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<p>In order to investigate the microstructure evolution of Fe-30Mn-8Al-0.9C (wt.%) low-density steel after various solution treatment durations at 1050 °C, the growth behavior of austenite grain size and the precipitation of κ-carbides were systematically analyzed using optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and x-ray diffraction (XRD). The mechanical properties of the test steel were evaluated through tensile testing. The results indicate that the microstructure of the test steel after hot rolling and solution treatment was composed of austenite, ferrite, and κ-carbides. A significant number of annealing twins were observed following the solution treatment. When the solution treatment was conducted at 1050 °C for durations ranging from 30 to 120&#xa0;min, the average size of κ-carbides increased from 0.15&#xa0;μm to a maximum of 0.47&#xa0;μm as the treatment time extended. The tensile strength and yield strength of the test steel in the as-rolled condition are highest, reaching 908 and 660&#xa0;MPa, respectively, with an elongation of 30.20%. As the solution treatment time increases, both tensile strength and yield strength gradually decrease, while elongation initially increases and subsequently decreases. For the solution treatment at 1050 °C for 30&#xa0;min, tensile strength and yield strength are measured at 826 and 442&#xa0;MPa, respectively, with an elongation of 44.60%, resulting in a maximum strength–plasticity product of 36.83 GPa·%.</p>

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Effect of Solution Time on κ-Carbide Precipitation and Mechanical Properties in Fe-30Mn-8Al-0.9C Low-Density Steel

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Mei Xing,
  • Xiao-feng Zhang,
  • Jia-wang Xu,
  • Yong Yang

摘要

In order to investigate the microstructure evolution of Fe-30Mn-8Al-0.9C (wt.%) low-density steel after various solution treatment durations at 1050 °C, the growth behavior of austenite grain size and the precipitation of κ-carbides were systematically analyzed using optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and x-ray diffraction (XRD). The mechanical properties of the test steel were evaluated through tensile testing. The results indicate that the microstructure of the test steel after hot rolling and solution treatment was composed of austenite, ferrite, and κ-carbides. A significant number of annealing twins were observed following the solution treatment. When the solution treatment was conducted at 1050 °C for durations ranging from 30 to 120 min, the average size of κ-carbides increased from 0.15 μm to a maximum of 0.47 μm as the treatment time extended. The tensile strength and yield strength of the test steel in the as-rolled condition are highest, reaching 908 and 660 MPa, respectively, with an elongation of 30.20%. As the solution treatment time increases, both tensile strength and yield strength gradually decrease, while elongation initially increases and subsequently decreases. For the solution treatment at 1050 °C for 30 min, tensile strength and yield strength are measured at 826 and 442 MPa, respectively, with an elongation of 44.60%, resulting in a maximum strength–plasticity product of 36.83 GPa·%.