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<p>In this work, medium-Mn steels with ultra-high strength and good ductility have been developed through a conventional hot rolling process. The microstructural characteristics and superior mechanical properties of the steels were investigated, focusing on 3Mn and 5Mn compositions. Both steels have martensite microstructures with a high dislocation density, and a small amount of retained austenite. Their ultra-high strengths are primarily attributed to martensitic strengthening and high work-hardening capability. The 5Mn steel demonstrates higher tensile strength and ductility, attributed to finer lath size, greater work-hardening capability, and superior grain boundary strengthening. This study emphasizes the synergy between dislocation dynamics, lath martensite strengthening, and work hardening, offering valuable insights for designing advanced structural steels with balanced mechanical properties.</p>

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Investigation of the Hot-Rolled Medium-Mn Steels with Ultra-high Strength and Considerable Ductility

  • 期刊论文

  • 发表日期：

    2025年7月7日

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  • Peng Chen,
  • Jing Wang,
  • Xiao-Wu Li

摘要

In this work, medium-Mn steels with ultra-high strength and good ductility have been developed through a conventional hot rolling process. The microstructural characteristics and superior mechanical properties of the steels were investigated, focusing on 3Mn and 5Mn compositions. Both steels have martensite microstructures with a high dislocation density, and a small amount of retained austenite. Their ultra-high strengths are primarily attributed to martensitic strengthening and high work-hardening capability. The 5Mn steel demonstrates higher tensile strength and ductility, attributed to finer lath size, greater work-hardening capability, and superior grain boundary strengthening. This study emphasizes the synergy between dislocation dynamics, lath martensite strengthening, and work hardening, offering valuable insights for designing advanced structural steels with balanced mechanical properties.