On the role of Nb in Z-phase formation in a 12% Cr steel

L. Cipolla, Hilmar Kjartansson Danielsen, P.E. Di Nunzio, D. Venditti, John Hald, Marcel A. J. Somers

    Research output: Contribution to journalJournal articleResearchpeer-review


    Z-phase precipitation in two model alloys, 12CrVNbN and 12CrVN, has been investigated. The alloys were aged up to 104 h and their precipitate evolution was followed by X-ray diffraction and transmission electron microscopy. The formation rate of Z-phase from vanadium-based nitrides, (V,Nb)N, in the Nb-containing alloy was observed to proceed considerably faster than in the Nb-free alloy. A hypothesis is put forward that explains the enhanced stability of VN in terms of changes in the interfacial energy of VN with the ferrite matrix.
    Original languageEnglish
    JournalScripta Materialia
    Issue number63
    Pages (from-to)324-327
    Publication statusPublished - 2010


    • TEM
    • Nitrides
    • Creep-resistant steels
    • XRD


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