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Influence of oxide films on primary water stress corrosion cracking initiation of alloy 600

Panter, J. and Viguier, Bernard and Cloué, Jean-Marc and Foucault, M. and Combrade, P. and Andrieu, Eric Influence of oxide films on primary water stress corrosion cracking initiation of alloy 600. (2006) Journal of Nuclear Materials, 3 (1-2). 213-221. ISSN 0022-3115

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Official URL: http://dx.doi.org/10.1016/j.jnucmat.2005.10.002


In the present study alloy 600 was tested in simulated pressurised water reactor (PWR) primary water, at 360 °C, under an hydrogen partial pressure of 30 kPa. These testing conditions correspond to the maximum sensitivity of alloy 600 to crack initiation. The resulting oxidised structures (corrosion scale and underlying metal) were characterised. A chromium rich oxide layer was revealed, the underlying metal being chromium depleted. In addition, analysis of the chemical composition of the metal close to the oxide scale had allowed to detect oxygen under the oxide scale and particularly in a triple grain boundary. Implication of such a finding on the crack initiation of alloy 600 is discussed. Significant diminution of the crack initiation time was observed for sample oxidised before stress corrosion tests. In view of these results, a mechanism for stress corrosion crack initiation of alloy 600 in PWR primary water was proposed.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TXN-4HPK93M-1&_user=4373306&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_version=1&_urlVersion=0&_userid=4373306&md5=e2c88876df8a8a86d273fe7b58f30345 The journal of Nuclear Materials Website : http://www.elsevier.com/wps/find/journaldescription.cws_home/505671/description#description
Audience (journal):International peer-reviewed journal
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Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Framatome, Centre Technique (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
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Deposited On:05 Sep 2008 12:20

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