Numerical modeling of crystal growth of a nickel-based superalloy with applied direct current
文献类型：期刊论文
| 作者 | X. H. Feng ; Y. S. Yang |
| 刊名 | Journal of Crystal Growth
 |
| 出版日期 | 2011 |
| 卷号 | 334期号:1页码:170-176 |
| 关键词 | Growth models Directional solidification Joule heat Electromagnetic flow Direct current binary metal alloy electric-current morphological stability interface demarcation dendritic growth melt interface magnetic-field solidification bismuth liquid |
| ISSN号 | 0022-0248 |
| 中文摘要 | A cellular automaton-finite difference (CA-FD) model is developed to simulate crystal growth with applied direct current (DC) in this study. The simulated dendrite growth is controlled by the CA rules that involved the effects of the supercooling, interfacial curvature and crystal anisotropy. The electric current distribution, the temperature field and the electromagnetic flow caused by the Lorentz force are solved by the FD calculation. The directional solidification of a model nickel-based superalloy with DC field is simulated. The results show that Joule heat brought by electric current delays the dendrite growth and changes the primary dendrite arm spacing (PDAS). Excessive Joule heat will completely stop the crystal growth. The maximum allowable current intensity increases with the cooling efficiency of directional solidification. It is found that the dendrites growing with the DC field have a self-adjustment ability to achieve flat S/L interface in macroscale during directional solidification. The electromagnetic flow induced by the DC field may theoretically accelerate the dendrite growth, but usually the influence is negligible for the directional solidification of the superalloy. (C) 2011 Elsevier B.V. All rights reserved. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/30330]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | X. H. Feng,Y. S. Yang. Numerical modeling of crystal growth of a nickel-based superalloy with applied direct current[J]. Journal of Crystal Growth,2011,334(1):170-176. |
| APA | X. H. Feng,&Y. S. Yang.(2011).Numerical modeling of crystal growth of a nickel-based superalloy with applied direct current.Journal of Crystal Growth,334(1),170-176. |
| MLA | X. H. Feng,et al."Numerical modeling of crystal growth of a nickel-based superalloy with applied direct current".Journal of Crystal Growth 334.1(2011):170-176. |
入库方式： OAI收割
来源：金属研究所
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