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<p>The thermal deformation behavior of the GH3625 superalloy was investigated through hot compression experiments, with true strains ranging from 0.9, temperatures between 950 and 1150&#xa0;°C, and strain rates from 0.001 to 1&#xa0;s<sup>−1</sup>. The constitutive equation of this alloy was established and the dynamic recrystallization mechanism was studied. Results indicate that at lower temperatures, the softening mechanism of the GH3625 superalloy is primarily dominated by DRV, with an increasing degree of dynamic recrystallization as the temperature rises. At higher temperatures, the dynamic recrystallization mechanism of the GH3625 alloy encompasses both continuous dynamic recrystallization and discontinuous dynamic recrystallization processes. Observations using characterization techniques such as EBSD and TEM reveal that grain boundary bulging, DRV, and progressive subgrain rotation facilitate dynamic recrystallization. The former two mechanisms belong to the discontinuous dynamic recrystallization, while the latter belongs to the continuous dynamic recrystallization.</p>

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Hot Deformation Characteristics and Dynamic Recrystallization Mechanism of GH3625 Superalloy

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Qingyang Li,
  • Jun Cai,
  • Yu Fan,
  • Hongqiang Nan,
  • Yan Yang,
  • Lin Chen,
  • Chongchong Li,
  • Yiwen Yu,
  • Xiaokang Yang,
  • Wen Wang,
  • Kuaishe Wang,
  • Bing Zhang

摘要

The thermal deformation behavior of the GH3625 superalloy was investigated through hot compression experiments, with true strains ranging from 0.9, temperatures between 950 and 1150 °C, and strain rates from 0.001 to 1 s−1. The constitutive equation of this alloy was established and the dynamic recrystallization mechanism was studied. Results indicate that at lower temperatures, the softening mechanism of the GH3625 superalloy is primarily dominated by DRV, with an increasing degree of dynamic recrystallization as the temperature rises. At higher temperatures, the dynamic recrystallization mechanism of the GH3625 alloy encompasses both continuous dynamic recrystallization and discontinuous dynamic recrystallization processes. Observations using characterization techniques such as EBSD and TEM reveal that grain boundary bulging, DRV, and progressive subgrain rotation facilitate dynamic recrystallization. The former two mechanisms belong to the discontinuous dynamic recrystallization, while the latter belongs to the continuous dynamic recrystallization.