Abstract
The effect of irradiation on the tensile properties of 12Cr-1MoVW steel given two different normalized-and-tempered heat treatments was determined for specimens irradiated in the Experimental Breeder Reactor-II (EBR-II) at 390. 450, 500 and 550°C to ~13 dpa. Tensile tests were conducted at the irradiation temperature and room temperature on the irradiated specimens, as-heat-treated specimens, and as-heat-treated specimens thermally aged 5000 h at the irradiation temperature. Irradiation at 390°C increased the 0.2% yield stress and ultimate tensile strength above the strength of the unaged and aged controls for both heat-treated conditions. The effect was greater for the steel heat treated with the shorter austenitization and tempering times. The increased strength was accompanied by a slight decrease in ductility. After irradiation at 450, 500 and 550°C the yield stress, ultimate tensile strength, and ductility were similar to the as-heat-treated and the thermally aged controls. Strength changes were discussed in terms of microstructural changes observed in other studies.
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