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本文分别利用纯扩散模型、溶质边界层对流模型和强对流Scheil方程对包晶合金定向凝固过程中的带状组织、宏观偏析的形成规律以及对流效应进行系统研究,详细讨论了对流对包晶合金定向凝固过程中带状组织和宏观偏析的影响规律.与Fe-Ni包晶合金定向凝固实验结果进行对比发现,对流强度参数λ在1.7至2之间时溶质边界层对流模型预测结果与感应加热定向凝固实验结果吻合很好,说明利用该模型可以预测对流较大条件下包晶合金定向凝固过程中的组织演化和轴向宏观偏析.
In this paper, pure diffusion model, solute boundary layer convection model and strong convection Scheil equation were used to systematically study the formation of banded structure, macrosegregation and convection effect in peritectic alloy during directional solidification. The effects of convection on peritectic alloy The experimental results of directional solidification of Fe-Ni peritectic alloy show that when the convective strength parameter λ is between 1.7 and 2, the predictions of the solute boundary layer convection model and induction heating The experimental results of directional solidification agree well with each other, which shows that the model can be used to predict the microstructure evolution and axial macrosegregation during the directional solidification of the peritectic alloy with large convection.