45钢表面激光熔覆316L涂层显微组织与性能

采用激光熔覆技术在45钢表面制备316L合金涂层，分析了激光熔覆层的微观组织，测试了激光熔覆层的微观显微硬度。结果表明：激光熔覆区显微组织为细小树枝状结晶组织，熔覆区微观组织均匀致密以及存在着硬质点弥散分布，使得表面耐蚀性、硬度和耐磨性大幅度提高。熔覆层中残余应力一般是拉应力，随着熔覆层厚度的增加，应力回落并逐渐稳定下来，且基体残余应力较熔覆层小。

Microstructure & Performance of 316L Laser Cladding on 45 Steel Substrate

Laser cladding of 316L steel powders on 45 Steel Substrate was conducted, and microstructure of laser cladding coating was analyzed. The micro-hardness of laser cladding layer was examined. The results showed that microstructure of laser cladding zone was exiguous dentrite, and there were dispersion of hard spots in the laser cladding zone. Performances of erode-resistant, surface hardness and wear-resistant were improved obviously. The residual stress in cladding coating was usually tensile stress, with the further increasing depth of coating, the residual stress began to fall and stabilized gradually, and the residual stress values in substrate was smaller than in cladding coating.