|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Mechanical Behavior and Degradation of Advanced Nuclear Fuel and Structural Materials
||Comparison of Neutron Irradiation Effects in PM-HIP and Cast Grade 91 Steel
||Sri Sowmya Panuganti, Yu Lu, Sheng Cheng, Megha Dubey, Yangyang Zhao, Caleb Clement, Donna P Guillen, David W Gandy, Janelle P Wharry
|On-Site Speaker (Planned)
||Sri Sowmya Panuganti
The purpose of this research is to compare irradiation effects in Grade 91 steel fabricated by casting versus powder metallurgy with hot isostatic pressing (PM-HIP). Grade 91 is a model ferritic steel proposed for advanced nuclear systems. PM-HIP components are of interest for nuclear applications because they are produced near-net shape, at lower cost, and have more uniform microstructures. But PM-HIP steels have not yet been thoroughly explored under irradiation. In this study, both PM-HIP and cast Grade 91 are irradiated in the Advanced Test Reactor to 1.0 and 3.0 dpa at 400oC. Tensile testing and nanoindentation reveal comparable irradiation hardening between PM-HIP and cast specimens, although the PM-HIP develops a yield-point phenomenon after irradiation. TEM and APT are used to characterize irradiation-induced dislocation loops and nanoclusters. Heterogeneous loop distributions and their role on source hardening will be discussed with respect to the yield-point phenomenon in the PM-HIP alloy.