Abstract
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.
Original language | English |
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Journal | International Journal of Pressure Vessels and Piping |
Volume | 85 |
Issue number | 1-2 |
Pages (from-to) | 30-37 |
ISSN | 0308-0161 |
DOIs | |
Publication status | Published - 2008 |
Keywords
- Z-phase
- Precipitate stability modelling
- Laves phase
- Long-term creep stability
- MX nitrides
- Creep mechanisms
- Precipitate characterisation
- 9–12% Cr steels