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

    2 Citations (Scopus)


    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
    JournalMaterials at High Temperatures
    Issue number5-6
    Early online date2017
    Publication statusPublished - 2 Nov 2017
    MoE publication typeA1 Journal article-refereed


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


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