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<p>In this study, a heterostructured Fe-0.06C-6Mn-1Al medium Mn steel (MMnS) with both mechanical and chemical heterogeneity was fabricated using a two-stage warm rolling process. Compared to a traditional cold rolled MMnS with a homogeneous microstructure, the heterostructured medium Mn steel demonstrates enhanced ultimate tensile strength without compromising ductility, resulting in improved comprehensive mechanical properties. To clarify how the changes in microstructure affect the variation in mechanical properties of the MMnS, the microstructural evolution and the strain partitioning behavior of the heterogeneous MMnS were characterized. The results indicate that the better mechanical properties and strain hardening ability of the heterostructured experimental steel are attributed to the enhanced transformation-induced plasticity (TRIP) effect and hetero-deformation-induced strengthening. Furthermore, the influence of the mechanical and chemical heterogeneity in microstructure on the coordinated deformation mechanism and martensitic transformation behavior of the experimental steel was investigated.</p>

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Influence of Heterogeneous Microstructure on Microstructural Evolution and Mechanical Properties of an Fe-0.06C-6Mn-1Al Medium Mn Steel

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Yuming Zou,
  • Qihan Gao,
  • Haokun Zhu,
  • Zhizheng Cheng,
  • Zaihong Wang,
  • Hua Ding,
  • Zhengyou Tang,
  • Zhouhua Jiang

摘要

In this study, a heterostructured Fe-0.06C-6Mn-1Al medium Mn steel (MMnS) with both mechanical and chemical heterogeneity was fabricated using a two-stage warm rolling process. Compared to a traditional cold rolled MMnS with a homogeneous microstructure, the heterostructured medium Mn steel demonstrates enhanced ultimate tensile strength without compromising ductility, resulting in improved comprehensive mechanical properties. To clarify how the changes in microstructure affect the variation in mechanical properties of the MMnS, the microstructural evolution and the strain partitioning behavior of the heterogeneous MMnS were characterized. The results indicate that the better mechanical properties and strain hardening ability of the heterostructured experimental steel are attributed to the enhanced transformation-induced plasticity (TRIP) effect and hetero-deformation-induced strengthening. Furthermore, the influence of the mechanical and chemical heterogeneity in microstructure on the coordinated deformation mechanism and martensitic transformation behavior of the experimental steel was investigated.