Abstract
SA508 cl.3 reactor pressure vessel steel plates were overlay cladded with type ER309L welding consumables by submerged arc welding. The microstructure of the clad was composed of fee austenite, a few percent of bcc δ-ferrite and brittle σ phase. The irradiation-induced hardening and its related mechanical property changes of the clad were investigated using tensile, small punch (SP) and electrical resistivity measurements. Neutron fluences of irradiated specimens at 290 °C were ranged from ∼5 × 1018 to ∼5 × 1019 n/cm2 (>1MeV). Not only yield stress but electrical resistivity were increased with irradiation and the δ-ferrite showed an approximately 1.5 times higher hardening than the austenite matrix. The general hardening may come from the irradiation-produced fine size defect clusters in the austenite matrix. The SP ductile/brittle transition temperature (SP-DBTT) moved to higher temperature with irradiation, and the SP-DBTT was substantially influenced by the amount of brittle CT phase.
| Original language | English |
|---|---|
| Pages (from-to) | 4477-4482 |
| Number of pages | 6 |
| Journal | Materials Science Forum |
| Volume | 426-432 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2003 |
| Event | Thermec 2003 Processing and Manufacturing of Advanced Materials - Madrid, Spain Duration: 2003 Jul 7 → 2003 Jul 11 |
Keywords
- Irradiation hardening
- RPV clad
- SP-DBTT
- δ-ferrite
- σ phase