Investigations on the mechanisms of PWSCC of strain hardened austenitic stainless steels

T. Couvant, L. Legras, C. Pokor, F. Vaillant, Y. Brechet, J. M. Boursier, P. Moulart

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

42 Citations (Scopus)

Abstract

Limited cases of stress corrosion cracking (SCC) have been recently observed in French PWRs (heaters of pressurizers), in high strain hardened non-sensitized austenitic stainless steels exposed to primary environment. Consequently, a R&D program has been conducted, in addition to hot laboratories investigations, in order to understand the mechanisms responsible for PWSCC at 360°C. Stress corrosion tests were performed on AISI 304L and 316L, in hydrogenated primary environments (7.2 < pH320°C < 9.2) at 360°C. Particular attention was directed towards the correlation between selective oxidation and strain localization due to microtwining and strain incompatibilities. Based on electron microscope examinations (SEM and TEM), a description of the possible contribution of the strain localization in the mechanism of PWSCC is proposed. Experimental results are finally compared to hot laboratory observations of pressurizer heaters.

Original languageEnglish
Title of host publicationCanadian Nuclear Society - 13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems 2007
Pages499-514
Number of pages16
Publication statusPublished - 2007
Externally publishedYes
EventInternational Conference on Environmental Degradation of Materials in Nuclear Power Systems 2007 - Whistler, Canada
Duration: 19 Apr 200723 Apr 2007
Conference number: 13th

Publication series

NameCanadian Nuclear Society - 13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems 2007
Volume1

Conference

ConferenceInternational Conference on Environmental Degradation of Materials in Nuclear Power Systems 2007
CountryCanada
CityWhistler
Period19/04/0723/04/07

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