35 CrMo激光熔覆铁基合金与镍基合金涂层性能比较

摘要

In order to study the laser cladding Fe-based and Ni-based alloy coatings on 35CrMo motor spindle, 3540 Fe-based and Ni00 Ni-based modified coating alloy coatings were prepared on the surface of 35CrMo motor spindle with CO2 laser.After the initial satisfaction of engineering applications, hardness of the modified coating materials at a selected cross-section were tested in both the horizontal and vertical direction,while the metallographic properties were studied by applying etching liquids.The results show that near the junction of the cladding zone and the fusion zone, both hardness of the two cladding materials are about 640HV, which meet the engineering application.Both of the two kinds of the coating materials are better than the base material in terms of corrosion resistance.Microstructures are significant different from the laser clad zone to the fusion zone.The grains become smaller and smaller in size and the Ni-based materials is better than Fe-based materials in corrosion resistance.Comprehensive comparison shows that Ni00 cladding material is better than 3540 material in meeting engineering application.%为了对35CrMo电机主轴激光熔覆铁基合金与镍基合金涂层进行对比研究，利用CO2激光在35CrMo电机主轴表面制备3540铁基和Ni00镍基合金改性涂层，在初步满足工程应用的前提下，对两种材料改性涂层横截面横向和纵向上的硬度进行测试，并通过配备腐蚀液对其进行了金相研究。结果表明，在熔覆区和熔合区交界处附近，两种熔覆材料的显微硬度差别不大，均为640 HV左右，都能满足工程应用；两种涂层材料的耐腐蚀性均较基体材料强，激光熔覆区域、熔合区的显微组织差异明显，晶粒的尺寸逐渐变小，且镍基材料的耐腐蚀更强。综合比较而言，选择Ni00熔覆材料较3540材料更能满足工程应用。