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<p>This study examines the impact of short aging treatment on FeMnAlC low-density steel. The intragranular κ carbides exhibit an increase in size and undergo a morphological transformation from nanosphere to lamellar as the short aging temperature rises from 500 ℃ to 900 ℃. The volume fraction peaks at 600 ℃, and at 700 ℃, intergranular κ carbides, accompanied by α-phase precipitation, infiltrate the austenite matrix. Upon surpassing the κ carbide dissolution threshold, further increases in aging temperature result in its dissolution into the matrix. The Rockwell hardness attains a maximum of 38.5 HRC at 700 ℃. The low-temperature impact toughness decreases initially from 31&#xa0;J at 500 ℃ to below 5&#xa0;J, then rises to 17.5&#xa0;J at 900 ℃. This increase is attributed to the presence of excessive intergranular κ carbides, which induce brittle fracture.</p>

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Effect of Short-Aging Treatment on κ Carbide, Microstructure and Impact Properties of FeMnAlC Low-Density Steel

  • 期刊论文

  • 发表日期：

    2025年4月29日

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  • Yanguang Cao,
  • Tenghao Zhang,
  • Ke Zhang,
  • Xibin Fu,
  • Xiaofeng Zhang,
  • Zhaodong Li,
  • Xi Zhang,
  • Qilong Yong

摘要

This study examines the impact of short aging treatment on FeMnAlC low-density steel. The intragranular κ carbides exhibit an increase in size and undergo a morphological transformation from nanosphere to lamellar as the short aging temperature rises from 500 ℃ to 900 ℃. The volume fraction peaks at 600 ℃, and at 700 ℃, intergranular κ carbides, accompanied by α-phase precipitation, infiltrate the austenite matrix. Upon surpassing the κ carbide dissolution threshold, further increases in aging temperature result in its dissolution into the matrix. The Rockwell hardness attains a maximum of 38.5 HRC at 700 ℃. The low-temperature impact toughness decreases initially from 31 J at 500 ℃ to below 5 J, then rises to 17.5 J at 900 ℃. This increase is attributed to the presence of excessive intergranular κ carbides, which induce brittle fracture.