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HIGH‐TEMPERATURE LOW‐CYCLE FATIGUE AND CREEP BEHAVIOUR OF NICKEL‐BASED SUPERALLOYS WITH HEAT‐RESISTANT COATINGS
Author(s) -
Okrajni J,
Cie M,
Swad L
Publication year - 1998
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 - 10.1046/j.1460-2695.1998.00090.x
Subject(s) - creep , superalloy , materials science , isothermal process , metallurgy , coating , nickel , low cycle fatigue , composite material , microstructure , thermodynamics , physics
The problems associated with nickel‐based superalloys with heat‐resisting coatings, as used in aerospace, have been addressed in this paper. The influence of the heat‐resisting coating technology on both the fatigue and creep behaviour of the alloys has been shown. Low‐cycle fatigue and creep tests have been performed. Lifetime conditions have been determined in relation to low‐cycle fatigue, isothermal creep and creep at cyclically variable temperatures, as a function of the chemical composition of the coating, parameters of the thermal treatment and thickness of the coating. Possible processes and mechanisms of fracture are discussed.