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<p>The hot deformation behavior and microstructural evolution of an Fe–13Cr–4.5Al–2Mo–0.6Nb–0.6Ti alloy were systematically investigated using isothermal compression tests. Dynamic recrystallization mechanisms and their influencing factors during high-temperature deformation were elucidated based on scanning electron microscope, electron backscatter diffraction, and transmission electron microscope (TEM) observations. Results reveal that discontinuous dynamic recrystallization (DDRX), continuous dynamic recrystallization (CDRX), and geometric dynamic recrystallization (GDRX) coexist under certain conditions, with their relative contributions depending on temperature and strain rate. At 900&#xa0;°C, lower strain rates promote the transformation from dynamic recovery to CDRX, while higher strain rates favor DDRX nucleation. At 1200&#xa0;°C, DDRX and CDRX dominate due to enhanced grain boundary mobility and reduced pinning from dissolved Laves phases, resulting in larger recrystallized grains. The microstructure exhibits γ-fiber and θ-fiber textures, where strain-induced boundary migration between these fibers facilitates DDRX, and θ-fiber grains are more prone to GDRX. TEM analysis confirms the formation of nanoscale C14-type hexagonal Laves phases containing Nb, Ti, and Mo, which effectively inhibit subgrain growth and abnormal grain coarsening through strong dislocation pinning, thereby stabilizing the microstructure. Notably, the fine and uniformly dispersed Laves phases at 900&#xa0;°C contribute to refined grain structures, enhancing mechanical properties and thermal stability.</p>

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Hot deformation behavior and dynamic recrystallization mechanisms of Fe–Cr–Al–Mo–Nb–Ti alloy

  • 期刊论文

  • 发表日期：

    2026年3月24日

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  • Ye Liu,
  • Wen-Zhuo Xiao,
  • Pei-Nan Du,
  • Lin Zhang,
  • Jie-Ming Tian,
  • Shuang He,
  • Xu Chen,
  • Oleg-I. Gorbatov,
  • Xuan-Hui Qu

摘要

The hot deformation behavior and microstructural evolution of an Fe–13Cr–4.5Al–2Mo–0.6Nb–0.6Ti alloy were systematically investigated using isothermal compression tests. Dynamic recrystallization mechanisms and their influencing factors during high-temperature deformation were elucidated based on scanning electron microscope, electron backscatter diffraction, and transmission electron microscope (TEM) observations. Results reveal that discontinuous dynamic recrystallization (DDRX), continuous dynamic recrystallization (CDRX), and geometric dynamic recrystallization (GDRX) coexist under certain conditions, with their relative contributions depending on temperature and strain rate. At 900 °C, lower strain rates promote the transformation from dynamic recovery to CDRX, while higher strain rates favor DDRX nucleation. At 1200 °C, DDRX and CDRX dominate due to enhanced grain boundary mobility and reduced pinning from dissolved Laves phases, resulting in larger recrystallized grains. The microstructure exhibits γ-fiber and θ-fiber textures, where strain-induced boundary migration between these fibers facilitates DDRX, and θ-fiber grains are more prone to GDRX. TEM analysis confirms the formation of nanoscale C14-type hexagonal Laves phases containing Nb, Ti, and Mo, which effectively inhibit subgrain growth and abnormal grain coarsening through strong dislocation pinning, thereby stabilizing the microstructure. Notably, the fine and uniformly dispersed Laves phases at 900 °C contribute to refined grain structures, enhancing mechanical properties and thermal stability.