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采用元胞自动机法(CA)计算铸锭的凝固组织,围绕宏观偏析的宏/微观耦合计算问题,针对微观组织模型的选取,本文从元胞尺度为介观(100μm×100μm)和微观(10μm×10μm)两个方面,以Al-4.7wt%Cu合金铸锭为例,分别从1能否计算出柱状晶向等轴晶转变(CET)过程;2能否计算出生长过程的二次枝晶;3能否较准确计算出晶粒的溶质分布情况;4计算效率快慢等四个方面对元胞自动机模型中的KGT模型和溶质扩散性模型进行了对比计算。结果发现,溶质扩散性模型在计算二次枝晶生长及溶质分布情况等方面有绝对优势,但其计算效率相比较而言仍待提高。
In order to solve the problem of macroscopic / microscopic coupling calculation of macrosegregation, the solidification structure of ingot was calculated by the cellular automata method (CA). According to the selection of microstructure models, 10μm × 10μm) two aspects, taking Al-4.7wt% Cu alloy ingot as an example, we can calculate the columnar to equiaxed crystal transformation (CET) process from 1; 2 can calculate the secondary growth process Dendrite; 3 can more accurately calculate the solute distribution of the grain; 4 computational efficiency of the four aspects of cellular automata model KGT model and solute diffusion model were compared. The results show that solute diffusion model has an absolute advantage in the calculation of secondary dendrite growth and solute distribution, but its computational efficiency still needs to be improved.