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The role of intergranular chromium carbides on intergranular oxidation of nickel based alloys in pressurized water reactors primary water
Abstract : Alloy 600 is used in pressurized water reactors (PWRs) but is susceptible to primary water stress corrosion cracking (PWSCC). Intergranular chromium carbides have been found beneficial to reduce PWSCC. Focussed ion beam coupled with scanning electron microscopy (FIB/SEM) 3D tomography has been used to reconstruct the morphology of grain boundary oxide penetrations and their interaction with intergranular Cr carbides in Alloy 600 subjected to a PWR environment. In presence of intergranular Cr carbides, the intergranular oxide penetrations are less deep but larger than without carbide. However, the intergranular oxide volumes normalized by the grain boundary length for both samples are similar, which suggest that intergranular oxidation growth rate is not affected by carbides. Analytical transmission electron microscopy (TEM) shows that the intergranular oxide consists mainly in a spinel-type oxide containing nickel and chromium, except in the vicinity of Cr carbides where Cr 2 O 3 was evidenced. The formation of chromium oxide may explain the lower intergranular oxide depth observed in grain boundaries containing Cr carbides.
Littérature citée [23 références]
https://hal-mines-paristech.archives-ouvertes.fr/hal-01292423
Contributeur : Bibliothèque Umr7633 <>
Soumis le : mercredi 23 mars 2016 - 10:07:41
Dernière modification le : mardi 28 avril 2020 - 11:28:11
Document(s) archivé(s) le : lundi 14 novembre 2016 - 02:31:46
Contributeur : Bibliothèque Umr7633 <>
Soumis le : mercredi 23 mars 2016 - 10:07:41
Dernière modification le : mardi 28 avril 2020 - 11:28:11
Document(s) archivé(s) le : lundi 14 novembre 2016 - 02:31:46
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