Effect of process parameters on interface microstructure and performance in laser welding of steel-ZrO2 ceramic

Abstract

The laser was used to weld the stainless steel and the ZrO2 ceramic. By adding a AgCuTi filler layer for the laser welding. The formation of the reaction products is affected by the mutual diffusion of Fe, Ti and Cu between the base metal and the filler during the welding process, and the diffusion behavior between the atoms is closely related to the heat input during welding. Therefore, the heat input during welding has a direct impact on the Fe–Ti and Fe–Cu metallic compounds in the joint. Referred to the advantages and disadvantages of the above welding methods, and proposed a design scheme of ceramic/steel hybrid joints with transition section. In this study, it was found that although the ceramic side was the fracture area, the overall refinement of the grains in the joint interface was beneficial to the increase of the joint strength. In the welding process, the heat reaching the filler interface is mainly controlled by the process parameters such as laser power, welding speed and laser offset. In this study, the required laser welding parameters were determined by the cross-sectional state of the joint, the microstructure of the interface and the mechanical properties, and then the coupling control of the welding parameters (power, welding speed, offset) with the interface temperature and microstructure was realized. The connection between steel and ceramic was parametrically optimized and the ceramic side was analyzed by interface thermal and mechanical simulation, and the mechanism of the connection was explained.