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Abstract <p>This study investigated the superplastic deformation of Fe–10Mn–4Al–(0.5, 1.5, and 3)Si–0.3C steels. A moderate fraction of <i>δ</i>-ferrite (~ 30 pct) in the 1.5Si steel accommodated more strain, achieving a significant elongation of ~ 1210 pct. Conversely, a high fraction of <i>δ</i>-ferrite (~ 60 pct) in the 3Si steel caused hardening due to enhanced grain coarsening, reducing elongation to ~ 830 pct. Microstructural analysis revealed that dynamic <i>γ</i> → <i>α</i> transformation alleviates stress concentration caused by grain boundary sliding, thereby enhancing high-temperature tensile ductility.</p> Graphical Abstract <p></p>

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Achieving Superior Superplasticity of ~ 1200 pct in Medium Mn Lightweight Steel Containing Coarse δ-Ferrite via Dynamic γ → α Transformation

  • 期刊论文

  • 发表日期：

    2025年3月26日

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  • H. T. Zhang,
  • N. Xiao,
  • S. H. Sun,
  • W. Z. Hao,
  • P. J. H. Zhang,
  • H. L. Yan,
  • M. H. Cai,
  • Y.-K. Lee

摘要

Abstract

This study investigated the superplastic deformation of Fe–10Mn–4Al–(0.5, 1.5, and 3)Si–0.3C steels. A moderate fraction of δ-ferrite (~ 30 pct) in the 1.5Si steel accommodated more strain, achieving a significant elongation of ~ 1210 pct. Conversely, a high fraction of δ-ferrite (~ 60 pct) in the 3Si steel caused hardening due to enhanced grain coarsening, reducing elongation to ~ 830 pct. Microstructural analysis revealed that dynamic γ → α transformation alleviates stress concentration caused by grain boundary sliding, thereby enhancing high-temperature tensile ductility.

Graphical Abstract