基于Wheeler等提出的纯扩散相场模型,建立耦合溶质场、温度场和流场的相场模型,采用有限差分法对控制方程进行数值求解,研究Ni-Cu合金凝固过程中单晶粒枝晶和多晶粒枝晶在强制对流作用下的生长行为.结果表明:熔体的流动显著改变凝固前沿的传热和传质,从而改变枝晶的生长行为.在流速为6.43 m/s的垂直强制对流作用下,上游枝晶受过冷熔体冲刷,枝晶尖端溶质浓度和温度低,实际过冷度大,枝晶生长迅速,稳态生长速度比纯扩散时增加28%;热量和溶质在下游富集,下游枝晶尖端溶质浓度和温度高,实际过冷度小,枝晶生长缓慢,稳态生长速度比纯扩散时减小26%.
参考文献
| [1] | H.-J. DIEPERS;C. BECKERMANN;I. STEINBACH .SIMULATION OF CONVECTION AND RIPENING IN A BINARY ALLOY MUSH USING THE PHASE-FIELD METHOD[J].Acta materialia,1999(13):3663-3678. |
| [2] | Tonhardt R.;Amberg G. .Dendritic growth of randomly oriented nuclei in a shear flow[J].Journal of Crystal Growth,2000(1/2):161-187. |
| [3] | Tonhardt R.;Amberg G. .Phase-field simulation of dendritic growth in a shear flow[J].Journal of Crystal Growth,1998(3/4):406-425. |
| [4] | Jeong JH.;Dantzig JA.;Goldenfeld N. .Phase field model for three-dimensional dendritic growth with fluid flow - art. no. 041602[J].Physical review.E.Statistical physics, plasmas, fluids, and related interdisciplinary topics,2001(4 Pt.1):1602-0. |
| [5] | AL-RAWAHI N;TRYGGASON G .Numerical simulation of dendritic solidification with convection:Two-dimensional geometry[J].Journal of Computational Physics,2002,180:471-496. |
| [6] | Zhu MF;Lee SY;Hong CP .Modified cellular automaton model for the prediction of dendritic growth with melt convection[J].Physical review, E. Statistical, nonlinear, and soft matter physics,2004(6 Pt.1):1610-1-1610-12-0. |
| [7] | 朱鸣芳,戴挺,李成允,洪俊杓.对流作用下枝晶生长行为的数值模拟[J].中国科学E辑,2005(07):673-688. |
| [8] | Miller W.;Mansutti D.;Succi S. .Lattice Boltzmann model for anisotropic liquid-solid phase transition[J].Physical review letters,2001(16):3578-3581. |
| [9] | Miller W.;Succi S. .A lattice Boltzmann model for anisotropic crystal growth from melt[J].Journal of Statistical Physics,2002(1/2):173-186. |
| [10] | 孙东科;朱鸣芳 .CA-LB模型模拟对流枝晶生长[J].中国有色金属学报,2007,17(z1):84-89. |
| [11] | 杨朝蓉,孙东科,潘诗琰,戴挺,朱鸣芳.CA-LBM模型模拟自然对流作用下的枝晶生长[J].金属学报,2009(01):43-50. |
| [12] | Tong X.;Karma A.;Beckermann C. .Velocity and shape selection of dendritic crystals in a forced flow[J].Physical review.E.Statistical physics, plasmas, fluids, and related interdisciplinary topics,2000(1):R49-R52. |
| [13] | 赵代平,荆涛,柳百成.相场方法模拟铝合金三维枝晶生长[J].物理学报,2003(07):1737-1742. |
| [14] | 于艳梅,杨根仓,赵达文,吕衣礼,A.Karma,C.Beckermann.过冷熔体中枝晶生长的相场法数值模拟[J].物理学报,2001(12):2423-2428. |
| [15] | 龙文元,蔡启舟,陈立亮,魏伯康.二元合金等温凝固过程的相场模型[J].物理学报,2005(01):256-262. |
| [16] | 陈玉娟,陈长乐.相场法模拟对流速度对上游枝晶生长的影响[J].物理学报,2008(07):4585-4589. |
| [17] | 邱文旭,陈长乐,马强,张利学.对流下二元合金等温凝固过程的相场模拟[J].铸造,2009(03):241-244,248. |
| [18] | WHEELER A A;MURRAY B T;SCHAEFER R J .Computation of dendrites using a phase field model[J].Physical Review D,1993,66(1/2):243-262. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%