Abstract
In order to increase the corrosion resistance and simultaneously maintain the creep resistance of 9-12% Cr steels at 650 °C, a new alloy design concept was proposed, using thermodynamically stable Z-phase (CrTaN) precipitates to strengthen the steel. A new trial Z-phase strengthened 12% Cr steel was produced and creep tested. The steel exhibited good long-term creep resistance. Dense nano-sized Z-phase precipitates were formed at an early stage, and coarsened slowly. They remained small after more than 10,000 h.
| Original language | English |
|---|---|
| Pages (from-to) | 93-96 |
| Number of pages | 4 |
| Journal | Scripta Materialia |
| Volume | 113 |
| DOIs | |
| State | Published - 2016 |
| Externally published | Yes |
Funding
Financial support by the Swedish Energy Agency (contract number 31139-1), and Siemens Industrial Turbomachinery AB through the Swedish research program KME (contract numbers: 510 and 710), and the Research Foundation of VGB (contract number: 348) in Germany is gratefully acknowledged. The authors thank Dr. Hilmar Danielsen for fruitful discussions.
Keywords
- Creep
- Martensitic steels
- Three-dimensional atom probe
- Transmission electron microscopy
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