论文部分内容阅读
采用激光熔覆工艺将不锈钢粉末熔覆在碳钢板上,制备不锈钢-碳钢层合板。通过金属材料性能检测试验,对不锈钢-碳钢层合板的金相组织、元素扩散、显微硬度及拉伸断口形貌等性能进行分析。结果表明,激光熔覆制备层合板获得了致密均匀的覆层;结合面两侧Fe、Cr、Ni等元素呈梯度扩散,扩散区域约为12μm,表明激光熔覆复合材料为扩散型冶金结合;覆层到基体硬度逐渐减小,这使覆层与基体之间应力平稳过渡,提升了其整体力学性能;其屈服强度为405 MPa,超过轧制层合板的326 MPa。基体和扩散区断口形貌为韧性断裂,而覆层表现为脆性断裂,进一步表明激光熔覆层合板结合面结合性能良好。
A stainless steel-carbon steel laminate was prepared by cladding stainless steel powder on a carbon steel plate by a laser cladding process. The properties of stainless steel-carbon steel laminates were analyzed by the test of metal material properties, such as the microstructure, elemental diffusion, microhardness and tensile fracture appearance. The results show that the cladding layer obtained by laser cladding has a dense and uniform coating. The elements such as Fe, Cr and Ni on both sides of the bonding surface are diffused in a gradient manner. The diffusion area is about 12μm, which indicates that the laser cladding composites are diffusion metallurgical bonding. The hardness of the coating decreases gradually to the substrate, which makes the stress transfer smoothly between the coating and the substrate, which enhances the overall mechanical properties. The yield strength is 405 MPa, which exceeds 326 MPa of the rolled laminate. The fracture morphology of the matrix and diffusion zone is ductile fracture, while the coating shows brittle fracture, which further shows that the bonding surface of the laser clad laminate has good bonding properties.