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Tensile tests were performed on notched and unnotched 20 percent cold worked Type 316 stainless steel specimens sectioned from EBR-II duct thimbles. The test results show that the notch sensitivity of irradiated specimens is slightly temperature and neutron fluence dependent and that the material is notch weakened at 600°C. A transition was observed from notch strengthening at low fluences to notch weakening for specimens irradiated to fluences greater than 4 × 1022 n/cm2 (E >0.1 MeV). In addition, the results of the notch tensile tests were used to estimate the ductile fracture toughness of 20 percent cold worked Type 316 stainless steel duct irradiated to a fluence of 7.8 × 1022 n/cm2 (E >0.1 MeV). The influence of irradiation temperature on the strength and ductility of notched specimens is also discussed.
irradiation, stainless steel, notch effect, tensile strength, ductility, fracture toughness, J-integral
Senior Scientist, Westinghouse Handford Company, Richland, WA
Senior Engineer, Westinghouse Hanford Company, Richland, WA