Journal
ACTA MATERIALIA
Volume 59, Issue 4, Pages 1601-1606Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2010.11.024
Keywords
Scanning electron microscopy; Transmission electron microscopy; Steels; Hydrogen embrittlement; Fracture
Funding
- DOE [GO15045]
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Quasi-cleavage, a common feature of hydrogen-induced fracture surfaces, is generally taken as being cleavage-like but not along a known cleavage plane. Despite the frequency with which this surface is observed, the relationship to the underlying microstructure remains unknown. Through a combination of topographical reconstruction of secondary electron microscope fractographs and a transmission electron microscopy study of the microstructure from site-specific locations, it will be shown that the features on quasi-cleavage surfaces are ridges that can be correlated with sub-surface intense and highly localized deformation bands. It will be demonstrated that the fracture surface arises from the growth and coalescence of voids that initiate at and extend along slip band intersections. This mechanism and process is fully consistent with hydrogen enhancing and localizing plastic processes. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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