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Metallurgical and Materials Transactions A

, Volume 43, Issue 10, pp 3767–3775 | Cite as

Grain Selection During Casting Ni-Base, Single-Crystal Superalloys with Spiral Grain Selector

  • S. F. Gao
  • L. Liu
  • N. Wang
  • X. B. Zhao
  • J. Zhang
  • H. Z. Fu
Article

Abstract

The behavior of grain selection in a spiral grain selector during investment casting of a Ni-base, single-crystal (SX) superalloy, DD3, has been investigated by electron backscattered diffraction (EBSD) techniques and optical microscopy. The results indicated that the main function of starter block is to optimize the crystal orientation. During the process of grain selection in spiral passage, the grain near the inner wall of spiral passage was usually selected as the final single crystal. It was found that the dendrites near the inner wall could develop new tertiary dendritic arms that paralleled the primary dendrites from the secondary dendritic arms to overgrow the dendrites far away from the inner wall. The crystal orientation that was examined by X-ray diffraction revealed that (1) the crystal orientation did not change obviously with increasing spiral thickness or angle and (2) the crystal orientation could be optimized by increasing the withdrawal rate and ceramic mold temperature. The influence of pouring temperature on crystal orientation was also discussed.

Keywords

Directional Solidification Crystal Orientation Withdrawal Rate Grain Texture Ceramic Mold 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors are grateful to the financial support of the National Basic Research Program of China (Nos. 2010CB631202 and 2011CB610406), the National Natural Science Foundation of China (Nos. 50827102, 50931004 and 51171151), the Aeronautical Science Foundation of China (No. 2010ZE53048), the China Postdoctoral Science Foundation funded project (No. 20100481361), and the Research Fund of the State Key Laboratory of Solidification Processing (No. 09-BZ-2010).

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2012

Authors and Affiliations

  • S. F. Gao
    • 1
  • L. Liu
    • 1
  • N. Wang
    • 1
  • X. B. Zhao
    • 1
  • J. Zhang
    • 1
  • H. Z. Fu
    • 1
  1. 1.State Key Laboratory of Solidification Processing, Northwestern Polytechnical UniversityXi’anP.R. China

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