In situ and ex situ characterisation of oxide films formed on strained stainless steel surfaces in high-temperature water

Yoichi Takeda, Tetsuo Shoji, Martin Bojinov (Corresponding Author), Petri Kinnunen, Timo Saario

    Research output: Contribution to journalArticleScientificpeer-review

    21 Citations (Scopus)

    Abstract

    A possible approach in describing the role of the environment in the phenomena behind initiation and propagation of a stress corrosion crack is to assume that the transport of matter and charge through the oxide film on the material is one of the rate-controlling factors. Straining of the bulk material may affect the transport rates of ionic defects, such as vacancies and interstitials, through the oxide film. The aim of the present work has been to verify the applicability of combined slow strain rate tests (SSRT) and contact electric resistance (CER) measurements to assess the influence of strain on the electric properties of oxide films on AISI 316L stainless steel with or without prior cold work in simulated boiling water reactor (BWR) coolant conditions. The SSRT-CER measurements have been combined with ex situ characterisation of the oxide films after experiments using electron spectroscopy for chemical analysis (ESCA) and scanning electron microscopy (SEM). The results suggest that the effect of strain on the resistance of the oxide films seems to correlate with the effect of the same parameter on the Cr(III) concentration in the inner layer of the oxide. In addition, important differences between the concentration of Ni and Fe in the outer layer formed on stressed and unstressed surface have been observed. Based on the mixed-conduction model for oxide films, an attempt is made to evaluate the effect of straining on the electric properties of the oxide films and to correlate these effects with the changes in film composition and structure.
    Original languageEnglish
    Pages (from-to)8580-8588
    Number of pages9
    JournalApplied Surface Science
    Volume252
    Issue number24
    DOIs
    Publication statusPublished - 2006
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Stainless Steel
    Oxide films
    Stainless steel
    Water
    Electric resistance measurement
    Temperature
    Strain rate
    Electric properties
    Boiling water reactors
    Electron spectroscopy
    Chemical analysis
    Coolants
    Oxides
    Vacancies
    Corrosion
    Cracks
    Defects
    Scanning electron microscopy

    Keywords

    • stainless steel
    • simulated nuclear reactor coolant
    • contact electric resistance
    • slow strain rate test
    • oxide film
    • kinetic model

    Cite this

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    title = "In situ and ex situ characterisation of oxide films formed on strained stainless steel surfaces in high-temperature water",
    abstract = "A possible approach in describing the role of the environment in the phenomena behind initiation and propagation of a stress corrosion crack is to assume that the transport of matter and charge through the oxide film on the material is one of the rate-controlling factors. Straining of the bulk material may affect the transport rates of ionic defects, such as vacancies and interstitials, through the oxide film. The aim of the present work has been to verify the applicability of combined slow strain rate tests (SSRT) and contact electric resistance (CER) measurements to assess the influence of strain on the electric properties of oxide films on AISI 316L stainless steel with or without prior cold work in simulated boiling water reactor (BWR) coolant conditions. The SSRT-CER measurements have been combined with ex situ characterisation of the oxide films after experiments using electron spectroscopy for chemical analysis (ESCA) and scanning electron microscopy (SEM). The results suggest that the effect of strain on the resistance of the oxide films seems to correlate with the effect of the same parameter on the Cr(III) concentration in the inner layer of the oxide. In addition, important differences between the concentration of Ni and Fe in the outer layer formed on stressed and unstressed surface have been observed. Based on the mixed-conduction model for oxide films, an attempt is made to evaluate the effect of straining on the electric properties of the oxide films and to correlate these effects with the changes in film composition and structure.",
    keywords = "stainless steel, simulated nuclear reactor coolant, contact electric resistance, slow strain rate test, oxide film, kinetic model",
    author = "Yoichi Takeda and Tetsuo Shoji and Martin Bojinov and Petri Kinnunen and Timo Saario",
    note = "Project code: G5SU01038",
    year = "2006",
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    language = "English",
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    pages = "8580--8588",
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    In situ and ex situ characterisation of oxide films formed on strained stainless steel surfaces in high-temperature water. / Takeda, Yoichi; Shoji, Tetsuo; Bojinov, Martin (Corresponding Author); Kinnunen, Petri; Saario, Timo.

    In: Applied Surface Science, Vol. 252, No. 24, 2006, p. 8580-8588.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - In situ and ex situ characterisation of oxide films formed on strained stainless steel surfaces in high-temperature water

    AU - Takeda, Yoichi

    AU - Shoji, Tetsuo

    AU - Bojinov, Martin

    AU - Kinnunen, Petri

    AU - Saario, Timo

    N1 - Project code: G5SU01038

    PY - 2006

    Y1 - 2006

    N2 - A possible approach in describing the role of the environment in the phenomena behind initiation and propagation of a stress corrosion crack is to assume that the transport of matter and charge through the oxide film on the material is one of the rate-controlling factors. Straining of the bulk material may affect the transport rates of ionic defects, such as vacancies and interstitials, through the oxide film. The aim of the present work has been to verify the applicability of combined slow strain rate tests (SSRT) and contact electric resistance (CER) measurements to assess the influence of strain on the electric properties of oxide films on AISI 316L stainless steel with or without prior cold work in simulated boiling water reactor (BWR) coolant conditions. The SSRT-CER measurements have been combined with ex situ characterisation of the oxide films after experiments using electron spectroscopy for chemical analysis (ESCA) and scanning electron microscopy (SEM). The results suggest that the effect of strain on the resistance of the oxide films seems to correlate with the effect of the same parameter on the Cr(III) concentration in the inner layer of the oxide. In addition, important differences between the concentration of Ni and Fe in the outer layer formed on stressed and unstressed surface have been observed. Based on the mixed-conduction model for oxide films, an attempt is made to evaluate the effect of straining on the electric properties of the oxide films and to correlate these effects with the changes in film composition and structure.

    AB - A possible approach in describing the role of the environment in the phenomena behind initiation and propagation of a stress corrosion crack is to assume that the transport of matter and charge through the oxide film on the material is one of the rate-controlling factors. Straining of the bulk material may affect the transport rates of ionic defects, such as vacancies and interstitials, through the oxide film. The aim of the present work has been to verify the applicability of combined slow strain rate tests (SSRT) and contact electric resistance (CER) measurements to assess the influence of strain on the electric properties of oxide films on AISI 316L stainless steel with or without prior cold work in simulated boiling water reactor (BWR) coolant conditions. The SSRT-CER measurements have been combined with ex situ characterisation of the oxide films after experiments using electron spectroscopy for chemical analysis (ESCA) and scanning electron microscopy (SEM). The results suggest that the effect of strain on the resistance of the oxide films seems to correlate with the effect of the same parameter on the Cr(III) concentration in the inner layer of the oxide. In addition, important differences between the concentration of Ni and Fe in the outer layer formed on stressed and unstressed surface have been observed. Based on the mixed-conduction model for oxide films, an attempt is made to evaluate the effect of straining on the electric properties of the oxide films and to correlate these effects with the changes in film composition and structure.

    KW - stainless steel

    KW - simulated nuclear reactor coolant

    KW - contact electric resistance

    KW - slow strain rate test

    KW - oxide film

    KW - kinetic model

    U2 - 10.1016/j.apsusc.2005.11.073

    DO - 10.1016/j.apsusc.2005.11.073

    M3 - Article

    VL - 252

    SP - 8580

    EP - 8588

    JO - Applied Surface Science

    JF - Applied Surface Science

    SN - 0169-4332

    IS - 24

    ER -