Journal article
Review of Z phase precipitation in 9–12 wt-%Cr steels
For high temperature applications, 9–12 wt-%Cr steels in fossil fired power plants rely upon precipitate strengthening from (V,Nb)N MX nitrides for long term creep strength. During prolonged exposure at service temperature, another nitride precipitates: Cr(V,Nb)NZ phase. The Z phases lowly replaceMX, eventually causing a breakdown in creep strength.
The present paper reviews the Z phase and its behaviour in 9–12 wt-%Cr steels including thermodynamic modelling, crystal structure, nucleation process and precipitation rate as a function of chemical composition. The influence of Z phase precipitation upon long term creep strength is assessed from several different 9–12wt-%Cr steel grades and alloy design philosophies.
Language: | English |
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Publisher: | Taylor & Francis |
Year: | 2016 |
Pages: | 126-137 |
ISSN: | 17432847 and 02670836 |
Types: | Journal article |
DOI: | 10.1179/1743284715Y.0000000066 |
ORCIDs: | Danielsen, Hilmar Kjartansson |