Environmentally assisted cracking crack initiation in nickel-based alloy dissimilar metal welds in doped and pure steam and pressurized water reactor water

Aki Toivonen, Hannu Hänninen, Tapio Saukkonen, Pertti Aaltonen

    Research output: Contribution to journalArticleScientificpeer-review

    2 Citations (Scopus)

    Abstract

    Environmentally assisted cracking (EAC) susceptibilities of Alloys 600, 690, and their weld metals with and without weld defects were benchmarked in pure and doped hydrogenated steam at 400°C and pressurized water reactor (PWR) water at 360°C on four-point bend (0.35% to 1.1% strain) and U-bend specimens (5% strain). Contrary to the expectations, no EAC initiation from existing weld defects was observed. As expected, Alloy 600 and its weld metals were much more prone to EAC initiation than Alloy 690 and its weld metals. Oxide structures remain the same in doped and pure steam and PWR water, although the environment has an impact on the EAC initiation times and oxidation rates. Because of the similar oxide structures, the EAC mechanism is assumed to be the same in all studied environments.
    Original languageEnglish
    Pages (from-to)808-821
    Number of pages14
    JournalCorrosion
    Volume73
    Issue number7
    DOIs
    Publication statusPublished - 1 Jul 2017
    MoE publication typeA1 Journal article-refereed

    Keywords

    • dissimilar metal weld
    • environmentally assisted cracking
    • nickel alloys
    • steam
    • stress corrosion cracking

    Fingerprint Dive into the research topics of 'Environmentally assisted cracking crack initiation in nickel-based alloy dissimilar metal welds in doped and pure steam and pressurized water reactor water'. Together they form a unique fingerprint.

  • Cite this