渗氮处理对SLD钢表面CrTiAlN涂层组织与性能的影响

Effect of nitriding treatment on microstructure and properties of CrTiAlN coating on SLD steel surface

采用多弧离子镀在SLD钢表面制备CrTiAlN涂层。利用扫描电镜(SEM)、原子力显微镜(AFM)、X射线衍射仪(XRD)、划痕仪和摩擦磨损试验机等研究渗氮处理对SLD钢表面CrTiAlN涂层的组织结构、力学性能和摩擦磨损性能的影响。结果表明,未经渗氮处理的SLD钢表面CrTiAlN涂层的微凸体较多,CrN相以(200)晶面生长,涂层显微硬度为2423 HV0.01。渗氮后,CrN相以(111)晶面择优生长且晶粒更加细小,涂层显微硬度提升24%,磨损机理以磨粒磨损、黏着磨损为主,磨损率下降。

CrTiAlN coating was deposited on SLD steel surface by multi arc ion plating. The effects of nitriding treatment on microstructure, mechanical properties and friction and wear properties of the CrTiAlN coating on SLD steel surface were investigated by means of scanning electron microscopy(SEM), atomic force microscopy(AFM), X-ray diffraction(XRD), scratch tester and friction and wear tester. The results show that the CrTiAlN coating on the surface of the SLD steel without nitriding treatment has more asperities, the CRN phase grows in(200) crystal plane, and the microhardness of the coating is 2423 HV0.01. After nitriding, the CRN phase grows preferentially on(111) crystal plane and the grains are finer, the microhardness of the CrTiAlN coating increases by 24%, the wear mechanism is mainly abrasive wear and adhesive wear, and the wear rate decreases.