Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第21卷    第9期    总第150期    2011年9月

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文章编号:1004-0609(2011)09-2195-07
Al-Cu合金凝固微观组织的三维模拟及优化
卜晓兵1, 2, 李落星1, 2, 张立强2, 朱必武2, 王水平2

(1. 湖南大学 汽车车身先进设计与制造国家重点实验室,长沙 410082;
2. 湖南大学 材料科学与工程学院,长沙 410082
)

摘 要: 采用CA-FE模型,对同一铸件不同尺寸的Al-2%Cu合金凝固微观组织进行三维模拟及预测,并引入空位形成能对固相扩散系数进行了优化。结果表明,当铸件直径分别为20、40和60 mm时,柱状晶占总晶体比率分别为65.2%、52.1%和21.4%,逐渐减少,而等轴晶所占比率逐渐增加;当换热系数由500 W/(m2·K)增大到5 000 W/(m2·K)时,同一铸件中不同直径的铸件凝固组织中柱状晶组织比例显著增大。模拟结果与实验结果吻合较好,能够较为准确地反映等轴晶和柱状晶的分布位置、比例和大小。

 

关键字: Al-Cu合金;3D元胞自动机;固相,扩散系数;凝固组织

Three-dimensional numerical simulation and optimization of
solidification structure of Al-Cu alloy
BU Xiao-bing1, 2, LI Luo-xing1, 2, ZHANG Li-qiang2, ZHU Bi-wu2, WANG Shui-ping2

1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,
Hunan University, Changsha 410082, China;
2. College of Materials Science and Engineering, Hunan University, Changsha 410082, China

Abstract:A 3D cellular automaton-finite element (CA-FE) method was used to predict the solidification structure of Al-Cu alloy at different casting radii, and optimized the solution diffusion coefficient in solid phase. The results show that when the casting radius changes from 10 mm to 30 mm, the proportion of columnar grains changes from 65.2% to 21.4%. With increasing heat transfer coefficient from 500 W/(m2·K) to 5 000 W/(m2·K), the proportion of columnar grains also gradually increases. The simulated results are in accord with the experimental ones well, and can accurately reflect the distribution, proportion, size of equiaxed and columnar grains.

 

Key words: Al-Cu alloy; 3D cellular automation method; solid phase; solution diffusion coefficient; solidification structure

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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