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Effect of Nb addition on Z-phase formation and creep strength in high-Cr martensitic heat-resistant steels
- Issue Date
- 4월-2015
- Publisher
- ELSEVIER SCIENCE INC
- Keywords
- Heat-resistant steels; Creep strength; Precipitation; Z-phase; XRD
- Citation
- MATERIALS CHARACTERIZATION, v.102, pp.79 - 84
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS CHARACTERIZATION
- Volume
- 102
- Start Page
- 79
- End Page
- 84
- ISSN
- 1044-5803
- 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 894K. 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. (C) 2015 Elsevier Inc. All rights reserved.
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