Integrity evolution during dissimilar welding of TWIP steel

The integrity evolution induced by manufacturing involving dissimilar TWIP and mild steel weld spots was investigated. Focus was given to the effect of manufacturing parametrization on controlling the dilution of the alloying elements and the resulting weld integrity. Samples manufactured with different conditions were characterized by chemical and phase composition, morphology, and mechanical properties. The findings showed that the distribution of chemical composition and metallurgical features are sensitive to the welding parameters. The influence of manufacturing on weld morphology was noticed. Manganese distribution is affected by the welding cycle, thus leading to austenite destabilization and brittle behavior upon a quasi-static tensile shear strength test. A processing set was proposed to control manganese dilution and martensite transformation.

Automated summary

This study investigates the integrity evolution induced by manufacturing involving dissimilar TWIP and mild steel weld spots, with a focus on the effect of manufacturing parameters on controlling the dilution of alloying elements and resulting weld integrity. Samples manufactured under different conditions were analyzed for chemical and phase composition, morphology, and mechanical properties. The findings demonstrate that the distribution of chemical composition and metallurgical features is sensitive to welding parameters, and manufacturing influences weld morphology. Manganese distribution is affected by the welding cycle, resulting in austenite destabilization and brittle behavior in quasi-static tensile shear strength tests. A processing set is proposed to control manganese dilution and martensite transformation.