare earth element, Ce,significantly made the treated case deeper, refined the structure, and provided more pipes for the diffusion of nitrogen and carbon atoms. The deeper treated case of 35CrMoCe steel can be used for reducing friction and wear of machine parts under heavy loads.