激光功率对熔覆Ni基涂层性能的影响

Effect of Laser Power on Properties of Cladding Ni Based Coatings

为提高45号钢表面硬度和耐磨性,可以在45号钢的表面采用激光熔覆技术熔覆合金涂层提高其表面性能。镍基合金熔覆层硬度高、耐磨、抗腐蚀、抗弯曲、可以在极端环境下具有稳定的性能,但在激光熔覆层中易产生裂纹。为改善45钢表面性能,在相同的扫描速率下采用不同功率在其表面激光熔覆制备了Ni基(Ni60)复合涂层,对不同激光功率熔覆层的性能检测使用金相显微镜、显微硬度仪、扫描电镜。结果表明:随着激光功率的增加,表面粗糙度变大,熔覆层的宽度、高度、基材的熔化深度都有一定程度的增大,裂纹出现趋势减小。在45号钢上熔覆Ni60合金粉末可以提高基材表面显微硬度,熔覆层显微硬度高出基材显微硬度约700HV,激光熔覆技术在一定范围内可以实现对基材的表面硬化。

In order to improve the surface hardness and wear resistance of 45 steel,laser cladding technology can be used on the surface of 45 steel to improve the surface properties of the alloy coating.Nickel based alloy cladding has high hardness,wear resistance,corrosion resistance,bending resistance and stable performance in extreme environments.However,it is easy to crack in the laser cladding layer.In order to improve the surface properties of 45 steel,the surface prepared by laser cladding Ni base with different power in the same scan rate(Ni60)composite coating,the performance testing of different laser power of cladding layer using metallographic microscope,microhardness tester,scanning electron microscope.The results show that the surface roughness increases with the increase of laser power,the width and height of cladding layer and the melting depth of substrate increase to a certain extent,and the crack occurrence trend decreases.The surface microhardness of the substrate can be improved by cladding Ni60 alloy powder on Steel No.45.The microhardness of the cladding layer is higher than that of the substrate,and the microhardness is about 700HV,the surface hardening of substrate can be achieved in a certain range by laser cladding technology.