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Investigation of grain competitive growth during directional solidification of single-crystal nickel-based superalloys

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Abstract

Grain competitive growth of nickel-based single-crystal superalloys during directional solidification was investigated. A detailed characterization of bi-crystals’ competitive growth was performed to explore the competitive grain evolution. It was found that high withdrawal rate improved the efficiency of grain competitive growth. The overgrowth rate was increased when the misorientation increased. Four patterns of grain competitive growth with differently oriented dispositions were characterized. The results indicated that the positive branching of the dendrites played a significant role in the competitive growth process. The effect of crystal orientation and heat flow on the competitive growth can be attributed to the blocking mechanism between the adjacent grains.

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Acknowledgments

This work was jointly supported by the National Natural Science Foundation of China (51101120, 51331005), the Fund of the State Key Laboratory of Solidification Processing in NWPU (SKLSP201411) and Science Foundation of China Huagneng Group, Huaneng Power International Inc.

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Authors and Affiliations

  1. Xi’an Thermal Power Research Institute Co. Ltd., National Energy R&D Center of Clean and High-Efficiency Fossil-Fired Power Generation Technology, Xi’an, 710032, China

    Xinbao Zhao

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

    Xinbao Zhao, Lin Liu & Jun Zhang

Authors
  1. Xinbao Zhao
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  2. Lin Liu
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  3. Jun Zhang
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Correspondence to Xinbao Zhao.

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Zhao, X., Liu, L. & Zhang, J. Investigation of grain competitive growth during directional solidification of single-crystal nickel-based superalloys. Appl. Phys. A 120, 793–800 (2015). https://doi.org/10.1007/s00339-015-9290-1

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  • DOI: https://doi.org/10.1007/s00339-015-9290-1

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