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<p>The Fe-32Mn-9.5Al-0.9C-0.11Nb low-density steel was warm-rolled with 50% reduction at 300-600&#xa0;°C. Optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), x-ray diffraction (XRD), electron backscattering diffraction (EBSD), microhardness, and tensile tests were adopted to evaluate the microstructure and mechanical properties. Results revealed that warm rolling introduced numerous slip bands within the grains, along with the development of substructures including dislocation tangles and dislocation walls. Dislocation slip was the main mechanism of plastic deformation. The corresponding deformation texture was Copper-type texture. With increasing rolling temperature, the intensity of the Copper texture increased, while that of the S and Brass textures decreased. The strength of the steel initially decreased and then increased with rising rolling temperature. At 500&#xa0;°C, the steel exhibited the best balance between strength and elongation. However, at 600&#xa0;°C the precipitation strengthening effect of κ-carbides ((Fe, Mn)<sub>3</sub>AlC) improved the tensile strength and yield strength at the expense of ductility. The fracture morphology shifted from ductile to a ductile-brittle mixed fracture following warm rolling.</p>

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Influence of Warm Rolling Temperature on the Microstructure and Mechanical Properties of Fe-32Mn-9.5Al-0.9C-0.11Nb Low-Density Steel

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Li-shuang Tian,
  • Yi Xiong,
  • Yong Li,
  • Xiao-qin Zha,
  • Shao-ru Zhang,
  • Feng-zhang Ren,
  • Shu-bo Wang

摘要

The Fe-32Mn-9.5Al-0.9C-0.11Nb low-density steel was warm-rolled with 50% reduction at 300-600 °C. Optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), x-ray diffraction (XRD), electron backscattering diffraction (EBSD), microhardness, and tensile tests were adopted to evaluate the microstructure and mechanical properties. Results revealed that warm rolling introduced numerous slip bands within the grains, along with the development of substructures including dislocation tangles and dislocation walls. Dislocation slip was the main mechanism of plastic deformation. The corresponding deformation texture was Copper-type texture. With increasing rolling temperature, the intensity of the Copper texture increased, while that of the S and Brass textures decreased. The strength of the steel initially decreased and then increased with rising rolling temperature. At 500 °C, the steel exhibited the best balance between strength and elongation. However, at 600 °C the precipitation strengthening effect of κ-carbides ((Fe, Mn)3AlC) improved the tensile strength and yield strength at the expense of ductility. The fracture morphology shifted from ductile to a ductile-brittle mixed fracture following warm rolling.