Abstract
The irradiation and annealing behavior of Chinese A508-3 reactor pressure vessel (RPV) steel (0.04 wt% Cu) after 3 MeV Fe-ion irradiation ranging from 0.1 to 20 dpa at room temperature (called RTRPV) and high temperature (250 °C, called HTRPV) was studied by positron annihilation Doppler broadening (PADB) spectroscopy and nano-indentation hardness. PADB showed that the density of vacancy-type defects was higher for low-temperature irradiations. The higher hardness was found after high-temperature irradiation because of the formation of solute clusters during irradiation. Positron annihilation measurements revealed the interaction and clustering of vacancies with solute clusters which were introduced by Fe-ion irradiation. For both RTRPVs and HTRPVs, the positron defect parameter and positron diffusion length showed the recovery of the irradiation-induced defects. Total recovery was observed after annealing at 450 °C.
| Original language | English |
|---|---|
| Pages (from-to) | 418-423 |
| Journal | Journal of Nuclear Science and Technology |
| Volume | 55 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2017 |
Keywords
- annealing
- Commercial RPV
- HTGR
- iron ion irradiation
- nano-indentation
- positron annihilation
- recovery