| Structure defect prediction of single crystal turbine blade by dendrite envelope tracking model |
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| 引用本文： | 王同敏 Itsuo OHNAKA Hideyuki YASUDA 苏彦庆 郭景杰. Structure defect prediction of single crystal turbine blade by dendrite envelope tracking model[J]. 中国有色金属学会会刊, 2006, 16(B02): 582-585 |
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| 作者姓名： | 王同敏 Itsuo OHNAKA Hideyuki YASUDA 苏彦庆 郭景杰 |
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| 作者单位： | [1]School of Materials Science and Engineering; State Key Laboratory. of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian 116024, China [2]Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan [3]School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| 基金项目： | Project（ICAST No.11305054） supported by the NED0 of Japan; Subproject （5133301ZT4） supported by 973 Program; Project （20052176） supported by the Natural Science Foundation of Liaoning Province, China |
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| 摘 要： | The structure defects such as stray grains during unidirectional solidification can severely reduce the performance of single crystal turbine blades. A dendrite envelope tracking model is developed for predicting the structure defects of unidirectional solidification turbine blade. The normal vector of dendrite envelope is estimated by the gradient of dendrite volume fraction, and the growth velocity of the dendrite envelope （dendrite tips） is calculated with considering the anisotropy of grain growth. The solute redistribution at dendrite envelope is calculated by introducing an effective solute partition coefficient. Simulation tests show that the solute-build-up due to the rejection at envelope greatly affects grain competition and consequently solidification structure. The model is applied to predict the structure defects （e.g. stray grain） of single crystal turbine blade during unidirectional solidification. The results show that the developed model is reliable and has the following abilities： reproduce the growth competition among the different-preferential-direction grains; predict the stray grain formation; simulate the structure evolution （single crystal or dendrite grains）.
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| 关 键 词： | 涡轮叶片 单晶 铸件 结构缺陷 预测 枝晶包络跟踪模型 |
| 收稿时间： | 2006-04-10 |
| 修稿时间： | 2006-04-25 |
Structure defect prediction of single crystal turbine blade by dendrite envelope tracking model |
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| WANG Tong-min, Itsuo OHNAKA, Hideyuki YASUDA, SU Yan-qing, GUO Jing-jie. Structure defect prediction of single crystal turbine blade by dendrite envelope tracking model[J]. Transactions of Nonferrous Metals Society of China, 2006, 16(B02): 582-585 |
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| Authors: | WANG Tong-min Itsuo OHNAKA Hideyuki YASUDA SU Yan-qing GUO Jing-jie |
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| Abstract: | |
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| Keywords: | turbine blade single crystal stray grain dendrite envelope tracking modeling |
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