|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Nanostructured Materials for Nuclear Applications
||Response of Equal Channel Angular Extrusion Processed Ultrafine Grained T91 Steel Subjected to High Temperature Heavy Ion Irradiation
||Miao Song, Di Chen, Yuedong Wu, Youxing Chen, Lin Shao, Yong Yang, Karl T Hartwig, Xinghang Zhang
|On-Site Speaker (Planned)
We performed Fe ion irradiation to 150 dpa at 450 °C on bulk coarse grained (CG, with grain size of ~ 2 μm) and ultra-fine grained (UFG, with grain size of ~ 320 nm) T91 steels. Extensive microscopy studies show that fine grains in UFG T91 reduced the density of nanocavities and dislocation loops. The swelling rate in UFG steel is three times lower than that of CG T91 due to the existence of abundant defect sinks, such as high angle grain boundaries and dislocations. A strong surface effect with size dependence was noted during heavy ion irradiation studies. The large deviation of swelling rate from neutron irradiated specimens implies the significance of He concentration and presumably dose rate on swelling in nuclear reactors.
||Planned: A print-only volume