Abstract
Post-irradiation creep behavior was investigated for a low activation 9%Cr-2%W martensitic steel. Neutron irradiation (6 × 10 24 n/m 2) reduced the creep rate, resulting in an increase in creep rupture time in this steel. The amount of the increase in creep rupture times depends on neutron fluence, test temperature and initial applied stress. A higher initial applied stress and fluence and a lower test temperature increased the rupture time. Post-irradiation annealing behavior of tensile properties suggested that irradiation defects which contributed to the decrease in creep rate were easily annealed out during creep tests. The post-irradiation creep behavior of low activation 9%Cr-2%W martensitic steel was interpreted in terms of the irradiation-induced suppression of dislocation climb and the annealing out of irradiation defects during tests.
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