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

    1 Citation (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

    Fingerprint

    Dissimilar metals
    Pressurized water reactors
    Steam
    Nickel
    Crack initiation
    Welds
    Water
    Metals
    Oxides
    Defects
    Oxidation

    Keywords

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

    Cite this

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    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.",
    keywords = "dissimilar metal weld, environmentally assisted cracking, nickel alloys, steam, stress corrosion cracking",
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    Environmentally assisted cracking crack initiation in nickel-based alloy dissimilar metal welds in doped and pure steam and pressurized water reactor water. / Toivonen, Aki; Hänninen, Hannu; Saukkonen, Tapio; Aaltonen, Pertti.

    In: Corrosion, Vol. 73, No. 7, 01.07.2017, p. 808-821.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Environmentally assisted cracking crack initiation in nickel-based alloy dissimilar metal welds in doped and pure steam and pressurized water reactor water

    AU - Toivonen, Aki

    AU - Hänninen, Hannu

    AU - Saukkonen, Tapio

    AU - Aaltonen, Pertti

    PY - 2017/7/1

    Y1 - 2017/7/1

    N2 - 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.

    AB - 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.

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    KW - environmentally assisted cracking

    KW - nickel alloys

    KW - steam

    KW - stress corrosion cracking

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