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Mechanical and microstructural evaluation of resistance spot welded dissimilar TWIP/martensitic steel joints

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Abstract

AHSS grade dissimilar TWIP/martensitic steel joints were produced with resistance spot welding with different welding times and welding currents under 4-kN electrode force. The microstructures were examined with EDS, SEM, and XRD analyses. Fusion zone especially at high heat inputs exhibited considerable amount of shrinkage gaps and high Mn content–induced voids. (Fe, Mn)xC segregation behavior in heat-affected zone (HAZ) of TWIP was coincided. Segregation behavior adversely affected HAZ and limited tensile-shear force bearing capacity. Failure mode change from interfacial failure to nugget pullout failure mode was mainly controlled by the nugget size diameter. Tearing-type failure mode was not observed in all experiments. All nugget pullout separations were failed from the TWIP side due to segregation-induced intergranular gaps. Tensile-shear fracture surfaces were examined and MxC segregation–induced gaps were observed. The weld lobe was determined according to mechanical and geometrical calculations.

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Acknowledgements

The authors would like to acknowledge Sakarya University and Sakarya University of Applied Sciences for their laboratory use. The authors also thank ASAŞ Aluminium Company for the use of material characterization devices.

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Authors and Affiliations

  1. Department of Manufacturing and Mechanical Engineering, Faculty of Technology, Batman University, 72060, Batman, Turkey

    Fatih Özen

  2. Department of Metallurgical and Materials Engineering, Faculty of Technology, Sakarya University of Applied Sciences, 54050, Sakarya, Turkey

    Salim Aslanlar

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  1. Fatih Özen
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Dr. Fatih ÖZEN was responsible for methodology, experimental works, metallurgical characterizations, conceptualization, and original draft preparation. Prof. Dr. Salim Aslanlar was responsible for conceptualization, methodology, weld lobe determination, review and editing, and supervision.

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Correspondence to Fatih Özen.

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Özen, F., Aslanlar, S. Mechanical and microstructural evaluation of resistance spot welded dissimilar TWIP/martensitic steel joints. Int J Adv Manuf Technol 113, 3473–3489 (2021). https://doi.org/10.1007/s00170-021-06848-3

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