激光重熔工艺对YCF101涂层质量的影响

YCF101合金(铁基)涂层耐磨耐蚀以及合适的硬度,是机床零件再制造理想涂层。为制备高表面质量的涂层,研究了不同重熔工艺参数对YCF101涂层质量的影响。采用激光共聚焦显微镜(LEXT OLS4100)对涂层表面形貌、组织和截面质量进行了分析。研究结果表明,激光重熔有效提高涂层表面质量;在相同的重熔工艺参数下,重熔轨迹与熔覆轨迹呈45°的重熔方式,重熔质量最好;重熔功率为200 W,重熔速度9 mm/s,重熔间距1 mm时,涂层质量最好;随着重熔功率增加,涂层裂纹增多;重熔后熔池内部细密的晶粒被柱状晶取代,涂层截面组织均匀,涂层表面组织晶粒细化。

Effect of laser remelting parameters on the qualities of YCF101 coating

YCF101 (Fe-based alloy) coating is an ideal coating for machine parts remanufacturing due to its good wear and corrosion resistance,and suitable hardness.In order to prepare high surface quality coatings,the effects of different remelting parameters on the quality of YCF101 coatings were studied.The surface morphology,microstructure and cross section quality of the coating were analyzed by laser scanning confocal microscope (LEXT OLS4100).The results show that laser remelting can effectively improve the surface quality of the coating.Under the same remelting parameters,the best remelting mode is the remelting trajectory and the cladding trajectory are 45 degree;when the remelting power is 200 W,the remelting scan speed is 9 mm/s,and the remelting distance is 1 mm,the coating quality is the best.With the increase of remelting power,the coating crack is increased.In addition,after remelting,the fine grains inside the molten pool are replaced by columnar grains,and the grains in cross-sections are uniform,and the microstructure of the coating surface is refined.