About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Advances in the State-of-the-Art of High Temperature Alloys
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| Presentation Title |
Microstructure and Strength of Additively Manufactured, Oxide Dispersion- and Precipitation-Strengthened Superalloys |
| Author(s) |
Andreas Bezold, Subham Chattoraj, Kojo Benefo, Calvin M. Stewart, Robert Hayes, Timothy M. Smith, Michael J. Mills |
| On-Site Speaker (Planned) |
Andreas Bezold |
| Abstract Scope |
Oxide dispersion-strengthened (ODS) superalloys attracted significant attention in the 1980s for their exceptional high-temperature creep strength but faced limitations due to manufacturing challenges. In recent years, advances in additive manufacturing have revived the interest in ODS-strengthened alloys. Among emerging strategies, the usage of resonant acoustic mixing to coat alloy powder with yttria enabled the production of crack-free, dense materials with finely dispersed Y₂O₃ nanoparticles through laser powder bed fusion. In this study, this approach is extended to precipitation-strengthened superalloys to achieve a synergistic combination of precipitation and ODS strengthening. After aging, the resulting alloys exhibit fine-grained substructures stabilized by MX carbides, Y₂O₃ oxides, and L1₂-ordered γ′ precipitates, alongside high dislocation densities. The microstructural evolution and mechanical performance of ODS-containing and ODS-free reference alloys after direct-aging as well as hot isostatic pressing followed by aging are evaluated through constant strain-rate and creep experiments across a range of temperatures. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Additive Manufacturing, Characterization |