|About this Abstract
||Materials Science & Technology 2019
||Materials for Nuclear Applications
||Effect of Ultrasonic Nanocrystalline Surface Modification (UNSM) on the Oxidation Behavior of Alloy 800HT in a Supercritical Carbon Dioxide (SCO2) Environment
||Richard Chiang, Sebastien Teysseyre, Jeffery Aguiar, Lucas Teeter, Julie Tucker, Vijay Vasudevan
|On-Site Speaker (Planned)
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.
||Definite: At-meeting proceedings