Electrochemical investigation of in-service thermal aging in two CF8M cast stainless steels

Caitlin Huotilainen (Corresponding Author), Mykola Ivanchenko, Pål Efsing, Ulla Ehrnsten

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    In-service thermal aging of CF8M cast austenitic stainless steel was investigated in materials removed from the steam generator inlet and crossover elbows of the Ringhals 2 pressurized water reactor nuclear power plant unit after approximately 92kh of full operating time. The thermal aging of these materials was investigated using the double loop electrochemical potentiokinetic reactivation method, coupled with indentation hardness measurements and microstructural characterizations, to identify correlations between the electrochemical behavior and traditional methods of investigating thermal aging embrittlement effects in cast stainless steels. While this electrochemical method can be easily employed to quantify thermal aging effects in materials aged at higher temperatures (e.g. greater than 350∘C), this study highlights the difficulties encountered when electrochemically evaluating the aging of materials exposed to nuclear power plant operating conditions.
    Original languageEnglish
    Pages (from-to)34-40
    Number of pages7
    JournalJournal of Nuclear Materials
    Volume520
    DOIs
    Publication statusPublished - Jul 2019
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Thermal aging
    Stainless Steel
    casts
    stainless steels
    Stainless steel
    Nuclear power plants
    nuclear power plants
    Aging of materials
    Pressurized water reactors
    Embrittlement
    pressurized water reactors
    Steam generators
    Austenitic stainless steel
    Indentation
    embrittlement
    austenitic stainless steels
    boilers
    indentation
    Hardness
    crossovers

    Keywords

    • cast stainless steel
    • double loop electochemical potentiokinetic reactivation
    • G-phase
    • nanoindentation
    • spinodal decomposition
    • thermal aging

    Cite this

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    title = "Electrochemical investigation of in-service thermal aging in two CF8M cast stainless steels",
    abstract = "In-service thermal aging of CF8M cast austenitic stainless steel was investigated in materials removed from the steam generator inlet and crossover elbows of the Ringhals 2 pressurized water reactor nuclear power plant unit after approximately 92kh of full operating time. The thermal aging of these materials was investigated using the double loop electrochemical potentiokinetic reactivation method, coupled with indentation hardness measurements and microstructural characterizations, to identify correlations between the electrochemical behavior and traditional methods of investigating thermal aging embrittlement effects in cast stainless steels. While this electrochemical method can be easily employed to quantify thermal aging effects in materials aged at higher temperatures (e.g. greater than 350∘C), this study highlights the difficulties encountered when electrochemically evaluating the aging of materials exposed to nuclear power plant operating conditions.",
    keywords = "cast stainless steel, double loop electochemical potentiokinetic reactivation, G-phase, nanoindentation, spinodal decomposition, thermal aging",
    author = "Caitlin Huotilainen and Mykola Ivanchenko and P{\aa}l Efsing and Ulla Ehrnsten",
    year = "2019",
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    publisher = "Elsevier",

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    Electrochemical investigation of in-service thermal aging in two CF8M cast stainless steels. / Huotilainen, Caitlin (Corresponding Author); Ivanchenko, Mykola; Efsing, Pål; Ehrnsten, Ulla.

    In: Journal of Nuclear Materials, Vol. 520, 07.2019, p. 34-40.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Electrochemical investigation of in-service thermal aging in two CF8M cast stainless steels

    AU - Huotilainen, Caitlin

    AU - Ivanchenko, Mykola

    AU - Efsing, Pål

    AU - Ehrnsten, Ulla

    PY - 2019/7

    Y1 - 2019/7

    N2 - In-service thermal aging of CF8M cast austenitic stainless steel was investigated in materials removed from the steam generator inlet and crossover elbows of the Ringhals 2 pressurized water reactor nuclear power plant unit after approximately 92kh of full operating time. The thermal aging of these materials was investigated using the double loop electrochemical potentiokinetic reactivation method, coupled with indentation hardness measurements and microstructural characterizations, to identify correlations between the electrochemical behavior and traditional methods of investigating thermal aging embrittlement effects in cast stainless steels. While this electrochemical method can be easily employed to quantify thermal aging effects in materials aged at higher temperatures (e.g. greater than 350∘C), this study highlights the difficulties encountered when electrochemically evaluating the aging of materials exposed to nuclear power plant operating conditions.

    AB - In-service thermal aging of CF8M cast austenitic stainless steel was investigated in materials removed from the steam generator inlet and crossover elbows of the Ringhals 2 pressurized water reactor nuclear power plant unit after approximately 92kh of full operating time. The thermal aging of these materials was investigated using the double loop electrochemical potentiokinetic reactivation method, coupled with indentation hardness measurements and microstructural characterizations, to identify correlations between the electrochemical behavior and traditional methods of investigating thermal aging embrittlement effects in cast stainless steels. While this electrochemical method can be easily employed to quantify thermal aging effects in materials aged at higher temperatures (e.g. greater than 350∘C), this study highlights the difficulties encountered when electrochemically evaluating the aging of materials exposed to nuclear power plant operating conditions.

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    KW - double loop electochemical potentiokinetic reactivation

    KW - G-phase

    KW - nanoindentation

    KW - spinodal decomposition

    KW - thermal aging

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