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Title
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TEM investigation of SCC crack tips in high Si stainless steel tapered specimens
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Author
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Abstract
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| The stress corrosion cracking (SCC) mechanism is investigated in high Si duplex stainless steel in a simulated PWR environment based on TEM analysis of FIB-extracted SCC crack tips. The microstructural investigation in the near vicinity of SCC crack tips illustrates a strain-rate dependence in SCC mechanisms. Detailed analysis of the crack tip morphology, that includes crack tip oxidation and surrounding deformation field, indicates the existence of an interplay between corrosion- and deformation-driven failure as a function of the strain rate. Slow strain-rate crack tips exhibit a narrow cleavage failure which can be linked to the film-induced failure mechanism, while rounded shaped crack tips for faster strain rates could be related to the strain-induced failure. As a result, two nominal strain-rate-dependent failure regimes dominated either by corrosion or deformation-driven cracking mechanisms can be distinguished. |
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Language
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English
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Source (journal)
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Corrosion engineering science and technology. - Place of publication unknown
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Publication
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Abingdon
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Taylor & francis ltd
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2021
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ISSN
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1478-422X
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DOI
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10.1080/1478422X.2021.1961665
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Volume/pages
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56
:8
(2021)
, p. 767-777
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ISI
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000695956400001
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Full text (Publisher's DOI)
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Full text (open access)
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