Abstract
Isothermal oxidation tests at 1150 °C show that the commercial grade of the single-crystal Ni-based superalloy CMSX-4 is superior to that of the CMSX-10 version. Superalloy CMSX-4 is observed to undergo a shorter stage of transient oxidation and to be able to form more protective oxides during the earlier stages of the reaction as compared to superalloy CMSX-10. This behavior is correlated with the difference in chemical composition between the two superalloys. A significant improvement in oxidation resistance of both superalloys is realized after diffusing a 10 μm thick layer of Pt into their surfaces to produce a Pt-rich surface layer of γ′-phase. However, the oxidation resistance of the composite Pt/CMSX-10 system becomes superior to that of the Pt/CMSX-4 system. Most evidence indicates that this is a reflection of the higher microstructural stability of the γ′-phase in superalloy CMSX-10 and the added beneficial effect provided by Pt.
| Original language | English |
|---|---|
| Pages (from-to) | 371-386 |
| Number of pages | 16 |
| Journal | Oxidation of Metals |
| Volume | 93 |
| Issue number | 3-4 |
| DOIs | |
| State | Published - 1 Apr 2020 |
Bibliographical note
Publisher Copyright:© 2020, Springer Science+Business Media, LLC, part of Springer Nature.
Keywords
- Electron microscopy
- Gamma prime
- Oxidation
- Platinum
- Superalloys
ASJC Scopus subject areas
- Inorganic Chemistry
- Metals and Alloys
- Materials Chemistry