激光熔覆不锈钢-碳钢层合板的材料性能

Material Performance of Laser Cladding Stainless Steel-Carbon Steel Laminated Plates

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。

Laser cladding is introduced as a process for preparing stainless steel -carbon steel metal laminated plates by cladding stainless steel powder on the carbon steel plate. The material properties, such as microstructure element diffusion, micro hardness and tensile fracture morphology, are analyzed through the metal material performance tests. The results show that laser cladding preparation of laminated plates can obtain dense and uniform layer; elements of Fe, Cr, Ni, et al. have a gradient diffusion around the combined surface and the diffusion region is about 12 μm , which indicates that combination of different materials by laser cladding belongs to metallurgical diffusion; micro hardness decreases from cladding layer to matrix, which makes a smooth stress transition between cladding layer and matrix, then enhance its overall mechanical properties; the yielded strength reaches 405 MPa and exceeds that of rolling laminated plates （326 MPa）. Fracture morphology of matrix and diffusion zone belongs to ductile fracture and cladding layer is brittle fracture, further show that the interface of laser cladding laminated plates has a good combination performance.