316奥氏体不锈钢渗N/镀CrN复合改性层组织与性能

Microstructure and performance of 316 austenitic stainless steel modified compositely by means of ion nitriding/CrN coating

分别在400、440、480℃下对316奥氏体不锈钢进行12 h的渗氮处理,再对渗氮后的试样进行物理气相沉积(PVD)镀CrN薄膜.采用扫描电镜(SEM)、光学显微镜(OM)、X射线衍射仪(XRD)、维氏显微硬度计和材料表面综合测试仪(HSR-2M)、电化学工作站等对复合改性层的表面形貌、截面形貌、成分、显微硬度、耐磨性以及耐蚀性进行测试.结果表明:400℃离子渗N/镀CrN试样耐磨性最差,耐蚀性最好;而480℃离子渗N/镀CrN试样耐磨性最好,耐蚀性最差;但比相同温度下单独渗氮试样的综合性能好.

315 austenitic stainless steel was nitrided respectively at 400,440,and 480℃for 12 h,and then the physical vapour deposition(PVD)and CrN film coating were carried out for the nitrided samples.The surface morphology,cross-section morphology,composition,microhardness,wear resistance,and corrosion resistance of the compositely modifying layer were tested by means of scanning electron microscope(SEM),optical microscope(OM)and X-ray diffractometer(XRD),Vickers hardness tester,material surface tester(HSR-2M),and electrochemical workstation.The result showed that the sample with ion nitriding at 400℃/CrN film coating would exhibit the best corrosion resistance and the worst wear resistance;the sample with ion nitriding at 480℃/CrN film coating would have the worst corrosion resistance and the best wear resistance,but its performance would better than that of a sample nitrided only at the same temperature.