Mechanical and microstructural evaluation of resistance spot welded dissimilar TWIP/martensitic steel joints
作者： Salim Aslanlar , Fatih Özen
DOI: 10.1007/S00170-021-06848-3
关键词: Shrinkage 、 Welding 、 Martensite 、 Spot welding 、 Microstructure 、 Materials science 、 Twip 、 Intergranular corrosion 、 Bearing capacity 、 Composite material
摘要: AHSS grade dissimilar TWIP/martensitic steel joints were produced with resistance spot welding different times and currents under 4-kN electrode force. The microstructures examined EDS, SEM, XRD analyses. Fusion zone especially at high heat inputs exhibited considerable amount of shrinkage gaps Mn content–induced voids. (Fe, Mn)xC segregation behavior in heat-affected (HAZ) TWIP was coincided. Segregation adversely affected HAZ limited tensile-shear force bearing capacity. Failure mode change from interfacial failure to nugget pullout mainly controlled by the size diameter. Tearing-type not observed all experiments. All separations failed side due segregation-induced intergranular gaps. Tensile-shear fracture surfaces MxC segregation–induced observed. weld lobe determined according mechanical geometrical calculations.
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