|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Application Utilizing Test Reactors, Ion Beam Facilities and Integrated Modeling
||Impact of Temperature on Microstructural Features using Dual Ion-irradiation in T91 Steel
||Stephen Taller, Zhijie Jiao, Kevin G Field, Gary S Was
|On-Site Speaker (Planned)
High fidelity emulation of neutron irradiation microstructures using ion beams requires understanding the influence of temperature and damage level on the irradiated microstructure. Irradiations using 5 MeV Fe2+ ions to induce damage with co-injected He2+ to simulate transmutation gas buildup were performed at the Michigan Ion Beam Laboratory on a ferritic-martensitic alloy, T91, irradiated up to 35 dpa in a temperature range from 406°C to 480°C with helium co-injected in a ratio of 0.22 appm He/dpa. Cavities, precipitates and dislocation loops were characterized using S/TEM to understand the irradiated microstructure development with temperature and damage level. Dislocation loops were found to increase in diameter and decrease in density with increasing temperature. A small increase was found in the average cavity diameter but cavity density exhibited bell shaped behavior with irradiation temperature, peaking at an intermediate temperature of 445°C.
||Planned: Supplemental Proceedings volume