Z-phase in 9-12% Cr Steels

Hilmar Danielsen, John Hald

    Research output: Book/ReportReportResearch

    Abstract

    The complex nitride Z-phase, Cr(V,Nb)N, has recently been identified as a major cause for premature breakdown in creep strength of a number of new 9-12%Cr martensitic steels. A thermodynamic model of the Z-phase has been created based on the Thermo-Calc software. The model predicts the Z-phase to be stable in all of the new 9-12%Cr martensitic steels. This has generally been confirmed by the performed experiments. Z-phase precipitation seems to be a kinetic problem, and drivning force calculations using Thermo-Calc with the developed model have been used to predict steel compositions, which will delay Z-phase precipitation.
    Original languageEnglish
    Number of pages47
    Publication statusPublished - 2004

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