Hydrogen-assisted fatigue crack growth in ferritic steels – a fractographic study

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2018
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Abstract
Fatigue crack growth (FCG) behavior of a Fe-3wt.%Si ferritic alloy under different environmental conditions using in-situ electrochemical (cathodic) hydrogen (H) charging has been investigated. Three frequencies have been applied. Results clearly show that the FCG rate increased by a factor spanning from 20 to 1000 times, depending on the loading frequencies, when compared to the reference test in air. Lower frequency leads to higher FCG rate. A comprehensive fractographic analysis was carried out: the area fraction of different fracture surface features was measured and taken into statistical analysis. Based on these investigations, the possible mechanisms of H-enhanced FCG are discussed. Similar tests in high-pressure H gas from other studies were also compared and discussed. These results give a preliminary understanding of H effect in fatigue crack propagation procedure in ferritic alloys.
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Authors Di, Wan;Antonio, Alvaro;Vigdis, Olden;Afrooz, Barnoush;
Journal matec web of conferences
Year 2018
DOI
DOI not found
URL
https://doi.org/10.1051/matecconf/201816503004
Keywords
Engineering (General). Civil engineering (General) Mechanical engineering and machinery motor vehicles. aeronautics. astronautics engineering geology. rock mechanics. soil mechanics. underground construction structural engineering (general)

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