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<p>This work studies the impact of the carbon diffusion on the growth kinetics of austenite and the solute segregation, by utilizing the phase-field (PF) method to simulate the solidification of a Fe–C binary alloy. It is revealed that increasing the ratio of the carbon diffusion coefficient in solid to that in liquid is advantageous in reducing the solute segregation, and a novel microsegregation model is developed based on the quantitative analysis of the results from PF simulations. The simplified one-dimensional diffusion simulation is employed to analyse the quantitative relationship between the parameters of the proposed microsegregation model and the properties of materials. The universality and reliability of the new microsegregation model are then validated by comparing with the experimental data of various alloy systems. These findings contribute to our comprehension of the fundamental theory of solidification and also provide a potential and promising approach to controlling the solidification microstructure.</p>

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Modelling Microsegregation of Binary Alloy During Solidification

  • 期刊论文

  • 发表日期：

    2025年6月4日

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  • Tongzhao Gong,
  • Shuting Cao,
  • Weiye Hao,
  • Weiqi Fan,
  • Yun Chen,
  • Xing-Qiu Chen,
  • Dianzhong Li

摘要

This work studies the impact of the carbon diffusion on the growth kinetics of austenite and the solute segregation, by utilizing the phase-field (PF) method to simulate the solidification of a Fe–C binary alloy. It is revealed that increasing the ratio of the carbon diffusion coefficient in solid to that in liquid is advantageous in reducing the solute segregation, and a novel microsegregation model is developed based on the quantitative analysis of the results from PF simulations. The simplified one-dimensional diffusion simulation is employed to analyse the quantitative relationship between the parameters of the proposed microsegregation model and the properties of materials. The universality and reliability of the new microsegregation model are then validated by comparing with the experimental data of various alloy systems. These findings contribute to our comprehension of the fundamental theory of solidification and also provide a potential and promising approach to controlling the solidification microstructure.