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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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Abstract:

The low cycle fatigue tests of SA508 Gr.1a low alloy steel in 310oC 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.

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Periodical:

Advanced Materials Research (Volumes 26-28)

Pages:

1121-1124

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.26-28.1121

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Online since:

October 2007

Authors:

Hyun Chul Cho, Hun Jang, Byoung Koo Kim, In Sup Kim, Chang Heui Jang

Keywords:

Fatigue Life, Hydrogen-Induced Cracking (HIC), Low Alloy Steel, Slip-Dissolution/Oxidation, Strain Rate

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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