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<p>The impact of various initial states on the ultimate mechanical properties of medium Mn steel (MMnS) following the hot stamping process is revealed. MMnS blanks with three typical initial states were prepared separately, including hot-rolled, cold-rolled and cold-rolled and annealed (CRA). Their microstructures were observed and analyzed by scanning electron microscopy and electron backscatter diffraction, and their mechanical properties were measured by tensile tests following hot stamping and baking treatments. The results reveal that the microstructure of martensite and residual austenite characterizes the hot-stamped MMnS across different rolling conditions, with CRA state exhibiting a clearly higher residual austenite content compared to the other two states. Meanwhile, CRA state boasts not only the highest tensile strength but also the greatest elongation post-hot stamping treatment. The superior comprehensive mechanical properties are attributed to its unique biphase structure of Mn-rich austenite and Mn-poor ferrite, which emerges in CRA state following a 12&#xa0;h intercritical annealing and can be partially preserved during the hot stamping process. This structure is instrumental in achieving a higher level of residual austenite, consequently leading to enhanced elongation.</p>

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Effect of initial state on microstructure and mechanical properties of medium Mn steel after hot stamping

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Hong-le Li,
  • Tian-yin Zhang,
  • Xing Zhang,
  • Shao-fei Qu,
  • Fernandez Hernandez Borja,
  • Xian-hong Han

摘要

The impact of various initial states on the ultimate mechanical properties of medium Mn steel (MMnS) following the hot stamping process is revealed. MMnS blanks with three typical initial states were prepared separately, including hot-rolled, cold-rolled and cold-rolled and annealed (CRA). Their microstructures were observed and analyzed by scanning electron microscopy and electron backscatter diffraction, and their mechanical properties were measured by tensile tests following hot stamping and baking treatments. The results reveal that the microstructure of martensite and residual austenite characterizes the hot-stamped MMnS across different rolling conditions, with CRA state exhibiting a clearly higher residual austenite content compared to the other two states. Meanwhile, CRA state boasts not only the highest tensile strength but also the greatest elongation post-hot stamping treatment. The superior comprehensive mechanical properties are attributed to its unique biphase structure of Mn-rich austenite and Mn-poor ferrite, which emerges in CRA state following a 12 h intercritical annealing and can be partially preserved during the hot stamping process. This structure is instrumental in achieving a higher level of residual austenite, consequently leading to enhanced elongation.