Effect of Laser Power on Microstructure and Properties of Laser Cladding Layer of WC Reinforced Ni35 Alloy
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摘要: 采用不同激光功率（1.1，1.3，1.5 kW）在45钢表面激光熔覆制备WC增强Ni35合金熔覆层，利用光学显微镜、扫描电子显微镜、X射线衍射仪、显微维氏硬度计、摩擦磨损试验机、电化学工作站等研究了激光功率对熔覆层组织与性能的影响。结果表明：随着激光功率增大，熔覆层表面宏观裂纹减少，熔覆层稀释率增大；随着激光功率增大，熔覆层的显微硬度升高，磨损量和摩擦因数减小，不同激光功率熔覆层的耐磨性均优于基体；当激光功率为1.5 kW时，相比于基体，熔覆层的表面平均硬度提高了约270%，磨损量和摩擦因数分别降低了95.2%和54.93%；随着激光功率的增大，熔覆层的自腐蚀电位先减小后增加，自腐蚀电流密度先增大后降低，当激光功率为1.5 kW时，熔覆层的自腐蚀电流密度最小，耐腐蚀性相对较好。Abstract: WC reinforced Ni35 alloy ladding layers were prepared on 45 steel surface by laser cladding at different laser powers (1.1, 1.3, 1.5 kW). The effect of laser power on the microstructure and performance of the cladding layer was studied by optical microscope, scanning electron microscope, X-ray diffractometer, micro Vickers hardness tester, friction and wear testing machine, electrochemical workstation, etc. The results show that with increasing laser power, the macroscopic cracks on the surface of the cladding layer decreased, and the dilution rate of the cladding layer increased. With increasing laser power, the microhardness of the cladding layer increased, and the wear loss and friction factor decreased. The wear resistance of cladding layers with different laser powers was better than that of the matrix. When the laser power was 1.5 kW, the average hardness of the cladding layer surface was increased by 270%, and the wear loss and friction factor was reduced by 95.2% and 54.93%, comparing with that of the matrix. With increasing laser power, the self-corrosion potential of the cladding layer decreased first and then increased, and the self-corrosion current density increased first and then decreased. When the laser power was 1.5 kW, the self-corrosion current density of the cladding layer was the smallest, the corrosion resistance was relatively good.
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