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

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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
Issue number1-2
Pages (from-to)30-37
Publication statusPublished - 2008


  • 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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