PNNL

Abstract

This study examines the effect of tensile test temperatures ranging from 50C to 600C on the tensile properties of a modified 9Cr-1Mo ferritic steel after high energy proton irradiation at about 35C-67C to doses from 1 to 3 dpa and 9 dpa. For the specimens irradiated to doses between 1 and 3 dpa, it was observed that the yield strength and ultimate strength decreased monotonically as a function of tensile test temperature, whereas the uniform elongation remained at approximately 1% for tensile test temperatures up to 250C and then increased for tensile test temperatures up to and including 500C. At 600C, the uniform elongation was observed to be less than the values at 400C and 500C. Uniform elongation of the irradiated material tensile tested at 400C to 600C was observed to be greater than the values for the unirradiated material at the same temperatures. Tensile tests on the 9 dpa specimens followed similar trends.