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

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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.

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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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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, P.R. China

    S. F. Gao (Doctoral Candidate of Materials Science), L. Liu (Professor), N. Wang (Master’s Degree Candidate), X. B. Zhao (Postdoctor), J. Zhang (Professor) & H. Z. Fu (Professor)

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  1. S. F. Gao
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  2. L. Liu
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  3. N. Wang
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  4. X. B. Zhao
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Correspondence to L. Liu.

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Manuscript submitted July 22, 2011.

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Gao, S.F., Liu, L., Wang, N. et al. Grain Selection During Casting Ni-Base, Single-Crystal Superalloys with Spiral Grain Selector. Metall Mater Trans A 43, 3767–3775 (2012). https://doi.org/10.1007/s11661-012-1165-x

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