316奥氏体不锈钢渗N/镀CrN复合改性层组织与性能

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.

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

315 austenitic stainless steel was nitrided respectively at 400, 440, and 480 ℃ for 12 h, and then the physicalvapour 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.