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Journal article

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

By Hald, John1,2

From

Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark1

Department of Mechanical Engineering, Technical University of Denmark2

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.

Language: English
Year: 2008
Pages: 30-37
ISSN: 18793541 and 03080161
Types: Journal article
DOI: 10.1016/j.ijpvp.2007.06.010
ORCIDs: Hald, John
Keywords

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

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