利用激光熔覆技术, 在45#钢表面制备(B2O3+WO3+C)镍基熔覆层。利用扫描电子显微镜分析了熔覆层的显微组织, 利用显微硬度仪测试了熔覆层的显微硬度。试验结果表明: 激光功率和(B2O3+WO3+C)粉末含量对熔覆层的显微硬度均有明显影响。在激光功率1.8 kW、(B2O3+WO3+C)粉末含量15%、扫描速度2 mm/s和离焦量50 mm条件下, 熔覆层平均显微硬度高达HV0.31300, 是基材平均显微硬度的约6.5倍, 大大提高了熔覆层的硬度和耐磨性。

The (B2O3+WO3+C) Ni-based cladding layer has been prepared successfully by laser cladding on steel 45# substrate. The microstructure of the cladding layer was analyzed by scanning electron microscope, and the microhardness of the cladding layer was measured by microhardness meter. The result shows that laser power and(B2O3+WO3+C)powder content have a significant effect on the microhardness of the cladding layer. At a laser power of 1.8 kW, (B2O3+WO3+C) powder content of 15%, scanning speed of 2 mm/s and defocusing of 50 mm, the average microhardness of the cladding layer is as high as HV0.31300, which is about 6.5 times the average microhardness of the substrate, which greatly improves the hardness and wear resistance of the cladding layer.