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<p>The mechanical stability of austenite and mechanical properties of a Fe-0.3C-7Mn-3.5Al steel processed by High-Ratio Differential Speed Rolling (HRDSR) and treated at different intercritical annealing (IA) temperatures were investigated. The specific IA temperatures are 610, 710, and 760&#xa0;°C. The experimental results show that as the IA temperature increases from 610 to 760&#xa0;°C, the grain size in the edge region of the sample increases from 0.93 to 1.01&#xa0;μm, and the grain size in the core region of the sample increases from 0.95 to 1.32&#xa0;μm. Additionally, the hardness value decreases from 295(±&#xa0;5) to 255(±&#xa0;5) HV as the IA temperature increases from 610 to 760&#xa0;°C. The hardness value in the edge was greater than that in the core region. The variation of grain size and hardness values with IA temperature is closely related to the recrystallization behavior during IA process. The product of strength and elongation is 37&#xa0;GPa&#xa0;% at 610&#xa0;°C, then increases up to 52&#xa0;GPa&#xa0;% at 710&#xa0;°C, finally decreases to 28&#xa0;GPa&#xa0;% at 760&#xa0;°C. This is consistent with the trend of the volume fraction of retained austenite (RA). It should be noted that the elongation of the experimental steel can reach 60%, which is much higher than that in steels with similar composition reported in other works.</p>

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Gradient Microstructure and Mechanical Properties of a Fe-0.3C-7Mn-3.5Al Alloy Treated at Different Intercritical Annealing Temperatures

  • 期刊论文

  • 发表日期：

    2025年3月20日

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  • Zheng Wang,
  • Haijun Pan,
  • Zhiqiang Wu,
  • Yewei Tang,
  • Jinsheng Yuan,
  • Feifan Zang,
  • Lanlan Cai

摘要

The mechanical stability of austenite and mechanical properties of a Fe-0.3C-7Mn-3.5Al steel processed by High-Ratio Differential Speed Rolling (HRDSR) and treated at different intercritical annealing (IA) temperatures were investigated. The specific IA temperatures are 610, 710, and 760 °C. The experimental results show that as the IA temperature increases from 610 to 760 °C, the grain size in the edge region of the sample increases from 0.93 to 1.01 μm, and the grain size in the core region of the sample increases from 0.95 to 1.32 μm. Additionally, the hardness value decreases from 295(± 5) to 255(± 5) HV as the IA temperature increases from 610 to 760 °C. The hardness value in the edge was greater than that in the core region. The variation of grain size and hardness values with IA temperature is closely related to the recrystallization behavior during IA process. The product of strength and elongation is 37 GPa % at 610 °C, then increases up to 52 GPa % at 710 °C, finally decreases to 28 GPa % at 760 °C. This is consistent with the trend of the volume fraction of retained austenite (RA). It should be noted that the elongation of the experimental steel can reach 60%, which is much higher than that in steels with similar composition reported in other works.