About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrahigh-Temperature Processing and Manufacturing
|
| Presentation Title |
High Temperature testing in low PO2 for the development of ultra-high temperature alloys |
| Author(s) |
Sebastien Dryepondt, Sam Bell, Charles Shane Hawkins, Sarah Graham, Tracie Lowe |
| On-Site Speaker (Planned) |
Sebastien Dryepondt |
| Abstract Scope |
High strength materials operating at temperatures >1200°C are critically needed for increasing the gas turbine operating temperature and efficiency. High temperature refractory alloys are promising candidates, and additive manufacturing has opened new opportunities for the fabrication of complex refractory components. The lack of oxidation resistance imposes the development of low PO2 testing capabilities, and significant variations in creep rates were observed for the Nb-based C-103 (Nb-10Hf-1Ti) alloy tested at 1300°C in high purity argon or vacuum. Cross-section micrographs revealed that oxygen ingress resulted in the formation of HfO2 precipitates after 100h in Argon at 1300°C. Similar creep tests performed on MHC (Mo-1.1Hf-0.1C) alloy at 1300°C revealed a lower sensitivity to oxygen for Mo-based alloys. Precise strain measurement was achieved in vacuum using digital image correlation (DIC), with laser engraving being used to produce speckle patterns. High throughput alloy testing via DIC and surface imaging in extreme environments will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Mechanical Properties, Environmental Effects |