Plastic strain and residual stress distributions in an AISI 304 stainless steel BWR pipe weld

Tapio Saukkonen, Miikka Aalto, Iikka Virkkunen, Ulla Ehrnstén, Hannu Hänninen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    5 Citations (Scopus)

    Abstract

    In AISI 304 stainless steel pipe welds weld shrinkage causes large variations in residual plastic strain in different parts of the weld metal and heat-affected zone (HAZ). The amount of strain was analyzed by EBSD quantitatively by comparing the intra-grain misorientations to the calibration curve. Highest degrees of plastic strain (10.20%) were detected in the HAZ close to the root area of a prototypical BWR plant weld. Strain in the weld metal varies in the different directions of solidification, being high in the weld bead boundaries and near the fusion lines. Preliminary studies of the effects of mechanical and elastic anisotropy of the weld metal microstructure on the grain size level were performed by EBSD and nanoindentation. The residual stress distribution in the same weld cross-section was determined by a contour method. The residual strain and stress distributions are superimposed and EAC susceptibility of various areas of the pipe weld is evaluated and discussed.
    Original languageEnglish
    Title of host publicationProceedings of the 15th international Conference on Environmental Degradation of Materials in Nuclear power Systems - Water reactors
    EditorsGabriell Ilevbare, Jeremy Busby, Peter Andersen
    Pages2351-2367
    ISBN (Electronic)978-3-319-48760-1
    Publication statusPublished - 2011
    MoE publication typeA4 Article in a conference publication
    Event15th international Conference on Environmental Degradation of Materials in Nuclear power Systems - Water reactors - Colorado Springs, CO, United States
    Duration: 7 Aug 201111 Aug 2011

    Conference

    Conference15th international Conference on Environmental Degradation of Materials in Nuclear power Systems - Water reactors
    CountryUnited States
    CityColorado Springs, CO
    Period7/08/1111/08/11

    Keywords

    • Electron backsacatter diffraction
    • stainless steel piping
    • welding
    • boiling water reactor
    • stress corrosion cracking
    • residual stress and strain
    • mechanical anisotropy

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