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<p>The production of high-carbon bainitic steels is often hampered by long isothermal holding times, which can extend from several hours to even days, severely limiting the industrial application. Therefore, the impact of ausforming, as a strategy for accelerating bainite transformation process, on transformation kinetics and microstructures in high-carbon bainitic steels was investigated. The results show that ausforming at 400&#xa0;°C significantly enhances both the volume fraction and the rate of bainite transformation, resulting in numerous fine bainite laths and a high content of retained austenite at room temperature. This enhancement is attributed to deformation-induced dislocation networks within the crystal lattice to provide nucleation sites for bainite. Ausforming at a high temperature induced the formation of pearlite, which initially accelerated bainite transformation but ultimately reduced the hardness. Additionally, the orientation relationship between bainite ferrite and parent austenite was near the Kurdjumov–Sachs relationship but with slight deviations due to deformation. These insights may help for optimizing the processes to enable the shorter, more efficient production of high-carbon bainitic steels.</p>

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Investigation on Transformation Kinetics and Microstructure After Prior Austenite Deformation in High-Carbon Bainitic Steel

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Zhenni Chen,
  • Haijiang Hu,
  • Xiaolong Gan,
  • Lifan Wang,
  • Zhongbo Li

摘要

The production of high-carbon bainitic steels is often hampered by long isothermal holding times, which can extend from several hours to even days, severely limiting the industrial application. Therefore, the impact of ausforming, as a strategy for accelerating bainite transformation process, on transformation kinetics and microstructures in high-carbon bainitic steels was investigated. The results show that ausforming at 400 °C significantly enhances both the volume fraction and the rate of bainite transformation, resulting in numerous fine bainite laths and a high content of retained austenite at room temperature. This enhancement is attributed to deformation-induced dislocation networks within the crystal lattice to provide nucleation sites for bainite. Ausforming at a high temperature induced the formation of pearlite, which initially accelerated bainite transformation but ultimately reduced the hardness. Additionally, the orientation relationship between bainite ferrite and parent austenite was near the Kurdjumov–Sachs relationship but with slight deviations due to deformation. These insights may help for optimizing the processes to enable the shorter, more efficient production of high-carbon bainitic steels.