| About this Abstract |
| Meeting |
Materials Science & Technology 2019
|
| Symposium
|
Materials for Nuclear Applications
|
| Presentation Title |
Effect of Ultrasonic Nanocrystalline Surface Modification (UNSM) on the Oxidation Behavior of Alloy 800HT in a Supercritical Carbon Dioxide (SCO2) Environment |
| Author(s) |
Richard Chiang, Sebastien Teysseyre, Jeffery Aguiar, Lucas Teeter, Julie Tucker, Vijay Vasudevan |
| On-Site Speaker (Planned) |
Richard Chiang |
| Abstract Scope |
UNSM was utilized in this initial study as a means to alter the surface reactivity of Alloy 800HT and induce surface/sub-surface structures that can readily supply Cr to the interface and reduce the effect of sensitization/carburization in a high temperature SCO2 environment (550°C; 20MPa; 500hrs). An observable increase in surface reactivity, dislocation density and reduction in surface/sub-surface grain size is apparent with notable influence on the development of the multi-layered oxide. Though more optimization of the UNSM treatment is required, reduction in sensitization and carbon at the oxide/matrix interface shows promise as a suitable method of mitigation against degradation. |