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Influence of δ phase precipitation on the stress corrosion cracking resistance of alloy 718 in PWR primary water

Deleume, Julien and Cloué, Jean-Marc and Andrieu, Eric Influence of δ phase precipitation on the stress corrosion cracking resistance of alloy 718 in PWR primary water. (2008) Journal of Nuclear Materials, vol. 382 (n° 1). pp. 70-75. ISSN 0022-3115

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Official URL: http://dx.doi.org/10.1016/j.jnucmat.2008.09.018

Abstract

The negative influence of δ phase on the intergranular stress corrosion cracking (IGSCC) resistance of alloy 718 is commonly taken for granted. In addition, δ phase formed at low temperature (about 1023 K) do not present the same characteristics than the one formed at higher temperatures (from 1173 to 1273 K). The aim of the present study is then to understand how δ phase precipitation could enhance crack initiation in alloy 718, whatever the form of δ phase is. For that purpose, several heat treatments leading to δ phase precipitation were realized on two alloy 718 heats, one sensitive to IGSCC and the second not. Specific slow strain rate tensile tests carried out on thin tensile specimens in simulated PWR primary medium at 633 K conclusively prove that δ phase has no effect on the intrinsic sensitivity to intergranular crack initiation of tested heats.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Journal of Nuclear Materials website : http://www.sciencedirect.com/science/journal/00223115
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > AREVA (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By:Celine Cabaup

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