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<p>The hot deformation behavior of Fe-25Mn-12Al-1C-3.5Ni low-density steel was investigated through high-temperature compression tests conducted at temperatures of 900–1200&#xa0;℃ and strain rates of 0.01–10&#xa0;s⁻<sup>1</sup>. The results revealed that flow stress increased with rising strain rate and decreasing temperature. Secondary hardening was induced by the synergistic effects of B2-phase DRX and strain localization in austenite when the strain rate was 0.1&#xa0;s<sup>–1</sup>. The calculated hot deformation activation energy was 520.44&#xa0;kJ/mol, significantly higher than conventional low-density steels. The hot processing map indicated that the optimal hot working parameters for the experimental steel were 1050–1130&#xa0;℃ and 0.01–0.1&#xa0;s⁻<sup>1</sup>.Two instability regions should be avoided in hot processing. Under high-temperature/high-strain-rate conditions (1100–1200&#xa0;℃, 0.5–10&#xa0;s⁻<sup>1</sup>), incomplete DRX resulted in micro-voids nucleation and intergranular fracture propagation. When the material was subjected to low-temperature/high-strain-rate combinations (900–950&#xa0;℃, 0.36–10&#xa0;s⁻<sup>1</sup>), undissolved κ-carbides induced strain localization and surface cracks.</p> Graphical Abstract <p></p>

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Hot deformation behavior of Fe-25Mn-12Al-1C-3.5Ni low-density steel: constitutive analysis and processing maps

  • 期刊论文

  • 发表日期：

    2025年8月12日

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  • B. Zhang,
  • S. Lu,
  • H. J. Pan,
  • X. Liu,
  • L. X. Du,
  • X. N. Wang

摘要

The hot deformation behavior of Fe-25Mn-12Al-1C-3.5Ni low-density steel was investigated through high-temperature compression tests conducted at temperatures of 900–1200 ℃ and strain rates of 0.01–10 s⁻1. The results revealed that flow stress increased with rising strain rate and decreasing temperature. Secondary hardening was induced by the synergistic effects of B2-phase DRX and strain localization in austenite when the strain rate was 0.1 s–1. The calculated hot deformation activation energy was 520.44 kJ/mol, significantly higher than conventional low-density steels. The hot processing map indicated that the optimal hot working parameters for the experimental steel were 1050–1130 ℃ and 0.01–0.1 s⁻1.Two instability regions should be avoided in hot processing. Under high-temperature/high-strain-rate conditions (1100–1200 ℃, 0.5–10 s⁻1), incomplete DRX resulted in micro-voids nucleation and intergranular fracture propagation. When the material was subjected to low-temperature/high-strain-rate combinations (900–950 ℃, 0.36–10 s⁻1), undissolved κ-carbides induced strain localization and surface cracks.

Graphical Abstract