期刊
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
卷 85, 期 1-2, 页码 30-37出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijpvp.2007.06.010
关键词
9-12% Cr steels; long-term creep stability; creep mechanisms; precipitate characterisation; precipitate stability modelling; laves phase; MX nitrides; Z-phase
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 NIX nitrides. High Cr contents of 10% and above in the steels accelerate Z-phase precipitation. (c) 2007 Elsevier Ltd. All rights reserved.
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