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采用激光熔覆法,在20钢表面制备出Ni60合金熔覆层。通过金相显微镜分析了熔覆层的组织形貌,用显微硬度计测试了熔覆层的显微硬度,摩擦磨损试验仪进行了耐磨性试验,研究了激光功率、扫描速度等工艺参数对熔覆层组织性能的影响,确定了最优工艺参数。结果表明,在激光功率1800 W、扫描速度150 mm·min-1的条件下,所得熔覆层表面光滑致密,组织细小均匀,与基体实现了良好的冶金结合;在此工艺参数下,熔覆层不仅具有较高的耐磨性能和较低的摩擦因数,且硬度提高到20钢的约1.7倍。
Using laser cladding method, Ni60 alloy cladding layer was prepared on the surface of 20 steel. The microstructure of the cladding layer was analyzed by metallographic microscope. The microhardness of the cladding layer was measured by microhardness tester. The wear resistance of the tester was tested. The laser power, scanning speed and other parameters On the microstructure and properties of the cladding, determine the optimal process parameters. The results show that under the conditions of laser power of 1800 W and scanning speed of 150 mm · min-1, the surface of the obtained cladding layer is smooth and compact with fine and uniform microstructure and good metallurgical bonding with the substrate. Under this technological condition, cladding The layer not only has higher wear resistance and lower friction factor, but also increases the hardness to about 1.7 times 20 steel.