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Journal article

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

By Cipolla, L.1; Danielsen, Hilmar Kjartansson2,3; Di Nunzio, P.E.1; Venditti, D.1; Hald, John2,3; Somers, Marcel A. J.2,3

From

Centro Sviluppo Materiali S.p.A.1

Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark2

Department of Mechanical Engineering, Technical University of Denmark3

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.

Language: English
Year: 2010
Pages: 324-327
ISSN: 18728456 and 13596462
Types: Journal article
DOI: 10.1016/j.scriptamat.2010.04.025
ORCIDs: Danielsen, Hilmar Kjartansson , Hald, John and Somers, Marcel A. J.
Keywords

Creep-resistant steels Nitrides TEM XRD

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