Threshold stress intensity factor for delayed hydride cracking in Zr-2.5%Nb pressure tube alloy

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Threshold stress intensity factor for delayed hydride cracking in Zr-2.5%Nb pressure tube alloy

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Publication Article, peer reviewed scientific
Title Threshold stress intensity factor for delayed hydride cracking in Zr-2.5%Nb pressure tube alloy
Author(s) Singh, Ram N ; Ståhle, Per ; Chakravartty, JK ; Shmakov, AA
Date 2009
English abstract
Delayed hydride cracking (DHC) velocity was determined at 203, 227, 250 and 283 °C using 17 mm width curved compact toughness specimens machined from an unirradiated Zr–2.5 wt.% Nb pressure tube spool, gaseously charged with 60 ppm of hydrogen by weight. Single CT specimen was used to determine DHC velocity at a constant temperature for a range of stress intensity factor (KI) obtained by load drop method. For a given temperature and KI > 15 MPa m1/2, DHC velocity was found to be practically independent of KI. For 15 > KI > 10 MPa m1/2, DHC velocity decreased significantly with decrease in stress intensity factor and extrapolation of the data suggested the threshold stress intensity factor to be about 9–11 MPa m1/2 in the aforementioned temperature range. The activation energy associated with DHC was observed to be 35.1 kJ/mol.
DOI http://dx.doi.org/10.1016/j.msea.2009.05.066 (link to publisher's fulltext)
Host/Issue Materials Science and Engineering: A;1-2
Volume 523
ISSN 0921-5093
Pages 112-117
Language eng (iso)
Subject(s) Technology
Research Subject Categories::TECHNOLOGY::Materials science
Handle http://hdl.handle.net/2043/9481 (link to this page)

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