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材料工程  2014, Vol. 0 Issue (11): 15-22    DOI: 10.11868/j.issn.1001-4381.2014.11.003
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
DD6单晶精铸薄壁试样定向凝固过程数值模拟
杨亮, 李嘉荣, 金海鹏, 谢洪吉, 韩梅, 刘世忠
北京航空材料研究院 先进高温结构材料重点实验室, 北京 100095
Numerical Simulation on Directional Solidification Process of DD6 Single Crystal Superalloy Thin-walled Specimen
YANG Liang, LI Jia-rong, JIN Hai-peng, XIE Hong-ji, HAN Mei, LIU Shi-zhong
Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China
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摘要 针对单晶高温合金精铸薄壁试样制备困难的问题,建立了薄壁板形试样的有限元模型,采用ProCAST数值模拟的方法模拟DD6单晶精铸薄壁板形试样的定向凝固过程,研究了几何形状和工艺参数对定向凝固过程中温度场、温度梯度场及糊状区的影响。结果表明:薄壁板形试样中间部位工作端的温度梯度在60~65℃/cm范围内,糊状区固相线较为平直,液相线的位置在近炉壁一侧较低,远炉壁一侧较高。几何形状对单晶高温合金试样定向凝固过程有重要影响,提高浇注温度或降低抽拉速率有助于薄壁板形试样固液界面前沿液相温度梯度增大、糊状区宽度减小。单晶高温合金精铸薄壁试样定向凝固过程数值模拟结果与实际浇注结果吻合,凝固过程数值模拟为单晶精铸薄壁试样的制备提供了技术支持。
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杨亮
李嘉荣
金海鹏
谢洪吉
韩梅
刘世忠
关键词 单晶高温合金薄壁试样定向凝固数值模拟DD6    
Abstract:For the difficulty in preparation of thin-walled specimen of DD6 single crystal superalloy, the finite element model of thin-walled slab specimen was established to simulate the directional solidification process of investment casting thin-walled slab specimen using a numerical simulation software ProCAST. The effects of specimen shape and solidification parameters on temperature field, temperature gradient field and mushy zone were investigated. The results show that temperature gradient at the working end of the thin-walled slab specimen's centre location ranges from 60℃/cm to 65℃/cm. The solidus isotherm of mushy zone is relatively flat, but liquidus isotherm closed to furnace wall is slightly lower than that far away from furnace wall. Geometrical shape has great effect on the directional solidification process of single crystal superalloy specimen. Increasing the pouring temperature or decreasing the withdrawal rate helps to increase the temperature gradient in solid/liquid interface front and reduce the mushy zone width. The numerical simulation results of the directional solidification are consistent with that of the actual casting results. The solidification simulation can provide the technical support for the preparation of thin-walled specimen.
Key wordssingle crystal superalloy    thin-walled specimen    directional solidification    numerical simulation    DD6
收稿日期: 2013-07-20      出版日期: 2014-11-20
1:  TG244  
  TG132.3  
通讯作者: 杨亮(1983-), 男, 博士, 工程师, 主要从事高温合金方面的研究工作, 联系地址:北京市81信箱1分箱(100095).     E-mail: yangliang1983@163.com
引用本文:   
杨亮, 李嘉荣, 金海鹏, 谢洪吉, 韩梅, 刘世忠. DD6单晶精铸薄壁试样定向凝固过程数值模拟[J]. 材料工程, 2014, 0(11): 15-22.
YANG Liang, LI Jia-rong, JIN Hai-peng, XIE Hong-ji, HAN Mei, LIU Shi-zhong. Numerical Simulation on Directional Solidification Process of DD6 Single Crystal Superalloy Thin-walled Specimen. Journal of Materials Engineering, 2014, 0(11): 15-22.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2014.11.003      或      http://jme.biam.ac.cn/CN/Y2014/V0/I11/15
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