Microstructural degradation in compound tubes

Jorma Salonen, Pertti Auerkari

    Research output: Book/ReportReport

    Abstract

    In order to quantify microstructural degradation at high temperatures, samples of SA 210 / AISI 304 L compound tube material were annealed in the temperature range 540 - 720°C for 1 to 1 000 hours. The hardness of the annealed material was measured and the microstructure of the samples was investigated with optical and scanning electron microscopy. Microstructural degradation was characterised by the carbide structure in the ferritic-pearlitic base material and by the depth of decarburised and carburised zones of the compound tube interface. The observed changes were quantified in terms of their time and temperature dependence and diffusion coefficients of the process. The results can be used in estimating the extent of thermal exposure of high-temperature components after long-term service or after incidences of overheating.
    Original languageEnglish
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages29
    ISBN (Print)951-38-4937-6
    Publication statusPublished - 1996
    MoE publication typeNot Eligible

    Publication series

    SeriesVTT Publications
    Number279
    ISSN1235-0621

    Fingerprint

    degradation
    tubes
    carbides
    time dependence
    estimating
    hardness
    diffusion coefficient
    incidence
    temperature dependence
    microstructure
    scanning electron microscopy
    coefficients
    temperature

    Keywords

    • microstructure
    • degradation
    • thermal degradation
    • tubes
    • temperature
    • materials
    • hardness
    • measurement
    • microscopes
    • carbides
    • carburizing

    Cite this

    Salonen, J., & Auerkari, P. (1996). Microstructural degradation in compound tubes. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 279
    Salonen, Jorma ; Auerkari, Pertti. / Microstructural degradation in compound tubes. Espoo : VTT Technical Research Centre of Finland, 1996. 29 p. (VTT Publications; No. 279).
    @book{5b51bc5cacf4453d9b195ee0fa1d16c3,
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    abstract = "In order to quantify microstructural degradation at high temperatures, samples of SA 210 / AISI 304 L compound tube material were annealed in the temperature range 540 - 720°C for 1 to 1 000 hours. The hardness of the annealed material was measured and the microstructure of the samples was investigated with optical and scanning electron microscopy. Microstructural degradation was characterised by the carbide structure in the ferritic-pearlitic base material and by the depth of decarburised and carburised zones of the compound tube interface. The observed changes were quantified in terms of their time and temperature dependence and diffusion coefficients of the process. The results can be used in estimating the extent of thermal exposure of high-temperature components after long-term service or after incidences of overheating.",
    keywords = "microstructure, degradation, thermal degradation, tubes, temperature, materials, hardness, measurement, microscopes, carbides, carburizing",
    author = "Jorma Salonen and Pertti Auerkari",
    note = "Project code: VAL45023",
    year = "1996",
    language = "English",
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    Salonen, J & Auerkari, P 1996, Microstructural degradation in compound tubes. VTT Publications, no. 279, VTT Technical Research Centre of Finland, Espoo.

    Microstructural degradation in compound tubes. / Salonen, Jorma; Auerkari, Pertti.

    Espoo : VTT Technical Research Centre of Finland, 1996. 29 p. (VTT Publications; No. 279).

    Research output: Book/ReportReport

    TY - BOOK

    T1 - Microstructural degradation in compound tubes

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    AU - Auerkari, Pertti

    N1 - Project code: VAL45023

    PY - 1996

    Y1 - 1996

    N2 - In order to quantify microstructural degradation at high temperatures, samples of SA 210 / AISI 304 L compound tube material were annealed in the temperature range 540 - 720°C for 1 to 1 000 hours. The hardness of the annealed material was measured and the microstructure of the samples was investigated with optical and scanning electron microscopy. Microstructural degradation was characterised by the carbide structure in the ferritic-pearlitic base material and by the depth of decarburised and carburised zones of the compound tube interface. The observed changes were quantified in terms of their time and temperature dependence and diffusion coefficients of the process. The results can be used in estimating the extent of thermal exposure of high-temperature components after long-term service or after incidences of overheating.

    AB - In order to quantify microstructural degradation at high temperatures, samples of SA 210 / AISI 304 L compound tube material were annealed in the temperature range 540 - 720°C for 1 to 1 000 hours. The hardness of the annealed material was measured and the microstructure of the samples was investigated with optical and scanning electron microscopy. Microstructural degradation was characterised by the carbide structure in the ferritic-pearlitic base material and by the depth of decarburised and carburised zones of the compound tube interface. The observed changes were quantified in terms of their time and temperature dependence and diffusion coefficients of the process. The results can be used in estimating the extent of thermal exposure of high-temperature components after long-term service or after incidences of overheating.

    KW - microstructure

    KW - degradation

    KW - thermal degradation

    KW - tubes

    KW - temperature

    KW - materials

    KW - hardness

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    KW - microscopes

    KW - carbides

    KW - carburizing

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    ER -

    Salonen J, Auerkari P. Microstructural degradation in compound tubes. Espoo: VTT Technical Research Centre of Finland, 1996. 29 p. (VTT Publications; No. 279).