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<p>This study explores the development of a cost-effective, high-strength, maraging-like medium-Mn steel (Fe–0.2C–7Mn–2Al) through a facile one-step warm rolling process. The warm-rolled medium-Mn steel exhibits a yield strength close to its ultimate tensile strength (&gt;&#xa0;1600&#xa0;MPa) and high ductility (~16&#xa0;pct post-uniform elongation), similar to those of 18Ni1700 maraging steel. Comprehensive microstructural analyses reveals that the warm-rolled samples had a uniform tempered martensite structure with intensive cementite precipitates and high dislocation density, both of which elevate the yield strength but minimize strain-hardening behaviors. The maraging-like tensile behavior of warm-rolled medium-Mn steel is attributable to a combination of dislocation strengthening and precipitation hardening in the martensite matrix with ultra-low carbon content, with the high dislocation density and cementite precipitation playing critical roles. In contrast, the hot-rolled counterpart with a mixture of fresh and tempered martensite has a lower yield strength and higher strain hardening owing to strain partitioning. This study demonstrates that medium-Mn steels, when combined with maraging-inspired strengthening strategies, can provide viable and cost-effective alternatives to traditional maraging steels for advanced engineering applications.</p>

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Maraging-Like Tensile Behavior of Warm-Rolled Medium-Mn Steel

  • 期刊论文

  • 发表日期：

    2025年7月25日

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  • Z. H. Chen,
  • C. Hu,
  • M. X. Huang,
  • B. B. He

摘要

This study explores the development of a cost-effective, high-strength, maraging-like medium-Mn steel (Fe–0.2C–7Mn–2Al) through a facile one-step warm rolling process. The warm-rolled medium-Mn steel exhibits a yield strength close to its ultimate tensile strength (> 1600 MPa) and high ductility (~16 pct post-uniform elongation), similar to those of 18Ni1700 maraging steel. Comprehensive microstructural analyses reveals that the warm-rolled samples had a uniform tempered martensite structure with intensive cementite precipitates and high dislocation density, both of which elevate the yield strength but minimize strain-hardening behaviors. The maraging-like tensile behavior of warm-rolled medium-Mn steel is attributable to a combination of dislocation strengthening and precipitation hardening in the martensite matrix with ultra-low carbon content, with the high dislocation density and cementite precipitation playing critical roles. In contrast, the hot-rolled counterpart with a mixture of fresh and tempered martensite has a lower yield strength and higher strain hardening owing to strain partitioning. This study demonstrates that medium-Mn steels, when combined with maraging-inspired strengthening strategies, can provide viable and cost-effective alternatives to traditional maraging steels for advanced engineering applications.