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<p>This study investigated the microstructure evolution and DRX mechanism during the hot deformation of an as-cast Ni–Co–Cr-based precipitation–hardening superalloy, specifically Udimet720Li. Thermal simulation compression tests were conducted at two temperatures of 1050&#xa0;°C and 1150&#xa0;°C, with varying strains to analyze the microstructure evolution. A CA model was established to simulate the influence of hot deformation parameters on the microstructure of the alloy during the DRX process. EBSD and TEM were employed to investigate the microstructure evolution and the nucleation mechanisms of DRX at 1050&#xa0;°C and 1150&#xa0;°C. The results indicated that at the lower temperature (1050&#xa0;°C), fine DRX grains tended to cluster at the initial grain boundaries under low strain, with DRX gradually increasing with strain. Conversely, at the higher temperature (1150&#xa0;°C), DRX grains formed a necklace-like distribution, thereby achieving a more homogeneous microstructure at high strain. The CA model simulations of the microstructure evolution correlated with the experimental results. Finally, it was observed that both DDRX and CDRX occurred at the lower temperature, with DDRX being the dominant mechanism. At the higher temperature, DDRX, characterized by grain boundary bulging, predominated the DRX process, while the overall contribution of CDRX decreased. The findings of this study are helpful to understand the microstructure evolution and DRX mechanism of as-cast Udimet720Li alloy during hot forming process, and provide a model for the simulation and prediction of microstructure, which provides a basis for the precise control of microstructure during hot-working process.</p>

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Microstructure Evolution and Dynamic Recrystallization Mechanisms During Hot Deformation of As-Cast Udimet720Li Superalloy

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • Lei Sha,
  • Bingbing Wang,
  • Xiaokang Chen,
  • Kangdi Zhong,
  • Zongjie Zhou,
  • Lian Xue,
  • Xiaoning Wang

摘要

This study investigated the microstructure evolution and DRX mechanism during the hot deformation of an as-cast Ni–Co–Cr-based precipitation–hardening superalloy, specifically Udimet720Li. Thermal simulation compression tests were conducted at two temperatures of 1050 °C and 1150 °C, with varying strains to analyze the microstructure evolution. A CA model was established to simulate the influence of hot deformation parameters on the microstructure of the alloy during the DRX process. EBSD and TEM were employed to investigate the microstructure evolution and the nucleation mechanisms of DRX at 1050 °C and 1150 °C. The results indicated that at the lower temperature (1050 °C), fine DRX grains tended to cluster at the initial grain boundaries under low strain, with DRX gradually increasing with strain. Conversely, at the higher temperature (1150 °C), DRX grains formed a necklace-like distribution, thereby achieving a more homogeneous microstructure at high strain. The CA model simulations of the microstructure evolution correlated with the experimental results. Finally, it was observed that both DDRX and CDRX occurred at the lower temperature, with DDRX being the dominant mechanism. At the higher temperature, DDRX, characterized by grain boundary bulging, predominated the DRX process, while the overall contribution of CDRX decreased. The findings of this study are helpful to understand the microstructure evolution and DRX mechanism of as-cast Udimet720Li alloy during hot forming process, and provide a model for the simulation and prediction of microstructure, which provides a basis for the precise control of microstructure during hot-working process.