Permeability for Flow of Interdendritic Liquid through Dendritic Networks

该提案探讨了运输现象和动力学的 在金属合金的糊状区凝固。 的方法 采用模拟和实验的流动， 枝晶间液体通过固体网络。 强调的是高 大于0.65体积%的液体馏分和相关的 对流 目标是确定渗透率， 将其与显微结构长度尺度和体积相关联 馏分液体。 柱状和等轴结构的渗透性 通过模拟实际树枝状的曲折流动来确定 通过演员的图像分析记录的网络 结构. 建模使用有限元建模 代码. %%% 该研究提供了一种获得渗透率值的方法 枝晶凝固过程建模所需的。 模拟对于理解凝固过程是很重要的 并使铸件中的宏观偏析最小化。

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.