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<p>This study develops low-density, high-strength dual-phase steels with δ-ferrite via Mn/Al alloying to substitute nickel. Synergistic effects of Mn/Al on microstructure-property relationships in nickel-free high-Mn steels at room and low temperatures are systematically clarified. Three graded-composition alloys were designed to investigate phase evolution, revealing that Mn/Al co-addition induces δ-ferrite, where the synergistic interplay of phase volume fraction and coarsening behavior leads to a strength-ductility inversion. Alternating lamellar δ-ferrite/austenite microstructures improve low-temperature properties: elongation increases to 1.5 times the original value while sustaining high strength, and impact toughness remains no less than 81.8&#xa0;J/cm<sup>2</sup>. This value is comparable to the impact toughness of cryogenic 9Ni steel and meets application requirements.</p>

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Research on the Microstructure and Mechanical Properties of Hot-Rolled Fe-Mn-Al-C Nickel-Free Cryogenic Steel

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Xiaofeng Zhang,
  • Zhongyong Yang,
  • Xinlei Zhao,
  • Lele Dai,
  • Yong Yang

摘要

This study develops low-density, high-strength dual-phase steels with δ-ferrite via Mn/Al alloying to substitute nickel. Synergistic effects of Mn/Al on microstructure-property relationships in nickel-free high-Mn steels at room and low temperatures are systematically clarified. Three graded-composition alloys were designed to investigate phase evolution, revealing that Mn/Al co-addition induces δ-ferrite, where the synergistic interplay of phase volume fraction and coarsening behavior leads to a strength-ductility inversion. Alternating lamellar δ-ferrite/austenite microstructures improve low-temperature properties: elongation increases to 1.5 times the original value while sustaining high strength, and impact toughness remains no less than 81.8 J/cm2. This value is comparable to the impact toughness of cryogenic 9Ni steel and meets application requirements.