对比三种磁场强度下激光表面熔覆316L不锈钢涂层的显微组织与性能,分别采用三维激光扫描共聚焦显微镜、金相显微镜及扫描电子显微镜拍摄三种熔覆层的表面形貌、金相组织及摩擦磨损形貌。结果表明,磁场的引入可以降低熔覆层的表面粗糙度,优化表面形貌。当磁场强度达到400 mT时,熔覆层晶粒得到显著细化,同时气孔和裂纹减少,平均显微硬度达到573 HV,提高幅度达25%,表面耐磨性能也因此得到显著提高。

The microstructure and properties of laser cladding 316L stainless steel coating under three magnetic field intensities are compared. The surface morphologies, metallographic structures, and friction and wear morphologies of the three cladding layers are characterized via three-dimensional laser scanning confocal microscopy, metallurgical microscopy, and scanning electron microscopy, respectively. Results show that the application of magnetic field can reduce the surface roughness of the cladding layer and optimize the surface morphology. The grains in the cladding layer are considerably refined when the magnetic field intensity becomes 400 mT. In addition, the number of pores and cracks decreases. The average microhardness increases by 25% to become 573 HV, and the wear resistance is considerably improved.