Effect of High-Temperature Annealing on the Cross-Tension Property of Resistance Spot Welded Medium-Mn Steel

Authors

  • Bingge Zhao Shanghai University, School of Materials Science and Engineering, Center for Advanced Solidification Technology (CAST), Shanghai, 200444, P.R.China https://orcid.org/0000-0002-1996-418X
  • Yuanfang Wang Shanghai University, School of Materials Science and Engineering, Center for Advanced Solidification Technology (CAST), Shanghai, 200444, P.R.China https://orcid.org/0000-0002-5637-6627
  • Chenyu Sun Shanghai University, State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy, 200444, P.R. China
  • Kai Ding Shanghai University, School of Materials Science and Engineering, Center for Advanced Solidification Technology (CAST), Shanghai, 200444, P.R.China https://orcid.org/0000-0002-7744-5791
  • Guanzhi Wu Shanghai University, State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy, 200444, P.R. China https://orcid.org/0000-0002-7764-5371
  • Tao Wei Shanghai University, State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy, 200444, P.R. China https://orcid.org/0000-0002-3818-5675
  • Hua Pan State Key Laboratory of Development and Application Technology of Automotive Steels, Shanghai 201900, P.R. China https://orcid.org/0000-0002-0093-0721
  • Yulai Gao Shanghai University, School of Materials Science and Engineering, Center for Advanced Solidification Technology (CAST), Shanghai, 200444, P.R.China https://orcid.org/0000-0001-9732-5490

DOI:

https://doi.org/10.24425/amm.2022.141054

Abstract

As one of the most promising 3rd generation advanced high strength steels (AHSS), medium Mn steels attract much attention because of their exceptional mechanical property and reasonable cost. However, their application in the modern automotive industry is limited by poor weldability. In this study, 7Mn steel was welded by resistance spot welding (RSW), which was followed by high-temperature annealing to increase the cross-tension property. With this effort, enhanced cross-tension strength (CTS) with a partial interfacial fracture (PIF) mode was realized. During the annealing after RSW that produced martensite, austenitization was realized and then evolved into martensite by the following air cooling. This process produced structure homogeneity across the joint. With respect to the RSW joint, martensite remained the dominant structure after annealing while the diffusion of C and Mn solutes was triggered. With the increase of annealing temperature, the diffusion was enhanced, and the grain boundary embrittlement was reduced, leading to higher CTS.

Published

2022-11-23

How to Cite

Zhao, Bingge, et al. “Effect of High-Temperature Annealing on the Cross-Tension Property of Resistance Spot Welded Medium-Mn Steel”. Archives of Metallurgy and Materials, vol. 67, no. 4, Nov. 2022, doi:10.24425/amm.2022.141054.

Issue

Vol. 67 No. 4 (2022)

Section

Articles