Permeability for Flow of Interdendritic Liquid through Dendritic Networks

这项建议探讨了金属合金糊状区中的传输现象和凝固动力学。该方法对树枝间液体在固体网络中的流动进行了模拟和实验。强调的是体积比大于0.65%的高液体分数和相关的对流流动。目标是确定渗透率，并将其与微观结构长度尺度和液体体积分数相关联。柱状和等轴结构的渗透率是通过模拟实际树枝状网络中的曲折流动来确定的，这是通过对铸造结构的图像分析来记录的。该模型利用了有限元模型代码。%这项研究提供了一种获得枝晶凝固过程建模所需的渗透率值的方法。建模对于了解铸件的凝固过程和最大限度地减少铸件中的宏观偏析很重要。

This proposal explores transport phenomena and dynamics of solidification in mushy zones of metal alloys. The approach employs both modelling and experimentation on the flow of interdendritic liquid through solid networks. Emphasized are high liquid fractions greater than 0.65% by volume and the associated convective flow. The goals are to determine permeability and correlate it with a microstructural length scale and the volume fraction liquid. Permeability for columnar and equiaxed structures are determined by simulating tortuous flow through actual dendritic networks that are documented by image analysis of the cast structures. The modelling makes use of finite element modelling codes. %%% This research provides an approach to obtaining permeability values needed for the modelling of dendritic solidification processes. Modelling is important for understanding solidification processes and minimizing macrosegregation in castings.