Hydrogen-assisted fatigue crack growth in ferritic steels – a fractographic study
Journal article, Peer reviewed
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OriginalversjonMATEC Web of Conferences. 2018, 165 (03004), . https://doi.org/10.1051/matecconf/201816503004
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 thatthe FCG rate increased by a factor spanning from 20 to 1000 times, depending on the loadingfrequencies, when compared to the reference test in air. Lower frequency leads to higher FCG rate. A comprehensive fractographic analysis was carried out: the areafraction 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.