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Influence of the Size Effect on the Microstructures of the DWDS- and Bridgman-Solidified Single-Crystal CMSX-4 Superalloy

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Abstract

To evaluate the potential benefits of utilizing the downward directional solidification process (DWDS) for controlling the homogeneity of microstructures, single-crystal CMSX-4 superalloy bars having different sizes of cross sections have been directionally solidified at a withdrawal rate of 1 mm/min using the DWDS and Bridgman processes. By varying the sizes of the cross sections, the DWDS process demonstrated higher thermal gradients, with smaller microstructural variations. The higher and more uniform thermal gradients not only refined the microstructures but also improved the microstructural homogeneity. In contrast to this, the Bridgman cast bars exhibited large-sized pores and a high volume of microporosity regardless of the cross-sectional size.

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Acknowledgments

This work was supported by the Deutsche Forschungsgemeinschaft under Grant No. MA 2505/3-1. The authors would like to acknowledge the aid of Elke Schaberger-Zimmermann, Elke Breuer, and Maria Schaarschmidt.

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Authors and Affiliations

  1. Foundry Institute, RWTH Aachen University, 52072, Aachen, Germany

    Fu Wang, Dexin Ma (Senior Scientist), Yiran Mao (M.Sc. Student), Samuel Bogner (Ph.D. Student) & Andreas Bührig-Polaczek (Professor)

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  1. Fu Wang
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  2. Dexin Ma
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  3. Yiran Mao
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  4. Samuel Bogner
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  5. Andreas Bührig-Polaczek
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Correspondence to Fu Wang.

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Manuscript submitted May 30, 2015.

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Wang, F., Ma, D., Mao, Y. et al. Influence of the Size Effect on the Microstructures of the DWDS- and Bridgman-Solidified Single-Crystal CMSX-4 Superalloy. Metall Mater Trans B 47, 76–84 (2016). https://doi.org/10.1007/s11663-015-0461-4

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  • DOI: https://doi.org/10.1007/s11663-015-0461-4

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