Due to their distinct physical and metallurgical properties, using conventional fusion welding to direct join steel and magnesium alloy without interlayer metal faces many challenges. In this study, dissimilar joining of a 304 austenitic stainless steel/AZ31B magnesium alloy (304/AZ31B)cladding plate was successfully obtained by explosive welding. A periodic and half-wavy shaped joint was observed at the AZ31B side, while the interface was maintained straight at the 304 side. Microstructure characteristics in the half-wavy shaped joint were analyzed thoroughly by using SEM, EBSD and TEM. The results show that columnar crystals were found at the bottom of the welded joint while fine equiaxed grains were presented in its center, which is similar to that in a fusion joint. The TEM results showed that a thin diffusion layer (80 nm)was formed on the surface of 304 flyer plate. The diffusion at the surface of the 304 plate and melting-solidification near the AZ31B side showed that the AZ31B and 304 were metallurgically bonded. The formation mechanism of the dissimilar welded joint was further discussed and explained by studing the nano-mechanical properties of joint.
All Science Journal Classification (ASJC) codes
- Strategy and Management
- Management Science and Operations Research
- Industrial and Manufacturing Engineering