Effect of cyclic strain rate on environmental fatigue behaviors of SA508 Gr.1a low alloy steel in 310°C deoxygenated water

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The low cycle fatigue tests of SA508 Gr.1a low alloy steel in 310°C deoxygenated water were conducted to investigate the effect of cyclic strain rate on the environmentally assisted cracking (EAC) mechanisms. The flattened striations and the blunt crack tip, which indicate the occurrence of the slip dissolution/oxidation, were mainly observed for the specimen tested at 0.008 %/s. On the other hand, the brittle cracks and the blunt main crack with microcracks, which are the evidences of the hydrogen-induced cracking (HIC), were observed for the specimens tested at 0.04 and 0.4 %/s. Through this study, it is thought that the slip dissolution/oxidation dominantly contributes to the reduction in the fatigue life at a strain rate of 0.008 %/s and the HIC is mainly responsible for the reduction in the fatigue life at strain rates of 0.04 and 0.4 %/s.
Publisher
Trans Tech Publications
Issue Date
2007
Language
English
Citation

ADVANCED MATERIALS RESEARCH, v.24-25, no.0, pp.1121 - 1124

ISSN
1022-6680
URI
http://hdl.handle.net/10203/89894
Appears in Collection
NE-Journal Papers(저널논문)
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