NSUF 16-813: Characterization of ferritic steels Fe-9Cr and 9Cr2WYT ODS alloys irradiated in ATR
Development of advanced fuel claddings and structural materials that can withstand nuclear reactor environments is crucial for the license extension of current nuclear reactors and the design of future advanced reactor concepts. Under irradiation, the formation of defect clusters and irradiation-induced solute redistribution can significantly degrade the mechanical properties of materials [1]. Odette et al. [2] reported that the nanofeatures (NFs) in nanostructured ferritic alloys (NFAs) can trap helium bubbles and suppress the fast fracture embrittlement at low temperatures, and also pointed out that understanding the detailed nature of NFs and their influence on the microstructure and mechanical properties are still challenging. We will use innovative in-situ approaches to simultaneously observe the deformation-induced microstructure evolution of neutron irradiated Fe-9Cr and 9Cr2WYT ODS alloys in scanning electron microscope (SEM) and transmission electron microscope (TEM). Before working on mechanical testing of the irradiated samples, we need perform the post-irradiation examination for the neutron irradiated Fe-9Cr and 9Cr2WYT ODS alloys. In this proposal, we propose to use TEM to examine the irradiation-induced microstructure, especially the nature of dislocation loops, of irradiated samples, and use Atomic Probe Tomography (APT) to study the evolution of the chemical composition of the oxide particles after neutron irradiation.
Additional Info
| Field | Value |
|---|---|
| Abstract | Development of advanced fuel claddings and structural materials that can withstand nuclear reactor environments is crucial for the license extension of current nuclear reactors and the design of future advanced reactor concepts. Under irradiation, the formation of defect clusters and irradiation-induced solute redistribution can significantly degrade the mechanical properties of materials [1]. Odette et al. [2] reported that the nanofeatures (NFs) in nanostructured ferritic alloys (NFAs) can trap helium bubbles and suppress the fast fracture embrittlement at low temperatures, and also pointed out that understanding the detailed nature of NFs and their influence on the microstructure and mechanical properties are still challenging. We will use innovative in-situ approaches to simultaneously observe the deformation-induced microstructure evolution of neutron irradiated Fe-9Cr and 9Cr2WYT ODS alloys in scanning electron microscope (SEM) and transmission electron microscope (TEM). Before working on mechanical testing of the irradiated samples, we need perform the post-irradiation examination for the neutron irradiated Fe-9Cr and 9Cr2WYT ODS alloys. In this proposal, we propose to use TEM to examine the irradiation-induced microstructure, especially the nature of dislocation loops, of irradiated samples, and use Atomic Probe Tomography (APT) to study the evolution of the chemical composition of the oxide particles after neutron irradiation. |
| Award Announced Date | 2016-12-16T07:46:35.02 |
| Awarded Institution | None |
| Facility | None |
| Facility Tech Lead | Yaqiao Wu |
| Irradiation Facility | None |
| PI | Cheng Sun |
| PI Email | [email protected] |
| Project Type | RTE |
| RTE Number | 813 |