Abstract
A systematic approach to measuring radiation-induced segregation (RIS) was used on four ferritic-martensitic (F-M) alloys: T91, HCM12A, HT9, and a Fe-9Cr model alloy, irradiated with 2.0 MeV protons over a range of doses (1-10 dpa) and temperatures (300-700 C). The experimental conditions are established so as to isolate the dependence of RIS on the experimental parameters: temperature, dose and bulk composition. RIS is measured at prior austenite grain boundaries (PAGBs) using the STEM/EDX technique. Chromium is found to enrich at PAGBs in all conditions with the exception being T91 irradiated to 3 dpa at 700 C. The magnitude of enrichment is small (<2 at%). Minor elements Si, Ni, and Cu also enrich consistently. A bell-shaped temperature dependence of RIS is observed in all elements. The amount of Cr enrichment decreases as a function of increasing bulk Cr concentration. Lastly, it is found that the 9Cr model alloy reaches a steady-state Cr RIS behavior at approximately 7 dpa, while the T91 reaches what may be a steady state near 3 dpa, then the amount of enrichment decreases at 10 dpa.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 7-16 |
| Number of pages | 10 |
| Journal | Journal of Nuclear Materials |
| Volume | 442 |
| Issue number | 1-3 |
| DOIs | |
| State | Published - 2013 |
| Externally published | Yes |
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- General Materials Science
- Nuclear Energy and Engineering