Post-irradiation annealing (PIA) was conducted to investigate the cause of irradiation-assisted stress corrosion cracking (IASCC). The effects of PIA on irradiation hardening, dislocation channel formation, and IASCC susceptibility were examined for a 304L stainless steel irradiated to 5.9 dpa in the Barseback-1 reactor (Sweden). The annealing treatments were performed at temperatures in the range 450-600 degrees C and times ranging from 1-20 h. Longer annealing times and higher temperatures, as represented by iron diffusion distance, resulted in a significant reduction in irradiation hardening. IASCC susceptibility was measured for the as-irradiated and two PIA conditions (500 degrees C: 1 h and 550 degrees C: 20 h) via interrupted CERT tests under simulated BWR-NWC conditions. The annealing treatments progressively reduced IASCC susceptibility (as measured by the final intergranular fracture fraction) and dislocation channel density.
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页码:1015 / 1026
页数:12
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Asano K., 1995, 7th Int. Conf. Environ. Degrad. Mater. Nucl. Power Syst, P1033