In-service and simulated thermal transformation of steels for high temperature applications

P. Auerkari, S. Yli-Olli, S. Tuurna

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

    Abstract

    To characterize the actual local long term operating conditions, possible deviations in them and the material condition, it is essential to be able to understand and evaluate the time and temperature dependent change of high temperature structural materials of power and process plants. In this paper the thermal degradation of selected steels is discussed with comparison of materials extracted from plant after long term service and similar materials thermally exposed to simulating heat treatment (controlled annealing). In general, such comparisons can be used to assess for example the effective in-service temperatures. However, there are also caveats to consider, such as variation of the initial composition and heat treatments, impact of stress-activated component of diffusion, and the material-dependent differences in the kinetics of different aspects of microstructural degradation. Examples are given to illustrate the observed influence of these factors of uncertainty.
    Original languageEnglish
    Title of host publicationHeat treatment and surface engineering: from tradition to innovation
    Subtitle of host publicationEuropean Conference on Heat Treatment 2015 & 22nd IFHTSE congress
    PublisherAssociazione Italiana di Metallurgia AIM
    ISBN (Electronic)978-889899003-0
    Publication statusPublished - 2015
    MoE publication typeA4 Article in a conference publication
    EventEuropean Conference on Heat Treatment 2015 & 22nd IFHTSW Congress Heat Treatment and Surface Engineering - Venice, Italy
    Duration: 20 May 201522 May 2015

    Conference

    ConferenceEuropean Conference on Heat Treatment 2015 & 22nd IFHTSW Congress Heat Treatment and Surface Engineering
    CountryItaly
    CityVenice
    Period20/05/1522/05/15

    Fingerprint

    High temperature applications
    Steel
    Heat treatment
    Temperature
    Pyrolysis
    Annealing
    Degradation
    Kinetics
    Hot Temperature
    Chemical analysis

    Keywords

    • in-service
    • microstructure
    • prediction
    • steel
    • temperature
    • transformation

    Cite this

    Auerkari, P., Yli-Olli, S., & Tuurna, S. (2015). In-service and simulated thermal transformation of steels for high temperature applications. In Heat treatment and surface engineering: from tradition to innovation: European Conference on Heat Treatment 2015 & 22nd IFHTSE congress Associazione Italiana di Metallurgia AIM.
    Auerkari, P. ; Yli-Olli, S. ; Tuurna, S. / In-service and simulated thermal transformation of steels for high temperature applications. Heat treatment and surface engineering: from tradition to innovation: European Conference on Heat Treatment 2015 & 22nd IFHTSE congress. Associazione Italiana di Metallurgia AIM, 2015.
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    title = "In-service and simulated thermal transformation of steels for high temperature applications",
    abstract = "To characterize the actual local long term operating conditions, possible deviations in them and the material condition, it is essential to be able to understand and evaluate the time and temperature dependent change of high temperature structural materials of power and process plants. In this paper the thermal degradation of selected steels is discussed with comparison of materials extracted from plant after long term service and similar materials thermally exposed to simulating heat treatment (controlled annealing). In general, such comparisons can be used to assess for example the effective in-service temperatures. However, there are also caveats to consider, such as variation of the initial composition and heat treatments, impact of stress-activated component of diffusion, and the material-dependent differences in the kinetics of different aspects of microstructural degradation. Examples are given to illustrate the observed influence of these factors of uncertainty.",
    keywords = "in-service, microstructure, prediction, steel, temperature, transformation",
    author = "P. Auerkari and S. Yli-Olli and S. Tuurna",
    year = "2015",
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    booktitle = "Heat treatment and surface engineering: from tradition to innovation",
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    Auerkari, P, Yli-Olli, S & Tuurna, S 2015, In-service and simulated thermal transformation of steels for high temperature applications. in Heat treatment and surface engineering: from tradition to innovation: European Conference on Heat Treatment 2015 & 22nd IFHTSE congress. Associazione Italiana di Metallurgia AIM, European Conference on Heat Treatment 2015 & 22nd IFHTSW Congress Heat Treatment and Surface Engineering, Venice, Italy, 20/05/15.

    In-service and simulated thermal transformation of steels for high temperature applications. / Auerkari, P.; Yli-Olli, S.; Tuurna, S.

    Heat treatment and surface engineering: from tradition to innovation: European Conference on Heat Treatment 2015 & 22nd IFHTSE congress. Associazione Italiana di Metallurgia AIM, 2015.

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

    TY - GEN

    T1 - In-service and simulated thermal transformation of steels for high temperature applications

    AU - Auerkari, P.

    AU - Yli-Olli, S.

    AU - Tuurna, S.

    PY - 2015

    Y1 - 2015

    N2 - To characterize the actual local long term operating conditions, possible deviations in them and the material condition, it is essential to be able to understand and evaluate the time and temperature dependent change of high temperature structural materials of power and process plants. In this paper the thermal degradation of selected steels is discussed with comparison of materials extracted from plant after long term service and similar materials thermally exposed to simulating heat treatment (controlled annealing). In general, such comparisons can be used to assess for example the effective in-service temperatures. However, there are also caveats to consider, such as variation of the initial composition and heat treatments, impact of stress-activated component of diffusion, and the material-dependent differences in the kinetics of different aspects of microstructural degradation. Examples are given to illustrate the observed influence of these factors of uncertainty.

    AB - To characterize the actual local long term operating conditions, possible deviations in them and the material condition, it is essential to be able to understand and evaluate the time and temperature dependent change of high temperature structural materials of power and process plants. In this paper the thermal degradation of selected steels is discussed with comparison of materials extracted from plant after long term service and similar materials thermally exposed to simulating heat treatment (controlled annealing). In general, such comparisons can be used to assess for example the effective in-service temperatures. However, there are also caveats to consider, such as variation of the initial composition and heat treatments, impact of stress-activated component of diffusion, and the material-dependent differences in the kinetics of different aspects of microstructural degradation. Examples are given to illustrate the observed influence of these factors of uncertainty.

    KW - in-service

    KW - microstructure

    KW - prediction

    KW - steel

    KW - temperature

    KW - transformation

    M3 - Conference article in proceedings

    BT - Heat treatment and surface engineering: from tradition to innovation

    PB - Associazione Italiana di Metallurgia AIM

    ER -

    Auerkari P, Yli-Olli S, Tuurna S. In-service and simulated thermal transformation of steels for high temperature applications. In Heat treatment and surface engineering: from tradition to innovation: European Conference on Heat Treatment 2015 & 22nd IFHTSE congress. Associazione Italiana di Metallurgia AIM. 2015