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Threshold stress intensity factor for delayed hydride cracking in Zr-2.5%Nb pressure tube alloy
Malmö högskola, School of Technology (TS).
2009 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 523, no 1-2, p. 112-117Article in journal (Refereed)
Abstract [en]

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.

Place, publisher, year, edition, pages
2009. Vol. 523, no 1-2, p. 112-117
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:mau:diva-2462DOI: 10.1016/j.msea.2009.05.066Scopus ID: 2-s2.0-68949192832Local ID: 9481OAI: oai:DiVA.org:mau-2462DiVA, id: diva2:1399215
Available from: 2020-02-27 Created: 2020-02-27 Last updated: 2024-02-06Bibliographically approved

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Ståhle, Per

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