激光加工参数对Al2CoCrCuFeNiTi高熵合金涂层质量的影响

摘要

The Al2CoCrCuFeNiTi high-entropy alloy coating was prepared by laser cladding. The effects of laser processing parameters on the quality of high-entropy alloy coating were studied. The results show that:when the laser power is too low, less energy is injected into the coating, the coating and the substrate can not form a good bonding;when the laser power is too high, the substrate surface appears excessive melting and the dilution ratio is too high, resulting in the coating properties decline. Under the condition that the coating and the substrate with a good bonding, with the increase of scanning speed the microstructure becomes fine and uniform, the corrosion resistance becomes better. The optimal process parameters for preparing Al2CoCrCuFeNiTi high-entropy alloy coating by laser cladding are, laser power P=2 500 W, scanning speed V=3 mm/s, the thickness of the cladding powder d=1.0 mm, spot diameter D=4.0 mm.%利用激光熔覆法制备Al2CoCrCuFeNiTi高熵合金涂层，研究激光加工参数对高熵合金涂层质量的影响。结果表明：当激光功率过小时，激光注入能量较少，涂层和基体不能形成良好的结合；当激光功率过大时，基体材料表面熔化过多，所得稀释率过大，造成涂层的性能下降。在保证涂层与基体结合良好的前提下，随扫描速度增大，显微组织变得细小均匀，耐蚀性变好。激光熔覆法制备Al2CoCrCuFeNiTi高熵合金涂层的最佳工艺参数为：激光功率P=2500 W，扫描速度V=3 mm/s，熔覆粉末厚度d=1.0 mm，光斑直径D=4.0 mm。