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- Title
Failure assessment of the first stage high-pressure turbine blades in an aero-engine turbine.
- Authors
Shi, D.; Wang, C.; Yang, X.; Li, S.
- Abstract
In this paper, microscopic analysis and fatigue experiment were conducted to detect the damage degree of turbine blades after a 600 h service and determine the reliable service time. First, several service blades were cut into slices on different cross sections and microscopically examined. It is found that the γ′ phase particles are slightly coarsened and the γ′ phase parameters change with temperature and stress distribution. Then, fatigue test was conducted on service blades simulating the real working condition. The test result shows that the blades after a 600 h service would serve for 3596 h more until failure during actual flight. The ultimate fracture is mainly caused by the interaction of fatigue, creep and oxidation. Besides, the γ′ phase parameters change obviously compared with service blade without fatigue test. It indicates that the γ′ phase parameters could be used to evaluate the microdamage of service blades, which has great significance for service reliability of the turbine machinery.
- Subjects
FATIGUE testing machines; TURBINE blades; STRESS concentration; FRACTURE mechanics; BLADES (Hydraulic machinery)
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2017, Vol 40, Issue 12, p2092
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.12630