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<p>Multi-layered heterogeneous steels have garnered considerable attention because they combine high strength with economic production. We herein fabricated laminated bis austenitic steel (bi-AS) featuring a high-Mn metastable austenitic steel core, clad with 316L austenitic steel (316L/high-Mn/316L). The fabricated bi-AS shows a higher ultimate tensile strength (UTS) than 316L and high-Mn steel. The remarkable strain-hardening rate and improved UTS of the bi-AS are attributed to the combined effects of hetero-deformation-induced strengthening, twinning-induced plasticity (TWIP), and transformation-induced plasticity (TRIP). A high density of geometrically necessary dislocations is observed at the chemical interface of 316L and high-Mn, contributing to increased strengthening through HDI stress hardening. Moreover, the high-Mn site, characterized by a low stacking fault energy value, undergoes deformation-induced martensitic transformation (DIMT: γ → ε → α′), while the 316L domains undergo deformation twinning, implying TRIP and TWIP effects, respectively. Notably, the stress gradient near the chemical interface promotes DIMT at the chemical composition interface. Overall, this study offers new insights into the deformation behavior of austenite under stress gradients and provides an economical approach to high-strength engineering austenitic steel production.</p>

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Deformation Behavior and Tensile Properties of Layered Bis Austenitic Steel

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Minghao Huang,
  • Changbo Jia,
  • Chunguang Shen,
  • Shenghang Xu

摘要

Multi-layered heterogeneous steels have garnered considerable attention because they combine high strength with economic production. We herein fabricated laminated bis austenitic steel (bi-AS) featuring a high-Mn metastable austenitic steel core, clad with 316L austenitic steel (316L/high-Mn/316L). The fabricated bi-AS shows a higher ultimate tensile strength (UTS) than 316L and high-Mn steel. The remarkable strain-hardening rate and improved UTS of the bi-AS are attributed to the combined effects of hetero-deformation-induced strengthening, twinning-induced plasticity (TWIP), and transformation-induced plasticity (TRIP). A high density of geometrically necessary dislocations is observed at the chemical interface of 316L and high-Mn, contributing to increased strengthening through HDI stress hardening. Moreover, the high-Mn site, characterized by a low stacking fault energy value, undergoes deformation-induced martensitic transformation (DIMT: γ → ε → α′), while the 316L domains undergo deformation twinning, implying TRIP and TWIP effects, respectively. Notably, the stress gradient near the chemical interface promotes DIMT at the chemical composition interface. Overall, this study offers new insights into the deformation behavior of austenite under stress gradients and provides an economical approach to high-strength engineering austenitic steel production.