Predicted life of P91 steel for cyclic high temperature service

Rami Pohja (Corresponding Author), Stefan Holmström, Pertti Auerkari, Asta Nurmela

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    The P91 steel is widely used in high temperature components of power plants, and it is a candidate material for Gen-IV reactors. The P91 steel has relatively attractive mechanical and physical properties combined with resistance to stress corrosion cracking in water-steam environments. This study aimed to explore the combined cyclic, creep and relaxation behaviour of P91 material. Uniaxial specimens were subjected to cyclic loadings with periodic forward creep or relaxation at peak stress. The results indicate that prior creep or intermediate relaxation periods up to 72 h will influence the subsequent cyclic softening of P91, but do not significantly reduce the cyclic life. In contrast, prior cycling has a detrimental effect on the subsequent creep life. A simplified creep-fatigue model is shown to predict life better than usual code-based approaches. Improved verification of all models would benefit from the availability of more extensive long-term data on P91 steel.
    Original languageEnglish
    Pages (from-to)301-310
    Number of pages10
    JournalMaterials at High Temperatures
    Volume34
    Issue number5-6
    Early online date2017
    DOIs
    Publication statusPublished - 2 Nov 2017
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Steel
    Creep
    steels
    stress corrosion cracking
    power plants
    steam
    softening
    Temperature
    availability
    physical properties
    reactors
    mechanical properties
    Steam
    Stress corrosion cracking
    cycles
    Power plants
    Physical properties
    water
    Availability
    Fatigue of materials

    Keywords

    • creep-fatigue
    • cyclic behaviour
    • P91 steel
    • stress relaxation

    Cite this

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    title = "Predicted life of P91 steel for cyclic high temperature service",
    abstract = "The P91 steel is widely used in high temperature components of power plants, and it is a candidate material for Gen-IV reactors. The P91 steel has relatively attractive mechanical and physical properties combined with resistance to stress corrosion cracking in water-steam environments. This study aimed to explore the combined cyclic, creep and relaxation behaviour of P91 material. Uniaxial specimens were subjected to cyclic loadings with periodic forward creep or relaxation at peak stress. The results indicate that prior creep or intermediate relaxation periods up to 72 h will influence the subsequent cyclic softening of P91, but do not significantly reduce the cyclic life. In contrast, prior cycling has a detrimental effect on the subsequent creep life. A simplified creep-fatigue model is shown to predict life better than usual code-based approaches. Improved verification of all models would benefit from the availability of more extensive long-term data on P91 steel.",
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    author = "Rami Pohja and Stefan Holmstr{\"o}m and Pertti Auerkari and Asta Nurmela",
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    Predicted life of P91 steel for cyclic high temperature service. / Pohja, Rami (Corresponding Author); Holmström, Stefan; Auerkari, Pertti; Nurmela, Asta.

    In: Materials at High Temperatures, Vol. 34, No. 5-6, 02.11.2017, p. 301-310.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Predicted life of P91 steel for cyclic high temperature service

    AU - Pohja, Rami

    AU - Holmström, Stefan

    AU - Auerkari, Pertti

    AU - Nurmela, Asta

    PY - 2017/11/2

    Y1 - 2017/11/2

    N2 - The P91 steel is widely used in high temperature components of power plants, and it is a candidate material for Gen-IV reactors. The P91 steel has relatively attractive mechanical and physical properties combined with resistance to stress corrosion cracking in water-steam environments. This study aimed to explore the combined cyclic, creep and relaxation behaviour of P91 material. Uniaxial specimens were subjected to cyclic loadings with periodic forward creep or relaxation at peak stress. The results indicate that prior creep or intermediate relaxation periods up to 72 h will influence the subsequent cyclic softening of P91, but do not significantly reduce the cyclic life. In contrast, prior cycling has a detrimental effect on the subsequent creep life. A simplified creep-fatigue model is shown to predict life better than usual code-based approaches. Improved verification of all models would benefit from the availability of more extensive long-term data on P91 steel.

    AB - The P91 steel is widely used in high temperature components of power plants, and it is a candidate material for Gen-IV reactors. The P91 steel has relatively attractive mechanical and physical properties combined with resistance to stress corrosion cracking in water-steam environments. This study aimed to explore the combined cyclic, creep and relaxation behaviour of P91 material. Uniaxial specimens were subjected to cyclic loadings with periodic forward creep or relaxation at peak stress. The results indicate that prior creep or intermediate relaxation periods up to 72 h will influence the subsequent cyclic softening of P91, but do not significantly reduce the cyclic life. In contrast, prior cycling has a detrimental effect on the subsequent creep life. A simplified creep-fatigue model is shown to predict life better than usual code-based approaches. Improved verification of all models would benefit from the availability of more extensive long-term data on P91 steel.

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