NSUF 14-501: Irradiation Effects in Oxide Nanoparticle Stability and Matrix Microstructure in ODS steel Neutron Irradiated to 3dpa at 500C
The interfaces between the ferritic steel matrix and the fine dispersion of complex Y-Ti oxide nanoparticles in the ferritic matrix of oxide dispersion strengthen (ODS) steels serve as point defect annihilation sites and trapping sites for helium transmutation product. Additionally, the nanoparticles serve as dislocation pinning sites and result in enhanced creep strength in these steels. Several microstructural metrics must be taken into consideration when analyzing ODS steels in terms of the stability, including size, size distribution and composition of the oxide nanoparticles, the dislocation structure and radiation-induced microstructural changes in the steel matrix. A detailed study of the influence of neutron irradiation on the microstructure of these steel is therefore fundamentally important for the successful deployment of these steels in future Gen IV fission reactors. In the proposed research, a 3 dpa neutron irradiated Fe-9%Cr ODS steel will be analyzed for radiation-induced microstructural and microchemical changes. A FEI Quanta 3 FIB-SEM will be used to prepare Transmission Electron Microscope (TEM) and Local Electrode Atom Probe (LEAP) samples. A Tecnai TF30-FEG STwin STEM will be used in order to evaluate the microstructural changes in the specimen. High Resolution TEM will be also employed to evaluate any structural changes of the particles after irradiation, including changes on the orientation relationship between the cluster and matrix. Scanning TEM coupled with Energy Dispersive Spectroscopy (EDS) will be used to evaluate preferential enrichment/depletion of the elements composing the sample along grain boundaries. The Local Electrode Atom Probe analysis will be used to evaluate the stability of the nanoclusters after irradiation, in terms of their size, size distribution and chemistry. The synergistic deployment of these atomic scale analytical techniques will help us to achieve a better understanding of the response of ODS steel when exposed to neutron radiation. Moreover, the radioactive nature of the samples makes the Microscopy and Characterization Suite (MaCS) located at the Center for Advanced Energy Studies (CAES) the ideal facility to perform this study. All the sample preparation and data collection will be performed in CAES in the month of October 2014, and the subsequent data analysis will be performed at the proposing university, the University of Wisconsin-Madison in the months of October and November 2014.
추가 정보
| 필드 | 값 |
|---|---|
| Abstract | The interfaces between the ferritic steel matrix and the fine dispersion of complex Y-Ti oxide nanoparticles in the ferritic matrix of oxide dispersion strengthen (ODS) steels serve as point defect annihilation sites and trapping sites for helium transmutation product. Additionally, the nanoparticles serve as dislocation pinning sites and result in enhanced creep strength in these steels. Several microstructural metrics must be taken into consideration when analyzing ODS steels in terms of the stability, including size, size distribution and composition of the oxide nanoparticles, the dislocation structure and radiation-induced microstructural changes in the steel matrix. A detailed study of the influence of neutron irradiation on the microstructure of these steel is therefore fundamentally important for the successful deployment of these steels in future Gen IV fission reactors. In the proposed research, a 3 dpa neutron irradiated Fe-9%Cr ODS steel will be analyzed for radiation-induced microstructural and microchemical changes. A FEI Quanta 3 FIB-SEM will be used to prepare Transmission Electron Microscope (TEM) and Local Electrode Atom Probe (LEAP) samples. A Tecnai TF30-FEG STwin STEM will be used in order to evaluate the microstructural changes in the specimen. High Resolution TEM will be also employed to evaluate any structural changes of the particles after irradiation, including changes on the orientation relationship between the cluster and matrix. Scanning TEM coupled with Energy Dispersive Spectroscopy (EDS) will be used to evaluate preferential enrichment/depletion of the elements composing the sample along grain boundaries. The Local Electrode Atom Probe analysis will be used to evaluate the stability of the nanoclusters after irradiation, in terms of their size, size distribution and chemistry. The synergistic deployment of these atomic scale analytical techniques will help us to achieve a better understanding of the response of ODS steel when exposed to neutron radiation. Moreover, the radioactive nature of the samples makes the Microscopy and Characterization Suite (MaCS) located at the Center for Advanced Energy Studies (CAES) the ideal facility to perform this study. All the sample preparation and data collection will be performed in CAES in the month of October 2014, and the subsequent data analysis will be performed at the proposing university, the University of Wisconsin-Madison in the months of October and November 2014. |
| Award Announced Date | 2014-08-11T00:00:00 |
| Awarded Institution | None |
| Facility | None |
| Facility Tech Lead | Yaqiao Wu |
| Irradiation Facility | None |
| PI | Alexander Mairov |
| PI Email | [email protected] |
| Project Type | RTE |
| RTE Number | 501 |