Effect of hydrogenated low temperature water on fracture toughness of nickel based weld metals

Matias Ahonen, Ulla Ehrnsten, Hannu Hänninen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    Abstract

    Nickel-based alloys are susceptible to a form of hydrogen embrittlement, Low Temperature Crack Propagation (LTCP), which can cause severe degradation of the fracture resistance of nickel-based alloys. LTCP may occur in low temperature water, with the highest susceptibility reported at about 55 C, with high stress and slow loading rate in pre-cracked Ni-based materials. Although LTCP has not been reported in commercial reactors, the susceptibility of different alloys is important to establish. As a part of the Finnish Reactor Safety Program, SAFIR 2010, the effect of hydrogenated Pressurized Water Reactor, PWR, primary water on the LTCP susceptibility of nickel-based weld metals of Alloy 182, 82, 152 and 52 was studied performing J-R-tests at a slow displacement rate in simulated low temperature PWR primary water. The results revealed that Alloy 182 is the most susceptible nickel-based weld metal to LTCP. Pure weld metal specimens were substantially more susceptible to LTCP than the dissimilar metal weld specimens. Pre-exposure to high temperature hydrogenated water did not affect remarkably the fracture toughness of any of the test materials.
    Original languageEnglish
    Title of host publicationBaltica VIII
    Subtitle of host publicationLife Management and Maintenance for Power Plants
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Pages372-383
    Volume1
    ISBN (Electronic)978-951-38-7592-3
    ISBN (Print)978-951-38-7591-6
    Publication statusPublished - 2010
    MoE publication typeB3 Non-refereed article in conference proceedings
    EventBALTICA VIII - International Conference on Life Management and Maintenance for Power Plants - Helsinki-Stockholm, Finland
    Duration: 18 May 201020 May 2010

    Publication series

    SeriesVTT Symposium
    Number264
    ISSN0357-9387

    Conference

    ConferenceBALTICA VIII - International Conference on Life Management and Maintenance for Power Plants
    CountryFinland
    CityHelsinki-Stockholm
    Period18/05/1020/05/10

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    Ahonen, M., Ehrnsten, U., & Hänninen, H. (2010). Effect of hydrogenated low temperature water on fracture toughness of nickel based weld metals. In Baltica VIII: Life Management and Maintenance for Power Plants (Vol. 1, pp. 372-383). VTT Technical Research Centre of Finland. VTT Symposium, No. 264 http://www.vtt.fi/inf/pdf/symposiums/2011/S264.pdf