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<p>Grain growth models play a crucial role in optimizing process parameters. This study proposes a grain growth model for GH625 alloy across a wide temperature range. Heat treatment experiments were conducted within a temperature range of 1123-1493&#xa0;K, withholding times ranging from the 1800 s to 9000&#xa0;s. The effects of holding time and temperature on grain growth behavior were investigated. The results indicate that with an increase in both holding time and temperature, the grain size of the GH625 alloy increases. Grain normal growth occurs within the temperature range of 1123-1323&#xa0;K, while abnormal growth is observed between 1423&#xa0;K and 1493&#xa0;K. The average grain sizes of the GH625 alloy under various experimental conditions were calculated. A modified grain growth model was proposed to enhance the model’s predictability concerning grain growth behavior across a wide temperature range. The Sellars–Anelli model, BP-ANN model, and the modified grain growth model were established based on the experimental data. The new model exhibits a superior correlation (0.99854) and a minor average relative error (2.20%) compared to the Sellars–Anelli and BP-ANN models. Evaluation results demonstrate that the constructed grain growth model provides high predictive accuracy in characterizing the grain growth behavior of GH625 alloy.</p>

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A Grain Growth Model for GH625 Alloy with Wide Temperature Range

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Liqun Niu,
  • Kaixiong Cheng,
  • Xuming Wang,
  • Bingzheng Wang,
  • Quanzhen Sun,
  • Shengmao Dong,
  • Zhenglong Liang

摘要

Grain growth models play a crucial role in optimizing process parameters. This study proposes a grain growth model for GH625 alloy across a wide temperature range. Heat treatment experiments were conducted within a temperature range of 1123-1493 K, withholding times ranging from the 1800 s to 9000 s. The effects of holding time and temperature on grain growth behavior were investigated. The results indicate that with an increase in both holding time and temperature, the grain size of the GH625 alloy increases. Grain normal growth occurs within the temperature range of 1123-1323 K, while abnormal growth is observed between 1423 K and 1493 K. The average grain sizes of the GH625 alloy under various experimental conditions were calculated. A modified grain growth model was proposed to enhance the model’s predictability concerning grain growth behavior across a wide temperature range. The Sellars–Anelli model, BP-ANN model, and the modified grain growth model were established based on the experimental data. The new model exhibits a superior correlation (0.99854) and a minor average relative error (2.20%) compared to the Sellars–Anelli and BP-ANN models. Evaluation results demonstrate that the constructed grain growth model provides high predictive accuracy in characterizing the grain growth behavior of GH625 alloy.