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<p>This study systematically investigates the effects of annealing time on Mn and Al partitioning behavior, microstructural evolution, and tensile properties, as well as the relationships among these factors in Fe-8.5Mn-3Al-0.2C steel. As a result, the morphology of austenite changes from film-like or equiaxed to blocky. The essence of austenite growth is the migration of <i>α</i>/<i>γ</i> interfaces dominated by element partitioning. When the annealing time is less than 30&#xa0;min, the high-intensity peaks of Mn at <i>α</i>/<i>γ</i> interfaces serve as microstructural signatures of austenite growth. When the annealing time exceeds 60&#xa0;min, the absent Mn peaks at <i>α</i>/<i>γ</i> interfaces suggest the stagnation of interface migration and a substantial slowdown of austenite grain growth, and the enrichment of Al in austenite also avoids the coarsening of austenite grains. In addition, the heterogeneity of Mn between austenite and ferrite gradually increases with increasing annealing time, resulting in the most favorable balance between strength and ductility for the 200 min annealed specimen.</p>

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Unraveling the synergistic interactions of element partitioning, microstructural evolution, and tensile properties during intercritical annealing of Fe-8.5Mn-3Al-0.2C steel

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Ying Sun,
  • Lianfang He,
  • Wendong Zhang,
  • Young-Kook Lee,
  • Zhichao Li,
  • Huiping Li

摘要

This study systematically investigates the effects of annealing time on Mn and Al partitioning behavior, microstructural evolution, and tensile properties, as well as the relationships among these factors in Fe-8.5Mn-3Al-0.2C steel. As a result, the morphology of austenite changes from film-like or equiaxed to blocky. The essence of austenite growth is the migration of α/γ interfaces dominated by element partitioning. When the annealing time is less than 30 min, the high-intensity peaks of Mn at α/γ interfaces serve as microstructural signatures of austenite growth. When the annealing time exceeds 60 min, the absent Mn peaks at α/γ interfaces suggest the stagnation of interface migration and a substantial slowdown of austenite grain growth, and the enrichment of Al in austenite also avoids the coarsening of austenite grains. In addition, the heterogeneity of Mn between austenite and ferrite gradually increases with increasing annealing time, resulting in the most favorable balance between strength and ductility for the 200 min annealed specimen.