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Evolution of Sliver Defect in Ni-Based Single Crystal Superalloy

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Abstract

The evolution of sliver defect in a Ni-based single crystal superalloy was explored by casting samples with a similar geometry of the airfoil section of a turbine blade using optical microscope and electron backscattered diffraction. It was found that the sliver generally initiated from 1 to 2 tertiary dendrites at the diverging boundary between the mold wall and matrix. All slivers were tilt from matrix along the [001] and some of them rotated relative to the matrix on the plane perpendicular to the solidification direction. During solidification sliver in most castings grew with a fixed orientation. All slivers can extend along the solidification direction to the top of the casting. Most of the sliver defects showed constant width and did not extend on the casting surface. However, the sliver with large misorientation to matrix on the cross section perpendicular to the solidification direction extended on the casting surface and into the casting quickly.

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Acknowledgments

This work was financially supported by the National Key Research and Development Program of China (Grant No. 2016YFB0701403), National Natural Science Foundation of China (Grant Nos. 51631008, 91860201, 51771204 and U1732131), National Science and Technology Major Project (Grant Nos. 2017-VII-0008-0101 and 2017-VI-0003-0073) and Key Deployment Projects of the Chinese Academy of Sciences (Grant No. ZDRW-CN-2019-01). The authors are grateful for those supports.

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Authors and Affiliations

  1. Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, P.R. China

    Yaqi Huang, Jian Shen, Dong Wang, Guang Xie, Yuzhang Lu, Langhong Lou & Jian Zhang

  2. School of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, P.R. China

    Yaqi Huang

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  1. Yaqi Huang
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  2. Jian Shen
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  3. Dong Wang
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  5. Yuzhang Lu
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Correspondence to Jian Zhang.

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Manuscript submitted January 19, 2020.

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Huang, Y., Shen, J., Wang, D. et al. Evolution of Sliver Defect in Ni-Based Single Crystal Superalloy. Metall Mater Trans A 51, 6364–6372 (2020). https://doi.org/10.1007/s11661-020-06003-9

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  • DOI: https://doi.org/10.1007/s11661-020-06003-9

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