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<p>To optimize the microstructure and reduce deformation inhomogeneity as well as interphase stress concentration in super duplex stainless steel 2507 (SDSS 2507), its hot deformation behavior was systematically studied using a Gleeble-3800 thermomechanical simulator within the temperature range of 1273–1473&#xa0;K and strain rate range of 0.001–10&#xa0;s<sup>−1</sup>, respectively. The corrected flow stress curves exhibited typical dynamic recrystallization (DRX) characteristics, with flow stress increasing as temperature decreased or strain rate increased. A strain-compensated Arrhenius constitutive model that incorporates temperature and friction corrections was established and showed excellent predictive accuracy, yielding a correlation coefficient (R) of 99.4%. Microstructural analysis revealed that DRX occurs predominantly in the ferrite phase, whereas the austenite phase undergoes primarily dynamic recovery (DRV). Increasing temperature promotes the transformation of austenite to ferrite, facilitates the formation of low-angle grain boundaries (LAGBs) in ferrite, and accelerates both spheroidization and DRX in austenite. Higher strain rates refine the grains of both phases, improve microstructural homogeneity, and influence grain boundary evolution. During hot deformation, continuous DRX (CDRX) dominates in ferrite, while discontinuous DRX (DDRX) prevails in austenite. Both decreasing temperature and increasing strain rate enhance CDRX in ferrite while suppressing DDRX in austenite.</p>

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Microstructural evolution and dynamic recrystallization behavior of super duplex stainless steel 2507 during hot deformation

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Hui Li,
  • Qidong Nie,
  • Xiang Wang,
  • Ruiheng Li,
  • Minghui Cheng,
  • Peng Jia

摘要

To optimize the microstructure and reduce deformation inhomogeneity as well as interphase stress concentration in super duplex stainless steel 2507 (SDSS 2507), its hot deformation behavior was systematically studied using a Gleeble-3800 thermomechanical simulator within the temperature range of 1273–1473 K and strain rate range of 0.001–10 s−1, respectively. The corrected flow stress curves exhibited typical dynamic recrystallization (DRX) characteristics, with flow stress increasing as temperature decreased or strain rate increased. A strain-compensated Arrhenius constitutive model that incorporates temperature and friction corrections was established and showed excellent predictive accuracy, yielding a correlation coefficient (R) of 99.4%. Microstructural analysis revealed that DRX occurs predominantly in the ferrite phase, whereas the austenite phase undergoes primarily dynamic recovery (DRV). Increasing temperature promotes the transformation of austenite to ferrite, facilitates the formation of low-angle grain boundaries (LAGBs) in ferrite, and accelerates both spheroidization and DRX in austenite. Higher strain rates refine the grains of both phases, improve microstructural homogeneity, and influence grain boundary evolution. During hot deformation, continuous DRX (CDRX) dominates in ferrite, while discontinuous DRX (DDRX) prevails in austenite. Both decreasing temperature and increasing strain rate enhance CDRX in ferrite while suppressing DDRX in austenite.