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<p>The multi-pass thermal compression behavior of GH4698 nickel-base superalloy was examined. Thermal compression experiments of single-pass, double-pass, and triple-pass were conducted at deformation temperatures of 1000 °C, 1040 °C, and 1080 °C, strain rates of 0.01 s<sup>−1</sup>, 0.1 s<sup>−1</sup>, and 1 s<sup>−1</sup>, and total deformation amount of 60%. Recrystallization behavior and the impact of deformation parameters on the microstructure of the GH4698 superalloy under multi-pass thermal compression have been researched. According to the results, higher second-pass deformation temperature encourages the creation of more twins, shorter holding time and multi-pass compression may successfully prevent the appearance of large grains, and lower interruption strain helps achieve more uniform and fine structure. Strain-induced boundary migration (SIBM) is one of the recrystallization nucleation mechanisms of GH4698 superalloy during multi-pass thermal compression, while Continuous Dynamic Recrystallization (CDRX) only plays an auxiliary role in the continuous deformation of GH4698 superalloy. Furthermore, the recrystallization nucleation process is impacted by the Σ3 twin boundary, and T-DDRX and T-CDRX mechanisms may be present.</p>

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Deformation behavior and microstructure evolution of GH4698 nickel-based superalloy in multi-pass thermal compression

  • 期刊论文

  • 发表日期：

    2025年8月22日

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  • Na Li,
  • Shichang Qiao,
  • Xinyu Gao,
  • Fengzhen Wang,
  • Xin Wen,
  • Zhikang Xia,
  • Yongqiang Wang,
  • Shuai Liu,
  • Jinzhe Jiang,
  • Chao Yuan,
  • Yuanbao Shi

摘要

The multi-pass thermal compression behavior of GH4698 nickel-base superalloy was examined. Thermal compression experiments of single-pass, double-pass, and triple-pass were conducted at deformation temperatures of 1000 °C, 1040 °C, and 1080 °C, strain rates of 0.01 s−1, 0.1 s−1, and 1 s−1, and total deformation amount of 60%. Recrystallization behavior and the impact of deformation parameters on the microstructure of the GH4698 superalloy under multi-pass thermal compression have been researched. According to the results, higher second-pass deformation temperature encourages the creation of more twins, shorter holding time and multi-pass compression may successfully prevent the appearance of large grains, and lower interruption strain helps achieve more uniform and fine structure. Strain-induced boundary migration (SIBM) is one of the recrystallization nucleation mechanisms of GH4698 superalloy during multi-pass thermal compression, while Continuous Dynamic Recrystallization (CDRX) only plays an auxiliary role in the continuous deformation of GH4698 superalloy. Furthermore, the recrystallization nucleation process is impacted by the Σ3 twin boundary, and T-DDRX and T-CDRX mechanisms may be present.