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<p>To elucidate the dynamic recrystallization (DRX) mechanism of 254SMO superaustenitic stainless steel (SASS) during high-temperature deformation, isothermal compression tests were performed on a Gleeble-3800 simulator at deformation temperatures of 900–1200&#xa0;°C, strain rates of 0.01–10 s⁻<sup>1</sup>, and a true strain of 0.916. An Arrhenius-type constitutive model with strain compensation and a DRX kinetic model were developed, achieving a prediction accuracy with a correlation coefficient <i>R</i> of 0.99. The deformed microstructures were characterized using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The results reveal that at 950–1050&#xa0;°C, high curvature is mainly concentrated at grain boundaries, where local bulging and dislocation annihilation facilitate preferential nucleation, indicative of discontinuous dynamic recrystallization (DDRX). At 1050–1200&#xa0;°C, the fraction and continuity of high-curvature segments decrease, and continuous dynamic recrystallization (CDRX) dominates, driven by subgrain rotation, grain fragmentation, and lattice rotation. At a strain rate of 10 s⁻<sup>1</sup>, DRX grains are orderly distributed along Σ3 twin boundaries, with boundary orientations highly consistent with twin structures, suggesting the occurrence of twin-induced dynamic recrystallization (TDRX). In this study, local grain boundary curvature is introduced for the first time as a key internal variable to elucidate the transition of DRX mechanisms from grain boundary bulging to intragranular substructure evolution.</p>

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Evolution of local grain boundary curvature and multi-mode nucleation mechanisms of dynamic recrystallization in 254SMO steel

  • 期刊论文

  • 发表日期：

    2026年2月5日

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  • Yongxing Jiao,
  • Fengwei Zhou,
  • Zhenlong Li,
  • Guolei Dong,
  • Yiyong Zhi,
  • Yuanfei Xu,
  • Zhizhong Wang,
  • Dongjie Qiao

摘要

To elucidate the dynamic recrystallization (DRX) mechanism of 254SMO superaustenitic stainless steel (SASS) during high-temperature deformation, isothermal compression tests were performed on a Gleeble-3800 simulator at deformation temperatures of 900–1200 °C, strain rates of 0.01–10 s⁻1, and a true strain of 0.916. An Arrhenius-type constitutive model with strain compensation and a DRX kinetic model were developed, achieving a prediction accuracy with a correlation coefficient R of 0.99. The deformed microstructures were characterized using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The results reveal that at 950–1050 °C, high curvature is mainly concentrated at grain boundaries, where local bulging and dislocation annihilation facilitate preferential nucleation, indicative of discontinuous dynamic recrystallization (DDRX). At 1050–1200 °C, the fraction and continuity of high-curvature segments decrease, and continuous dynamic recrystallization (CDRX) dominates, driven by subgrain rotation, grain fragmentation, and lattice rotation. At a strain rate of 10 s⁻1, DRX grains are orderly distributed along Σ3 twin boundaries, with boundary orientations highly consistent with twin structures, suggesting the occurrence of twin-induced dynamic recrystallization (TDRX). In this study, local grain boundary curvature is introduced for the first time as a key internal variable to elucidate the transition of DRX mechanisms from grain boundary bulging to intragranular substructure evolution.