Mechanical performance and formability of laser-welded dissimilar butt joints between medium-Mn stainless steel and high-strength carbon steel

The mechanical performance and stretch formability of dissimilar butt joints between medium-Mn stainless steel (MMn-SS) high-strength carbon (HS-CS) processed by laser welding using different parameters were studied under uniaxial biaxial loadings applied tensile Erichsen cupping tests, respectively. Laser scanning microscopy electron backscatter diffraction (EBSD) used to study the microstructural evolution. An probe microanalyzer (EPMA) was employed analyse distribution alloying elements within weld zone. dominating deformation mechanisms operating in paired metals during stretch-forming identified through EBSD analysis. revealed that a fully martensitic microstructure is promoted fusion zones (FZs) weldments with low high specific point energy (SPE 19, 25, 30 J). Consequently, hardness values FZs slightly decreased SPE. Similarly, properties not affected since failure occurred at softer base metal HS-CS. During exhibited various mechanisms. formation shear bands (SBs) strain-induced martensite along SBs observed be features MMn-SS. However, HS-CS deformed general mode, i.e., dislocation-mediated plasticity.