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<p>Globular retained austenite was obtained in heterogeneous martensite-ferrite lamellae, via flashing in a two-step annealed Fe-0.28C-3.17Mn-0.78Al-1.25Si steel. Multi-step annealing enhances the Mn heterogeneity and enlarges the working window of flashing, and flashing below A<sub>3</sub> retains the martensite-ferrite lamellae. C and Mn enrichment significantly enhanced the stability of globular austenite, and the transformation-induced plasticity (TRIP) effect contributes to excellent tensile strength of 1624&#xa0;MPa, yield strength of 1302&#xa0;MPa, and total elongation of 12.4 pct.</p> Graphical abstract <p></p>

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Globular Austenite Enhanced Ductility in Lean 3Mn Steel by Multi-step Annealing and Flashing

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Jieru Yu,
  • Bin Hu,
  • Yishuang Yu,
  • Zhihui Xiong,
  • Shilong Liu,
  • R. D. K. Misra,
  • Xuejun Jin

摘要

Globular retained austenite was obtained in heterogeneous martensite-ferrite lamellae, via flashing in a two-step annealed Fe-0.28C-3.17Mn-0.78Al-1.25Si steel. Multi-step annealing enhances the Mn heterogeneity and enlarges the working window of flashing, and flashing below A3 retains the martensite-ferrite lamellae. C and Mn enrichment significantly enhanced the stability of globular austenite, and the transformation-induced plasticity (TRIP) effect contributes to excellent tensile strength of 1624 MPa, yield strength of 1302 MPa, and total elongation of 12.4 pct.

Graphical abstract