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<p>This paper studies the effects of annealing temperatures (600&#xa0;°C to 750&#xa0;°C) and durations (2-60&#xa0;min) on the microstructure and mechanical properties of cold-rolled Fe-28Mn-8Al-1C lightweight steel with a 90% thickness reduction. The experimental results demonstrate that a bimodal grain structure, characterized by distinct grain size distributions, forms during the recovery and recrystallization of the cold-rolled austenite matrix under elevated annealing temperatures and extended holding times. Concurrently, submicron-scale κ-carbide ((Fe, Mn)<sub>3</sub>AlC) and B2 precipitates emerge and coarsen progressively. The synergy effect of precipitation, HDI strengthening, dislocation strengthening, and recrystallization softening results in an optimal strength-ductility balance in this Fe-28Mn-8Al-1C lightweight steel. A synergy of&#xa0;optimal strengths&#xa0;and ductility was achieved after annealing at 650&#xa0;°C for 10 min,&#xa0;with a yield stress (YS) of 1453&#xa0;MPa, an&#xa0;ultimate tensile strength (UTS) of 1510&#xa0;MPa, and an elongation to failure&#xa0;of 14.8%. Meanwhile,&#xa0;the product of tensile strength and elongation represented a 187% enhancement over the cold-rolled steel. These findings provide insights into optimizing annealing parameters for improved mechanical performance in lightweight steels.</p>

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Revealing the Effect of Annealing on the Microstructural Evolution and Mechanical Properties of a Cold-Rolled Fe-28Mn-8Al-1C Lightweight Steel

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Yi Xiong,
  • Yiyi Wang,
  • Xing Yang,
  • ShaoRu Zhang,
  • Xiaoqin Zha,
  • Yong Li,
  • Fengzhang Ren,
  • Shubo Wang

摘要

This paper studies the effects of annealing temperatures (600 °C to 750 °C) and durations (2-60 min) on the microstructure and mechanical properties of cold-rolled Fe-28Mn-8Al-1C lightweight steel with a 90% thickness reduction. The experimental results demonstrate that a bimodal grain structure, characterized by distinct grain size distributions, forms during the recovery and recrystallization of the cold-rolled austenite matrix under elevated annealing temperatures and extended holding times. Concurrently, submicron-scale κ-carbide ((Fe, Mn)3AlC) and B2 precipitates emerge and coarsen progressively. The synergy effect of precipitation, HDI strengthening, dislocation strengthening, and recrystallization softening results in an optimal strength-ductility balance in this Fe-28Mn-8Al-1C lightweight steel. A synergy of optimal strengths and ductility was achieved after annealing at 650 °C for 10 min, with a yield stress (YS) of 1453 MPa, an ultimate tensile strength (UTS) of 1510 MPa, and an elongation to failure of 14.8%. Meanwhile, the product of tensile strength and elongation represented a 187% enhancement over the cold-rolled steel. These findings provide insights into optimizing annealing parameters for improved mechanical performance in lightweight steels.