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Formation of Lateral Sliver Defects in the Platform Region of Single-Crystal Superalloy Turbine Blades

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Abstract

Sliver defects are known to extend along the casting axial direction. In this study, the lateral sliver defects on the platform base of single-crystal (SX) superalloy turbine blades were detected by macrocorrosion and electron backscattering diffraction. It was identified that misorientation between adjacent sliver textures was limited within medium-angle misorientation defects (10.5 deg). Moreover, the lateral sliver defects were more prone to occurring at a lower withdrawal rate. Based on the evolution of thermal profile and stress contours, the high stresses around the boundary between the blade body and the platform region were supposed to be the formation mechanism of lateral sliver defects.

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This work was supported by the National Natural Science Foundation of China (51331005, 51631008, 51690163, 51771148, and 51501152), The National Key Research and Development Program (2016YFB0701400 and 2017YFB0702900), the Natural Science Foundation of Shaanxi Province (2016JQ5093), and the Fundamental Research Funds for the Central Universities (3102017ZY054).

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Authors and Affiliations

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

    Dejian Sun, Lin Liu, Taiwen Huang, Wenchao Yang, Chuang He, Zhuoran Li, Jun Zhang & Hengzhi Fu

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  1. Dejian Sun
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  2. Lin Liu
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  3. Taiwen Huang
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Correspondence to Lin Liu or Taiwen Huang.

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Manuscript submitted September 16, 2018.

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Sun, D., Liu, L., Huang, T. et al. Formation of Lateral Sliver Defects in the Platform Region of Single-Crystal Superalloy Turbine Blades. Metall Mater Trans A 50, 1119–1124 (2019). https://doi.org/10.1007/s11661-018-5060-y

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