J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (3): 214-220.

• Reviews • 上一篇    下一篇

Modes of grain selection in spiral selector during directional solidification of nickel-base superalloys

孟祥斌1,李金国1,卢琦2,3,金涛4,孙晓峰4,张军5,Changbo Sun6,胡壮麒7   

  1. 1. 中科院金属研究所
    2. 中科院金属所
    3.
    4. 中国科学院金属研究所
    5. 西北工业大学凝固技术国家重点实验室
    6. 沈阳黎明
    7. 中国科学院金属研究所高温合金部
  • 收稿日期:2011-02-28 修回日期:2011-04-24 出版日期:2012-03-31 发布日期:2012-03-31
  • 通讯作者: 李金国
  • 基金资助:

    国家重点基础研究发展计划;国家重点基础研究发展计划;国家自然科学基金;西北工业大学凝固技术国家重点实验室开放课题

Modes of Grain Selection in Spiral Selector during Directional Solidification of Nickel-base Superalloys

Xiangbin Meng1,2), Qi Lu1,2), Jinguo Li1), Tao Jin1), Xiaofeng Sun1), Jun Zhang3), Zhongqiang Chen4), Yanhui Wang4), Zhuangqi Hu1)   

  1. 1) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
    2) Graduate School of Chinese Academy of Sciences, Beijing 100049, China
    3) State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
    4) Aviation Industry Corporation of China (AVIC) Shenyang Liming Aero-engine (Group) Corporation LTD., Shenyang 110043, China
  • Received:2011-02-28 Revised:2011-04-24 Online:2012-03-31 Published:2012-03-31
  • Supported by:

    the National Basic Research Program (973 Program) of China under Grant No. 2010CB631200 (2010CB631206), the National Natural Science Foundation of China (NSFC) under Grant No. 50801061, No. 50931004, No. 51071165 and the fund of the State Key Laboratory of Solidification Processing in NWPU under Grant No. SKLSP201112.

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摘要： The modes of grain selection in spiral selector were investigated by both a ProCAST simulation and experimental confirmation. The results show the efficiency of grain selection in starter block is associated with the geometry shape, and the optimization of grain orientation in starter block is gradually dominated by geometry shape at the later stage of grain selection. Besides, the spiral part could also optimize the selected single crystal orientation when the initial angle is large enough, and the single crystal selection in spiral parts with different initial angles is dominated by different modes. The simulation results agree well with experiments.

Abstract: The modes of grain selection in spiral selector were investigated by both a ProCAST simulation and experimental confirmation. The results show that the efficiency of grain selection in starter block is associated with the geometry shape. At the early stage of grain selection, the optimization of grain orientation is dominated by competitive grain growth, but the optimization of grain orientation in starter block is gradually dominated by geometry shape at the later stage of grain selection. Besides, the spiral part could also optimize the orientation of the selected single crystal when the initial angle is large enough, and the single crystal selection in spiral parts with different pitch lengths and initial angles is dominated by different modes. The simulation results agree well with experimental ones.

Key words: Ni-base single crystal superalloys, Competitive grain growth, Geometry shape, Directional solidification, Spiral selector