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Mode and mechanism of fatigue fracture of a pearlitic steel in hydrogenIt is presently suggested that there are two mechanisms that cause fatigue crack initiation in a specimen subjected to a hydrogen environment: either a critical concentration of hydrogen is attained within the specimen, causing Mode I crack initiation, or the presence of some hydrogen (below critical concentration) promotes the early onset of plastic instability at the sites of maximum strain. It is further suggested that in the static loading condition, a high hydrogen concentration may be attained by way of mechanical factors, causing Mode I crack initiation. While cyclic fatigue specimens exhibited Mode II crack initiation in air, only Mode I crack initiation emerged in a hydrogen environment.
Document ID
19860037742
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lo, S. H.
(Ontario Research Foundation Mississauga, Canada)
Johnson, H. H.
(Cornell University Ithaca, NY, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1986
Publication Information
Publication: Scripta Metallurgica
Volume: 20
ISSN: 0036-9748
Subject Category
Metallic Materials
Accession Number
86A22480
Distribution Limits
Public
Copyright
Other

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