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dc.contributor.authorBirenis, Domas
dc.contributor.authorOgawa, Yuhei
dc.contributor.authorMatsunaga, Hisao
dc.contributor.authorTakakuwa, Osamu
dc.contributor.authorYamabe, Junichiro
dc.contributor.authorPrytz, Øystein
dc.contributor.authorThøgersen, Annett
dc.date.accessioned2020-12-30T11:07:17Z
dc.date.available2020-12-30T11:07:17Z
dc.date.created2018-07-10T13:55:26Z
dc.date.issued2018
dc.identifier.issn2261-236X
dc.identifier.urihttps://hdl.handle.net/11250/2721116
dc.description.abstractHydrogen effect on fatigue performance at relatively high values of stress intensity factor range, ΔK, of pure BCC iron has been studied with a combination of various electron microscopy techniques. Hydrogen-assisted fatigue crack growth rate is manifested by a change of fracture features at the fracture surface from ductile transgranular in air to quasi-cleavage in hydrogen gas. Grain reference orientation deviation (GROD) analysis has shown a dramatic suppression of plastic deformation around the crack wake in samples fatigued in hydrogen. These results were verified by preparing site-specific specimens from different fracture features by using Focused Ion Beam (FIB) technique and observing them with Transmission Electron Microscope (TEM). The FIB lamella taken from the sample fatigued in air was decorated with dislocation cell structure indicating high amount of plasticity, while the lamella taken from the quasi-cleavage surface of the sample fatigued in hydrogen revealed a distribution of dislocation tangles which corresponds to smaller plastic strain amplitude involved at the point of fracture. These results show that a combination of critical hydrogen concentration and critical stress during fatigue crack growth at high ΔK values triggers cleavage-like fracture due to reduction of cohesive force between matrix atoms.en_US
dc.language.isoengen_US
dc.publisherEDP Sciencesen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleHydrogen-assisted fatigue crack propagation in a pure BCC iron. Part II: Accelerated regime manifested by quasi-cleavage fracture at relatively high stress intensity range valuesen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.rights.holder© The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).en_US
dc.source.pagenumber6en_US
dc.source.volume165en_US
dc.source.journalMATEC Web of Conferencesen_US
dc.identifier.doi10.1051/matecconf/201816503010
dc.identifier.cristin1596561
dc.relation.projectNORTEM: 197405en_US
dc.source.articlenumber03010en_US
cristin.unitcode7401,80,0,0
cristin.unitnameSINTEF Industri
cristin.ispublishedtrue
cristin.fulltextpreprint
cristin.qualitycode1


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