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<p>A novel deformed and partitioned steel with a layered duplex microstructure demonstrates a simultaneous increase in both strength and toughness as temperature decreases, attaining an unprecedented combination of strength (2.1&#xa0;GPa) and toughness (104&#xa0;MPa&#xa0;m<sup>1/2</sup>) at − 78.5&#xa0;°C. Synergistic effects of delamination-induced stress relaxation and transformation-induced plasticity-mediated crack closure promote anomalous toughening. This coupled intrinsic/extrinsic toughening mechanisms induced by hetero-structure address the low-temperature toughness challenge in ultrahigh-strength steels.</p>

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Anomalous Low-Temperature Toughening in 2 GPa Ultrahigh-Strength Steel by Synergistic Effect of Delamination and TRIP

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • Biaobiao Wang,
  • Zhongyuan Ren,
  • Jiayu Wang,
  • Yao Lu,
  • Zhao Lei,
  • Liang Zhen,
  • Li Liu

摘要

A novel deformed and partitioned steel with a layered duplex microstructure demonstrates a simultaneous increase in both strength and toughness as temperature decreases, attaining an unprecedented combination of strength (2.1 GPa) and toughness (104 MPa m1/2) at − 78.5 °C. Synergistic effects of delamination-induced stress relaxation and transformation-induced plasticity-mediated crack closure promote anomalous toughening. This coupled intrinsic/extrinsic toughening mechanisms induced by hetero-structure address the low-temperature toughness challenge in ultrahigh-strength steels.