Oxidation and SCC initiation studies of Type 304L SS in PWR primary water

Fabio Scenini, John Lindsay, Litao Chang, Yong Liang Wang, M. Grace Burke, S. Lozano-Perez, G. Pimentel, D. Tice, K. Mottershead, V. Addepalli

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    Abstract

    Slow strain rate tensile (SSRT) tests were conducted on conventional and tapered samples manufactured from forged Type 304L stainless steel to assess the stress corrosion cracking (SCC) behaviour in simulated PWR primary water. Several testing and microstructural parameters were investigated in order to explore the conditions under which crack initiation might occur. Surface preparation appeared to play a very important role on SCC initiation whereby the machined surfaces were the least susceptible to SCC initiation whilst oxide polishing suspension (OPS) polished surfaces were more susceptible. On the machined surfaces the cracks were always transgranular (TG) in nature and associated with the machining marks. Conversely, on fine polished surfaces with oxide polishing suspension the crack morphology was mainly intergranular in nature, although minor transgranular cracking was observed. The regions in the proximity of the -ferrite/austenite interface were shown to be very susceptible to SCC initiation especially on the OPS polished surfaces and this was attributed to the strain localization upon dynamic deformation. Furthermore, intragranular inclusions appeared to dissolve and act as initiation sites for transgranular cracking to occur. The roles of strain rate, dynamic deformation and microstructure on the initiation of SCC are also discussed.
    Original languageEnglish
    Title of host publicationProceedings of the 18th International Conference on Environmental Degradation in Nuclear Power Systems - Water Reactors
    Pages793-810
    Number of pages18
    DOIs
    Publication statusPublished - 2018

    Keywords

    • oxidation
    • stress corrosion cracking (SCC) initiation
    • slow strain rate test (SSRT)
    • 304L stainless steel

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