Environmental effects on irradiation creep behavior of highly purified V-4Cr-4Ti alloys (NIFS-Heats) irradiated by neutrons

摘要

In order to investigate the effect of the environment on the irradiation creep properties ofhighly purified V-4Cr-4Ti alloys, neutron irradiation experiments with sodium-enclosed irradiationcapsules in Joyo and lithium-enclosed irradiation capsules in HFIR-17J were carried out usingpressurized creep tubes (PCTs).It was found that the creep strain rate exhibited a linear relationship with the effective stressup to 150 MPa at 458°C and 598°C in the Joyo irradiation experiments. For HFIR-17J irradiationat 425°C, the creep strain rate also exhibited a linear relationship with the effective stress up to150 MPa. The activation energy of the irradiation creep and irradiation creep stress factor wereestimated to be 46 kJ/mol·K and 1 to 2, respectively. No significant difference in the irradiationcreep behavior between liquid-sodium and liquid-lithium environments could be seen.