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<p>The effects of applied axial compressive stress and isothermal transformation temperature on the bainitic transformation behavior of 10CrNi5MoV steel were investigated by thermo-mechanical coupling experiments. Isothermal bainitic transformations were carried out at 350, 400, and 450&#xa0;°C under compressive stresses of 0-200&#xa0;MPa. Transformation kinetics were evaluated using dilatometric measurements, and the resulting microstructures were characterized by SEM and EBSD. The results show that increasing applied stress significantly accelerates the bainitic transformation and increase the final bainitic ferrite fraction. Applied stress promotes the growth of bainitic ferrite packets and effectively refines martensite/austenite (M/A) islands, whereas higher transformation temperatures can also accelerate bainitic transformation and lead to pronounced coarsening of M/A constituents. Crystallographic analysis indicates that the bainitic transformation mainly follows the Kurdjumov–Sachs orientation relationship. Under stress-free conditions, bainitic variants are nearly randomly distributed, while increasing applied stress induces pronounced variant selection. Kinetic and thermodynamic analyses reveal that the promotion of bainitic transformation under applied stress originates from the additional mechanical driving force, which enhances bainite nucleation and transformation kinetics.</p>

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Effects of Applied Stress and Isothermal Temperature on the Bainitic Transformation in 10CrNi5MoV Steel

  • 期刊论文

  • 发表日期：

    2026年4月17日

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  • Ying Bai,
  • Mingzhi Tan,
  • Meixing Yao,
  • Zhenjiang Li,
  • Huiping Qi,
  • Wen Yang

摘要

The effects of applied axial compressive stress and isothermal transformation temperature on the bainitic transformation behavior of 10CrNi5MoV steel were investigated by thermo-mechanical coupling experiments. Isothermal bainitic transformations were carried out at 350, 400, and 450 °C under compressive stresses of 0-200 MPa. Transformation kinetics were evaluated using dilatometric measurements, and the resulting microstructures were characterized by SEM and EBSD. The results show that increasing applied stress significantly accelerates the bainitic transformation and increase the final bainitic ferrite fraction. Applied stress promotes the growth of bainitic ferrite packets and effectively refines martensite/austenite (M/A) islands, whereas higher transformation temperatures can also accelerate bainitic transformation and lead to pronounced coarsening of M/A constituents. Crystallographic analysis indicates that the bainitic transformation mainly follows the Kurdjumov–Sachs orientation relationship. Under stress-free conditions, bainitic variants are nearly randomly distributed, while increasing applied stress induces pronounced variant selection. Kinetic and thermodynamic analyses reveal that the promotion of bainitic transformation under applied stress originates from the additional mechanical driving force, which enhances bainite nucleation and transformation kinetics.