NSUF 17-1047: Examining microstructural differences in irradiated HT9, correlated with differences in processing prior to irradiation
The goal of this project is to do an examination of the irradiated microstructure of irradiated HT9, specifically analyzing for changes to the dislocation structure, precipitate distributions, and radiation-induced segregation. This is envisioned to be a first step in a deeper analysis of the variability of the radiation response of HT9 given different processing conditions.
TEM samples of each of the three heats of HT9, irradiated at 430°C to 8 dpa in the Advanced Test Reactor, plus unirradiated archive samples, will be prepared by electropolishing. Unirradiated samples will be prepared first to optimize the polishing conditions before moving to irradiated samples. Dislocation and large precipitate size distributions will be analyzed at the JEOL JEM 2010 TEM at the INL EML. Samples will be examined for voids but none are anticipated. Radiation-induced segregation and small (~<10 nm) precipitate size distributions will be measured using the FEI Titan Themis 200 scanning transmission electron microscope at the INL IMCL.
Six total samples will be examined, three irradiated and three unirradiated archive. Assuming 2.5 days per sample, this is 15 days of sample preparation plus TEM time.
Additional Info
| Field | Value |
|---|---|
| Awarded Institution | University of Wisconsin |
| Embargo End Date | 2026-02-27 |
| Facility Tech Lead | Alina Montrose, Mukesh Bachhav |
| NSUF Call | FY 2017 RTE 3rd Call |
| PI | Todd Allen |
| Project Member | Todd Allen, Professor - University of Wisconsin (https://orcid.org/0000-0002-2372-7259) |
| Project Notes | Awarded on 09/20/2017 |
| Project Type | RTE |
| Publication | Poster - Examining microstructural differences in irradiated HT9 correlated with differences in processing prior to irradiation Theresa Mary Green, Li He, Todd Allen, Brandon Miller, Lingfeng He NUMAT 2018 2018-10-15 - 2018-10-18 |
| Publication | Heat treatment Effects on Precipitation in Irradiated HT9 Steel Theresa Mary Green, Li He, Todd Allen MiNES (Materials in Nuclear Energy Systems) 2019 2019-10-06 - 2019-10-10 |
| RTE Number | 1047 |