The effect of Ni and Si additions on the oxidation behaviour of Co-17Re-18Cr alloys
Source abstract
Abstract
Abstract The present study deals with the oxidation behaviour of three Co-17Re-18Cr-XNi (X = 8, 15, 25 at.%) alloys and one Co-17Re-18Cr-15Ni-2Si alloy in the temperature range 800 °C–1100 °C. The experimental results reveal improved oxidation resistance with increasing Ni concentration. It seems that Ni enhances the diffusion of Cr. However, higher Ni concentrations accelerate the formation of the Cr-rich σ phase detracting significant amounts of Cr from the matrix and deteriorating the corrosion resistance. Results of the oxidation tests reveal a positive effect of Si on the oxidation behaviour at 900 °C–1100 °C. It was found that Si enhances the Cr activity, though, facilitating the formation of the σ phase.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: High-Temperature Coating Behaviors · High Temperature Alloys and Creep · Intermetallics and Advanced Alloy Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (21)
Show source-provided references
1. High temperature scaling of cobalt-chromium alloys10.1149/1.2430374 ↗
2. Oxidation behaviour of experimental Co-Re-base alloys in laboratory air at 1000 °C10.3139/146.101792 ↗
3. Co-Re-based alloys: a new class of high temperature materials?10.1002/adem.200700132 ↗
4. Beyond Ni-based superalloys: development of CoRe-based alloys for gas turbine applications at very high temperatures10.3139/146.110563 ↗
5. Metallic materials for structural application beyond nickel-based superalloys10.1007/s11837-009-0106-7 ↗
6. The effect of alloyed Ni addition on the short-term high temperature oxidation behaviour of Co-Re-Cr-based alloys10.1016/j.corsci.2015.01.004 ↗
7. The effect of Ni additions on the oxidation behaviour of Co-Re-Cr high-temperature alloys10.1080/09603409.2017.1392111 ↗
8. Influence of σ phase on the allotropic transformation of the matrix in Co-Re-Cr-Based alloys with Ni addition10.3390/met8090706 ↗
9. K. Esleben, B. Gorr, H.-J. Christ, D. Mukherji, J. Rösler, Effect of Cr and Ni on the microstructure evolution in Co-Re-Cr-Ni alloys, Int. J. Mat. Res., submitted for publication.
10. The effect of reactive element additions on the selective oxidation, growth and adhesion of chromia scales10.1016/0921-5093(95)09798-8 ↗
11. Effects of Silicon on the oxidation behavior of Ni-base chromia-forming alloys10.1007/s11085-006-9003-4 ↗
12. The effect of small amounts of Silicon on the oxidation of high-purity Co-25wt.% Cr at elevated temperatures10.1007/BF00611689 ↗
13. Silicon contamination effects in the oxidation of carbide-containing cobalt-chromium alloys10.1002/(SICI)1521-4176(199812)49:12<855::AID-MACO855>3.0.CO;2-5 ↗
14. Improvements in high temperature oxidation resistance by additions of reactive elements or oxide dispersions
15. Effect of Si addition on the oxidation resistance of Co-Re-Cr-alloys: recent attainments in the development of novel alloys10.3139/146.110626 ↗
16. Microstructure and oxidation mechanism evolution of Co-17Re-25Cr-2Si in the temperature range 800–1100°C10.1007/s11085-014-9515-2 ↗
17. Oxidation behaviour of model cobalt-rhenium alloys during short-term exposure to laboratory air at elevated temperature10.1007/s11085-008-9133-y ↗
18. Reaktionstypen bei der Oxydation von Legierungen
19. Diffusion and the structure of metals10.1007/BF00814533 ↗
20. The activation energy for lattice self-diffusion and the engel-brewer theory10.1007/BF02658053 ↗
21. Mechanism of breakaway oxidation of Fe-Cr and Fe-Cr-Ni alloys in dry and wet carbon dioxide