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The results of a series of pressurized tube creep experiments, conducted in Experimental Breeder Reactor II (EBR-II), were evaluated to determine the effect of a temperature change on the in-reactor creep of AISI Type 316 stainless steel. In contrast to prior breeder reactor experiments where a temperature change was imposed and only a short interval of additional fluence accumulated prior to examination, this experiment examines the long-term effects of a temperature change. Data are reported from three separate experiments in which the temperature history was altered by a linear reduction with fluence, a step increase and a step decrease. Analysis of the data indicated that the long-term creep rate adjusts to the new temperature. However, evidence of swelling and stress-affected swelling resulting from the temperature change were found.
radiation, creep, stainless steels, temperature effects, mechanical properties
Alumni associate professor, chairman, Materials Engineering, Auburn University, Auburn, AL
Senior research scientist, Pacific Northwest Labs, Richland, WA