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Formation of Sliver Defect in Ni-Based Single Crystal Superalloy

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Abstract

The formation mechanism of sliver defect in Ni-based single crystal superalloy was investigated by X-ray computed tomography and electron backscattered diffraction. The origin of sliver due to the localized deformation of 1-2 dendrites near the mold wall was experimentally observed. The diverging boundary was the favorite position for sliver initiation. It was found that the deformation that induced sliver occurred in the mushy zone and was limited in the lower part of the dendrite. Thermal contraction forces played an important role in the formation of sliver. The dendrite deformation was attributed to the imbalanced force loaded on the dendrite.

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This work was financially supported by the National Natural Science Foundation of China (Grant Nos: 51631008, 91860201, 51771204, and U1732131) and National Science and Technology Major Project (Grand No. 2017-VII-0008-0101). 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, 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, China

    Yaqi Huang

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  1. Yaqi Huang
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Correspondence to Jian Zhang.

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Manuscript submitted July 22, 2019.

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Huang, Y., Shen, J., Wang, D. et al. Formation of Sliver Defect in Ni-Based Single Crystal Superalloy. Metall Mater Trans A 51, 99–103 (2020). https://doi.org/10.1007/s11661-019-05516-2

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