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<p>The hot deformation behavior and microstructure evolution of a GH4698 Ni-14Cr-2.6Ti-1.7Al-2.9Mo-2.1Nb superalloy was investigated through isothermal compression tests. A strain-compensated constitutive equation was established to reliably effectively flow stress behavior. The microstructural evolution under different deformation conditions was systematically analyzed, revealing distinct dynamic recrystallization pathways. At low temperatures, both discontinuous dynamic recrystallization (DDRX) via grain boundary bulging and continuous dynamic recrystallization (DRX) via subgrain rotation were active. As the temperature increases, twin boundary–assisted recrystallization at low-energy interfaces in GH4698 alloy is activated, providing an additional nucleation route. In addition, this work reports for the first time that low temperature deformation in GH4698 alloy leads to the formation of step-shaped grain boundaries. These boundaries serve as low-energy migration paths, which significantly facilitate grain boundary movement. These findings provide new mechanistic insights into DRX in Ni–Cr superalloys and establish a framework for optimizing thermoplastic processing of advanced aerospace alloys.</p> Graphical abstract <p></p>

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Microstructural Characteristics, Dynamic Recrystallization, and Hot Deformation Behavior of Ni-Cr Superalloy Under Thermoplastic Deformation

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Yijie Ban,
  • Changmin Li,
  • Binhui Xing,
  • Kezhuo Liu,
  • Wenjie Mao,
  • Renhao Wu,
  • Qingfeng Wu,
  • Shoulei Gao,
  • Liang Huang,
  • Hyoung Seop Kim

摘要

The hot deformation behavior and microstructure evolution of a GH4698 Ni-14Cr-2.6Ti-1.7Al-2.9Mo-2.1Nb superalloy was investigated through isothermal compression tests. A strain-compensated constitutive equation was established to reliably effectively flow stress behavior. The microstructural evolution under different deformation conditions was systematically analyzed, revealing distinct dynamic recrystallization pathways. At low temperatures, both discontinuous dynamic recrystallization (DDRX) via grain boundary bulging and continuous dynamic recrystallization (DRX) via subgrain rotation were active. As the temperature increases, twin boundary–assisted recrystallization at low-energy interfaces in GH4698 alloy is activated, providing an additional nucleation route. In addition, this work reports for the first time that low temperature deformation in GH4698 alloy leads to the formation of step-shaped grain boundaries. These boundaries serve as low-energy migration paths, which significantly facilitate grain boundary movement. These findings provide new mechanistic insights into DRX in Ni–Cr superalloys and establish a framework for optimizing thermoplastic processing of advanced aerospace alloys.

Graphical abstract