About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Materials Under Extreme Environment
|
| Presentation Title |
Microstructural Evolution and Strength of 3D-printed Oxide-Dispersion and Precipitate Strengthened Superalloys |
| Author(s) |
Andreas Bezold, Subham Chattoraj, Kojo Benefo, Calvin M. Stewart, 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 stability and mechanical performance of ODS-containing and ODS-free reference alloys are evaluated through constant strain-rate and creep experiments across a range of temperatures. Special emphasis is placed on deformation mechanisms and solute segregation processes along defects |