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<p>The hot deformation behavior of Incoloy 825 nickel-based superalloy is investigated through uniaxial hot compression tests at a strain rate of 1&#xa0;s<sup>−1</sup> and different temperatures with a true strain of 0.69. Electron backscatter diffraction and transmission electron microscopy techniques are employed to analyze the effects of different deformation temperatures on the microstructure evolution, subgrain structure, and dynamic recrystallization (DRX) mechanisms in the as-cast Incoloy 825 alloy. The results indicate that higher deformation temperatures promote DRX nucleation, with the DRX fraction and average grain size increasing significantly as temperature rises, and alloy properties are enhanced. Microstructure analysis revealed that discontinuous dynamic recrystallization, characterized by grain boundary bulging and serrated grain boundaries, is the primary nucleation mechanism. Continuous dynamic recrystallization, characterized by subgrain rotation is more likely to occur at lower temperatures.</p>

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Microstructure Evolution and Dynamic Recrystallization Mechanisms During Hot Deformation of Cast Incoloy 825 Alloy

  • 期刊论文

  • 发表日期：

    2025年1月11日

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  • Yinming Li,
  • Zhi Jia,
  • Min Yang,
  • Chi Zhang,
  • Chengwei Liang,
  • Liping Chen,
  • Xuming Wang,
  • Fuqiang Chang

摘要

The hot deformation behavior of Incoloy 825 nickel-based superalloy is investigated through uniaxial hot compression tests at a strain rate of 1 s−1 and different temperatures with a true strain of 0.69. Electron backscatter diffraction and transmission electron microscopy techniques are employed to analyze the effects of different deformation temperatures on the microstructure evolution, subgrain structure, and dynamic recrystallization (DRX) mechanisms in the as-cast Incoloy 825 alloy. The results indicate that higher deformation temperatures promote DRX nucleation, with the DRX fraction and average grain size increasing significantly as temperature rises, and alloy properties are enhanced. Microstructure analysis revealed that discontinuous dynamic recrystallization, characterized by grain boundary bulging and serrated grain boundaries, is the primary nucleation mechanism. Continuous dynamic recrystallization, characterized by subgrain rotation is more likely to occur at lower temperatures.