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Cavitation Damage of the single‐crystal nickel‐base superalloy SRR99 during creep at 850°C
Author(s) -
Hashem A. M.,
Goldschmidt D.,
ElMagd E.
Publication year - 1994
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19940250310
Subject(s) - creep , materials science , superalloy , cavitation , fracture (geology) , composite material , perpendicular , cracking , stress (linguistics) , phase (matter) , metallurgy , crystal (programming language) , nickel , microstructure , geometry , mechanics , chemistry , computer science , programming language , linguistics , physics , mathematics , philosophy , organic chemistry
Various heat treatments of the single‐crystal nickel‐base superalloy SRR99 have been carried out to produce a wide range of initial γ′ phase morphology. The cavitation damage has been studied after creep fracture at 850°C and stresses between 400MPa and 650 Mpa. The crep fracture surfaces and longitudinal sections of crept specimens have been examined by image analysing system in order to determine the size distribution and the area fraction of (001)‐planes cracks on fracture surface characterise the creep crack damage level. The cracking morphology in fractured material as a function of stress and γ′‐phase size has also been investigated. The results show, that crack propagation occurred anisotropically on (001) crystallographic planes perpendicular to the aplied stress along the γ/γ′ interfaces. It was found, that creep cracks dependent on the shape and size of γ′‐phases developing at the temperature and stress level.