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<p>In this paper, the influence of different laser welding speeds on the microstructure and mechanical properties of warm-rolled medium Mn steel (MMS) and DP980 welded joints (WJ) are studied. The experimental results show that the minimum hardness (258 ± 10 HV) appears in sub-critical heat-affected zone on the DP980 side, where significant softening occurs due to a large amount of tempered martensite, which we refer to as the softening zone. Tensile property of the 2.0&#xa0;m/min sample is best. Its yield strength (YS) and ultimate tensile strength (UTS) are 765&#xa0;MPa and 970&#xa0;MPa. Its total elongation is 19.7%. The final fracture location is on the DP980 base material (BM) side rather than in the weaker strength softening zone. This is because the regions on both sides of the softening zone exert a restraining force, hindering plastic deformation and producing “restraint strengthening.”</p>

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Influence of Laser Welding Speed on Microstructure and Mechanical Properties of Welded Joints between Medium Mn Steel and DP980 Steel

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Haijun Pan,
  • Lei Mao,
  • Wangwang Yu,
  • Zheng Wang,
  • Shunhu Zhang,
  • Chaofan Wei,
  • Wenyu Tao,
  • Xinyu Li,
  • Jing Li,
  • Lin Liu

摘要

In this paper, the influence of different laser welding speeds on the microstructure and mechanical properties of warm-rolled medium Mn steel (MMS) and DP980 welded joints (WJ) are studied. The experimental results show that the minimum hardness (258 ± 10 HV) appears in sub-critical heat-affected zone on the DP980 side, where significant softening occurs due to a large amount of tempered martensite, which we refer to as the softening zone. Tensile property of the 2.0 m/min sample is best. Its yield strength (YS) and ultimate tensile strength (UTS) are 765 MPa and 970 MPa. Its total elongation is 19.7%. The final fracture location is on the DP980 base material (BM) side rather than in the weaker strength softening zone. This is because the regions on both sides of the softening zone exert a restraining force, hindering plastic deformation and producing “restraint strengthening.”