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CRACK NUCLEATION AND PROPAGATION IN BLADE STEEL MATERIAL
Author(s) -
Gabetta G.,
Torri L.
Publication year - 1992
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.1460-2695.1992.tb00036.x
Subject(s) - materials science , nucleation , corrosion fatigue , fracture mechanics , crack closure , corrosion , metallurgy , cracking , stress corrosion cracking , stress intensity factor , composite material , bending , fracture (geology) , stress (linguistics) , stress concentration , chemistry , linguistics , philosophy , organic chemistry
Stress corrosion cracking and corrosion fatigue of 12 Cr steel in sodium chloride solution has been investigated. Tests have been performed in air at room temperature and in aqueous solution with 22% NaCl at 80°C. The influence of corrosion pits on crack nucleation has been investigated. On fracture surfaces tested in environment (22% NaCl solution), crack initiation was observed in correspondence with corrosion pits; in this case fatigue life can be described using a fracture mechanics approach. The Δ K value for crack nucleation from a pit in rotating bending fatigue tests is very low in air (about 3 MPa√m). The results of slow strain rate tests on smooth specimens show that there is a threshold stress intensity, K ISCC , of about 15 MPa√m and a plateau in stress corrosion crack growth rate of about 10 ‐5 mm/s.