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

  • Dejian Sun
  • Lin LiuEmail author
  • Taiwen HuangEmail author
  • Wenchao Yang
  • Chuang He
  • Zhuoran Li
  • Jun Zhang
  • Hengzhi Fu
Communication
  • 51 Downloads

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.

Notes

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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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’anChina

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