摘要
建立了有限元(Finite Element)和元胞自动机法(Cellular Automaton)相结合的宏微观耦合的CA-FE模型,实现了电磁搅拌作用下Al-5%Cu合金凝固组织的数值模拟。该模型利用ANSYS软件计算电磁力,利用有限差分法计算宏观流场和温度场。在微观计算中,采用基于高斯分布的连续形核模型,并采用KGT生长模型计算枝晶尖端生长速率。模拟和实验结果表明,施加电磁搅拌后,铝合金的温度场均匀,冷却速率加快,利于组织细化。
A CA-FE model based on finite element and cellular automaton method, coupling a macro-micro-scopic temperature field and flow field analysis under electromagnetic stirring, was developed. The dynamic evolution of solidification grain structure of A1-5wt%Cu alloy were presented successfully. The magnetic forces, influencing flow field and temperature field of the melt, were calculated with ANSYS 10.0 solfware. The Gaussian distribution was chosen to deal with nucleation events both on the mold wall and in the bulk melt. The KGT （Kurz-Giovanola-Trivedi） model, based on the calculated temperature field, was adopted to evaluate the growth velocity of a dendrite tip. Both the computational and experimental results show that grain refinement is improved remarkably under electromagnetic stirring.
出处
《铸造技术》
CAS
北大核心
2012年第3期280-284,共5页
Foundry Technology
关键词
电磁搅拌
元胞自动机法
有限元
Al-5%Cu合金
形核
高斯分布
KGT模型
electromagnetic stirring
cellular automaton method
finite element
A1-5%Cu alloy
nucleation
gaussian distribution
KGT model
