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OVERLOAD EFFECTS IN ENVIRONMENTAL HYDROGEN INDUCED FRACTURE
Author(s) -
Gao H.,
Yang X.,
Cao W.,
De Los Rios E. R.
Publication year - 1996
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.1460-2695.1996.tb00999.x
Subject(s) - materials science , hydrogen , dislocation , fracture (geology) , plasticity , residual stress , metallurgy , stress (linguistics) , composite material , service life , fracture mechanics , structural engineering , forensic engineering , chemistry , engineering , linguistics , philosophy , organic chemistry
— A study has been made of the effect of short periods of overloading on the environmental hydrogen induced fracture (HIF) life of 0.42% C, 0.87% Cr, 0.2% Mo steel tested in a 0.5 mol/L H 2 SO 4 solution under continuously hydrogen charging conditions. Experimental results showed that when the overloading was applied during the early or middle stage of the test, the HIF life was longer than that obtained at constant stress; however, if the overloading was applied during the later stages, a shortened HIF life was obtained. It is important to note that the processes of HIF (including hydrogen absorption, transportation and accumulation, crack initiation and propagation) depend not only on the electrochemical condition, but also on both stress‐strain state and stress history. In view of the above considerations, effects of plasticity induced closure, residual compression stress, dislocation shielding and overload damage, which control HIF life, are discussed.