Microstructure and long-term creep properties of 9–12% Cr steels

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    Abstract

    Advanced microstructure characterisation and microstructure modelling has demonstrated that long-term microstructure stability in 9–12% Cr steels under technical loading conditions is equivalent to precipitate stability. Mo and W can have a positive influence on long-term creep strength of 9–12% Cr steels by Laves phase precipitation hardening. Unexpected breakdown of long-term creep stability of a number of alloys is caused by precipitation of the complex Z-phase nitride, which may completely dissolve fine V and Nb containing MX nitrides. High Cr contents of 10% and above in the steels accelerate Z-phase precipitation.
    Original languageEnglish
    JournalInternational Journal of Pressure Vessels and Piping
    Volume85
    Issue number1-2
    Pages (from-to)30-37
    ISSN0308-0161
    DOIs
    Publication statusPublished - 2008

    Keywords

    • Z-phase
    • Precipitate stability modelling
    • Laves phase
    • Long-term creep stability
    • MX nitrides
    • Creep mechanisms
    • Precipitate characterisation
    • 9–12% Cr steels

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