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Rare Metals

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Evaluation of service-induced microstructural damage for directionally solidified turbine blade of aircraft engine

  • Wei-Qing Huang
  • Xiao-Guang Yang
  • Shao-Lin Li
Article
  • 36 Downloads

Abstract

Turbine blades of gas turbine engines usually suffer from severe operational conditions characterized by high temperature and stress. Severe operational conditions during service cause microstructural changes in turbine blades and degrade their mechanical properties. In this study, service-induced microstructural damages in serviced turbine blades manufactured from a directionally solidified superalloy were evaluated. The observed microstructural damage of the turbine blade mainly involves the coarsening and rafting of γ′ precipitates. The leading edge of 60% height of the turbine blades undergone most severe microstructural damage with significant microstructural evolution at this area. Microstructural damage affects the mechanical properties such as Vickers hardness, that is, Vickers hardness decreases as the equivalent diameter decreases. Microstructural damage shows great position-dependent feature as service temperature and radial stress on blade changes. With the aid of energy-dispersive spectrometer (EDS) analysis on carbide, the transformation of carbide does not exist. In addition, no topological closed-packed phase exists in the turbine blade.

Keywords

Service-induced Microstructural damage Directionally solidified Turbine blade Aircraft engine 

Notes

Acknowledgements

This study was financially supported by the National Basic Research Program of China (No. 2015CB057401).

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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Energy and Power EngineeringBeihang UniversityBeijingChina
  2. 2.Beijing Key Laboratory of Aero-Engine Structure and StrengthBeijingChina

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