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<p>Fe–Mn–Al–C lightweight steels are promising candidates for structural applications in extreme cryogenic environments due to their superior strength–toughness balance. This study investigates the influence of aluminum content (6, 8, and 10&#xa0;wt&#xa0;pct) on the mechanical properties and deformation mechanisms of austenitic Fe–Mn–Al–C steels at − 196&#xa0;°C. All alloys exhibit tensile strengths above 1000&#xa0;MPa. Moderate Al addition (6–8&#xa0;wt&#xa0;pct) enhances elongation via twinning and planar slip, while excessive Al (10&#xa0;wt&#xa0;pct) leads to δ-ferrite and κ-carbide precipitation, suppressing twinning and causing brittle fracture. Impact toughness drops sharply from 144.6 to 3.9 J with increasing Al content, indicating severe embrittlement. These findings demonstrate that optimizing Al content is critical to achieving strong-tough synergy in cryogenic applications.</p>

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Low-Temperature Deformation Mechanisms and Fracture Behavior of Fe–Mn–Al–C Lightweight Steels with Varying Al Content

  • 期刊论文

  • 发表日期：

    2025年10月23日

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  • Shiyuan Duan,
  • Shifeng Liu,
  • Yan Wang,
  • Changjun Wang,
  • Chunxu Wang

摘要

Fe–Mn–Al–C lightweight steels are promising candidates for structural applications in extreme cryogenic environments due to their superior strength–toughness balance. This study investigates the influence of aluminum content (6, 8, and 10 wt pct) on the mechanical properties and deformation mechanisms of austenitic Fe–Mn–Al–C steels at − 196 °C. All alloys exhibit tensile strengths above 1000 MPa. Moderate Al addition (6–8 wt pct) enhances elongation via twinning and planar slip, while excessive Al (10 wt pct) leads to δ-ferrite and κ-carbide precipitation, suppressing twinning and causing brittle fracture. Impact toughness drops sharply from 144.6 to 3.9 J with increasing Al content, indicating severe embrittlement. These findings demonstrate that optimizing Al content is critical to achieving strong-tough synergy in cryogenic applications.