Cellular Automaton Simulation of the Semi-Solid Structure Evolution in LSPWES Method

Ma Deqing; Yang Xiaorong; Zheng Jiabin; Mao Weimin

doi:10.15980/j.tzzz.2014.06.017

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Cellular Automaton Simulation of the Semi-Solid Structure Evolution in LSPWES Method
Vol. 34, Issue 6, Pages: 613-617(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.06.017

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[1]马德清,杨小容,郑嘉斌,毛卫民.LSPWES法半固态组织演化的元胞自动机模拟[J].特种铸造及有色合金,2014,34(06):613-617.

Ma Deqing, Yang Xiaorong, Zheng Jiabin, et al. Cellular Automaton Simulation of the Semi-Solid Structure Evolution in LSPWES Method. [J]. Special Casting & Nonferrous Alloys 34(6):613-617(2014)
[1]马德清,杨小容,郑嘉斌,毛卫民.LSPWES法半固态组织演化的元胞自动机模拟[J].特种铸造及有色合金,2014,34(06):613-617. DOI： 10.15980/j.tzzz.2014.06.017.

Ma Deqing, Yang Xiaorong, Zheng Jiabin, et al. Cellular Automaton Simulation of the Semi-Solid Structure Evolution in LSPWES Method. [J]. Special Casting & Nonferrous Alloys 34(6):613-617(2014) DOI： 10.15980/j.tzzz.2014.06.017.

摘要

为理解低过热度浇注弱电磁搅拌（LSPWES）过程中铝合金半固态球晶组织形成的基本规律和演化机制

建立了元胞自动机（Cellular Automaton）和有限元（Finite Element）相结合的宏微观耦合模型

并分析了电磁搅拌对凝固过程的影响

计算了不同搅拌参数下的流场信息

模拟了该方法中不同工艺参数下A356铝合金的凝固组织

得到了最佳的工艺参数。模拟和试验结果表明

当浇注温度为630℃时

施加短时弱电磁搅拌后

增大了形核率

使同时发生凝固的区域增大

提高了晶粒在各个方向上生长的均匀性

促进了球晶组织的形成。此时

最佳搅拌参数:电源频率为10Hz

搅拌功率为1.2kW

搅拌时间为6s。

Abstract

A CA-FE model in which the influence of electromagnetic stiring was taken into account was established by the coupling of finite element and cellular automaton to understand the basic formation mechanism and evolution mechanism of the semi-solid aluminum alloy under LSPWES（low superheat pouring and weak electromagnetic stirring）method.The flow distribution and A356solidification structure at different stirring parameters were simulated.The results show that a weak electromagnetic stirring can increase the rate of nucleation

enlarge the solidification region

improve the uniformity of the grain growth in all directions and promote the formation of globular structure with the pouring at 630℃.The optimized stirring parameters are presented as follows:power frequency of 10Hz

stirring power of 1.2kW and the stirring time of 6s.