Abstract
The effect of Nb addition on the creep strength of high-Cr martensitic heat-resistant steel was investigated at temperatures ranging from 839 to 894 K. The short-term creep properties were improved by Nb addition due to the enhanced MX precipitation. However, Nb addition deteriorated the steel's long-term stability resulting in an even shorter creep-rupture life than the original alloy. Onset of the accelerated degradation in Nb-containing steel was attributed to the gradual formation of Z-phase at the expense of M2N precipitates during creep exposure.
Original language | English |
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Pages (from-to) | 79-84 |
Number of pages | 6 |
Journal | Materials Characterization |
Volume | 102 |
DOIs | |
Publication status | Published - 2015 Apr 1 |
Keywords
- Creep strength
- Heat-resistant steels
- Precipitation
- XRD
- Z-phase
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering