目的 提高奥氏体不锈钢的硬度、抗磨损性能。方法 利用弧光离子源耦合轴向磁场，对奥氏体不锈钢表面进行等离子体渗氮处理。通过场发射扫描电子显微镜对渗氮层表面形貌及厚度进行分析。利用球盘式摩擦磨损试验机、维氏显微硬度测试仪对渗氮试样的耐磨损性能及硬度进行分析。使用X射线衍射仪、X射线光电子能谱仪对渗氮层表面的相结构及成分进行分析。结果 当磁场强度低于80 Gs时，渗氮层主要以扩张奥氏体相（γN相）为主。随着磁场强度的增加，渗氮层中逐渐析出铁氮化物及氮化铬相，渗氮层厚度出现增加—减小—增加的变化趋势；渗氮层表面显微硬度先增加，当磁场强度为80 Gs时达到最大值1100 HV0.05，而后略有降低。与未渗氮样品相比，渗氮样品的磨损率明显降低，磁场强度为80 Gs的样品磨损率达到最低值。结论 弧光离子源耦合到轴向磁场后，不仅大大提高了渗氮效率，对渗氮样品的表面显微硬度及耐磨性也都有明显提高。

This present work aims to improve the hardness and wear resistance of austenitic stainless steels. The plasma ni-triding treatment of the austenitic stainless steel surface was performed by arc discharge ion source coupled with axial magnetic field. The surface morphology and thickness of nitrided layer were analyzed by field emission scanning electron microscope. The wear resistance and hardness of nitrided specimens were investigated by ball-disk friction wear tester and Vickers microhardness tester. X-ray diffractometer and X-ray photoelectron spectrometer were used to analyze the phase structure and composition of nitrided layer. When the magnetic field intensity was lower than 80 Gauss, the nitriding layer was mainly composed of an expanded austenite phase (γN phase). With the increase of the magnetic field intensity, iron nitride and chromium nitride phase gradually precipitated in the nitrided layer and the thickness of the nitrided layer firstly increased and then decreased and finally increased. With the increase of the magnetic field intensity, the microhardness of the surface of the nitrided layer firstly increased and then slightly decreased when the intensity reached the maximum value of 1100HV0.05. Compared with the non-nitrided sample, the wear rate of the nitrided sample was significantly reduced and the lowest wear rate was obtained at a magnetic field intensity of 80 Gauss. After the axial magnetic field is coupled with the arc discharge ion source, the nitriding efficiency is greatly improved and the surface microhardness and wear resistance of the nitrided samples also increase.