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<p>This paper first conducted annealing experiments on SS400 steel at the critical phase transformation point using a continuous annealing simulator at various heating rates (e.g., 10, 30, 50, 100, 150, and 212&#xa0;°C/s). Subsequently, utilizing techniques such as a tensile testing machine, optical microscope (OM), scanning electron microscope (SEM), and electron backscatter diffraction (EBSD), the effects of heating rate on the mechanical properties, microstructure, and texture of SS400 steel during critical phase transformation annealing were investigated. The results indicate that the heating rate has little effect on the mechanical properties of the experimental steel, such as yield strength, tensile strength, and <i>n</i>-value (strain hardening exponent), which are approximately 346&#xa0;MPa, 460&#xa0;MPa, and 0.16, respectively. However, when the heating rate reached 212&#xa0;°C/s, the elongation significantly decreased to 20.4993%. Under different heating rates, the grain morphology of the experimental steel exhibited polygonal equiaxed shapes. As the heating rate increased, the average grain size increased from 7.33 to 8.87&#xa0;μm. The {100} &lt; 011 &gt; rotated cube texture and {100} &lt; 001 &gt; cube texture first increased and then decreased, while the <i>λ</i>-fiber texture, Goss texture, and α*-fiber texture first decreased and then increased. When the heating rate reached 212&#xa0;°C/s, the recrystallized grain orientations were predominantly <i>λ</i>- &lt; 111 &gt; //ND and Goss texture.</p>

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Influence of Heating Rate on Critical Phase Transformation, Texture, and Property Evolution of SS400 Steel

  • 期刊论文

  • 发表日期：

    2025年10月10日

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  • Pei Zou,
  • Zhichao Li,
  • Yutang Wang,
  • Qiming Wang,
  • Tian Xia

摘要

This paper first conducted annealing experiments on SS400 steel at the critical phase transformation point using a continuous annealing simulator at various heating rates (e.g., 10, 30, 50, 100, 150, and 212 °C/s). Subsequently, utilizing techniques such as a tensile testing machine, optical microscope (OM), scanning electron microscope (SEM), and electron backscatter diffraction (EBSD), the effects of heating rate on the mechanical properties, microstructure, and texture of SS400 steel during critical phase transformation annealing were investigated. The results indicate that the heating rate has little effect on the mechanical properties of the experimental steel, such as yield strength, tensile strength, and n-value (strain hardening exponent), which are approximately 346 MPa, 460 MPa, and 0.16, respectively. However, when the heating rate reached 212 °C/s, the elongation significantly decreased to 20.4993%. Under different heating rates, the grain morphology of the experimental steel exhibited polygonal equiaxed shapes. As the heating rate increased, the average grain size increased from 7.33 to 8.87 μm. The {100} < 011 > rotated cube texture and {100} < 001 > cube texture first increased and then decreased, while the λ-fiber texture, Goss texture, and α*-fiber texture first decreased and then increased. When the heating rate reached 212 °C/s, the recrystallized grain orientations were predominantly λ- < 111 > //ND and Goss texture.