|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Applications Utilizing Irradiation and Integrated Modeling
||Temperature Shift Evaluation for G-phase Clustering in Ferritic-martensitic Alloys
||Matthew J. Swenson, Saheed Bayonle Adisa
|On-Site Speaker (Planned)
||Matthew J. Swenson
The objective of this study is to evaluate the temperature shift requirement for high dose-rate ion irradiation to accurately emulate low dose-rate neutron irradiation in three ferritic-martensitic alloys. Historically, the temperature shift for using ion irradiations has been determined using the invariance theory, particularly for defect cluster evolution. However, it is unclear if the invariance theory also applies for solute cluster evolution. We have systematically characterized the size evolution of Si-Mn-Ni-rich nanoclusters in the ferritic-martensitic alloys HCM12A, HT9, and T91 following irradiations to 3 dpa at 500°C with either Fe2+ ions or neutrons. Two unique models each predict that Fe2+ ion irradiation at ~370°C will more accurately emulate G-phase evolution resulting from neutron irradiation at 500°C, representing a negative temperature shift. We have conducted the prescribed Fe2+ ion irradiation at 370°C to 3 dpa for comparison with neutron irradiation to 3 dpa at 500°C and will present the results.