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A STUDY OF FATIGUE FRACTURE SURFACES OF A CAST NICKEL‐BASE SUPERALLOY
Author(s) -
Weicheng Yu,
Jincai Yuan,
Zhongguang Wang
Publication year - 1987
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/j.1460-2695.1987.tb00469.x
Subject(s) - materials science , superalloy , cleavage (geology) , paris' law , metallurgy , facet (psychology) , fracture (geology) , crack closure , alloy , fracture mechanics , composite material , nickel , psychology , social psychology , personality , big five personality traits
Morphological features of fatigue fracture surfaces of a cast nickel‐base super‐alloy were investigated over the range of crack growth rates, 10 ‐10 ‐10 ‐6 m/cycle. The cleavage facet growth in stage I and the transition of crack propagation from state I to stage II were studied by a combined study of surface crack growth rate and fracture surface examinations. A correlation between fatigue crack growth and the fracture surface appearance plus microstructural aspects has been established. It is suggested that fatigue‐induced vacancies might play a significant part in cleavage facet growth at lower crack growth rates.