| Effect of process variables on grain growth in simulating solidification microstructure of Ti-45%Al alloy ingot by stochastic model |
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| 引用本文： | 吴士平 刘东戎 郭景杰 傅恒志. Effect of process variables on grain growth in simulating solidification microstructure of Ti-45%Al alloy ingot by stochastic model[J]. 中国有色金属学会会刊, 2005, 15(5): 1096-1102 |
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| 作者姓名： | 吴士平 刘东戎 郭景杰 傅恒志 |
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| 作者单位： | School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| 摘 要： | A comprehensive stochastic model for simulating microstructure formation of Ti-45% Al（mole fraction） alloy ingot during solidification process was developed, based on a finite differential method（FDM） for macroscopic heat flow calculation and a cellular automaton（CA） technique for microscopic modeling of nucleation and growth. The formation of a shrinkage cavity at the top of ingot was taken into account. The effects of process variables such as pouring temperature and mold-preheated temperature on the microstructure formation were investigated. The calculated results indicate that the columnar zone is expanded with increasing pouring temperature in the nonlinear way and the volume fraction of equiaxed zone only slightly varies with the mold-preheated temperature.
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| 关 键 词： | Ti-45 ％Al alloy |
| 文章编号： | 1003-6326（2005）05-1096-07 |
| 收稿时间： | 2004-12-22 |
| 修稿时间： | 2005-04-04 |
Effect of process variables on grain growth in simulating solidification microstructure of Ti-45%Al alloy ingot by stochastic model |
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| WU Shi-ping,LIU Dong-rong,GUO Jing-jie,FU Heng-zhi. Effect of process variables on grain growth in simulating solidification microstructure of Ti-45%Al alloy ingot by stochastic model[J]. Transactions of Nonferrous Metals Society of China, 2005, 15(5): 1096-1102 |
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| Authors: | WU Shi-ping LIU Dong-rong GUO Jing-jie FU Heng-zhi |
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| Abstract: | A comprehensive stochastic model for simulating microstructure formation of Ti-45 % Al(mole fraction)alloy ingot during solidification process was developed, based on a finite differential method(FDM) for macroscopic heat flow calculation and a cellular automaton(CA) technique for microscopic modeling of nucleation and growth.The formation of a shrinkage cavity at the top of ingot was taken into account. The effects of process variables such as pouring temperature and mold-preheated temperature on the microstructure formation were investigated. The calculated results indicate that the columnar zone is expanded with increasing pouring temperature in the nonlinear way and the volume fraction of equiaxed zone only slightly varies with the mold-preheated temperature. |
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| Keywords: | solidification grain structure process variable cellular automaton |
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