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 |
|---|---|
| Pages (from-to) | 79-84 |
| Number of pages | 6 |
| Journal | Materials Characterization |
| Volume | 102 |
| DOIs | |
| Publication status | Published - 2015 Apr 1 |
Bibliographical note
Funding Information:The authors gratefully acknowledge the financial support provided by the Korea Government Ministry of Knowledge Economy through the Korea Institute of Energy Technology Evaluation and Planning ( Grant No. 2012T100201597 ) and the Korea Institute of Science and Technology ( Grant No. 2E24692 ). The authors also thank Doosan Heavy Industries & Construction Co., Ltd. for providing the materials.
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