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Failure assessment of the first stage high‐pressure turbine blades in an aero‐engine turbine
Author(s) -
Shi D.,
Wang C.,
Yang X.,
Li S.
Publication year - 2017
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.12630
Subject(s) - turbine blade , reliability (semiconductor) , turbine , fatigue testing , structural engineering , creep , service (business) , aero engine , fracture (geology) , cyclic stress , stress (linguistics) , materials science , phase (matter) , engineering , mechanical engineering , composite material , physics , economy , philosophy , organic chemistry , quantum mechanics , chemistry , economics , power (physics) , linguistics
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.