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Type 347 stainless steel was found to undergo extreme embrittlement above 550 C after irradiation to a fast fluence of 2.1 × 1022 n/cm2. This embrittlement could not be removed by annealing at 980 C, although the anneal restored the preirradiation tensile properties at temperatures up to 500 C. The long-time irradiation was found to cause significant increases in copper, vanadium, and zinc contents while the manganese content was decreased. It is suggested that segregation of these solid transmutation products to the grain boundaries may prevent grain boundary migration during tension testing at elevated temperatures. Prevention of grain boundary migration during testing may enhance the ductility minimum present in most alloys at intermediate testing temperatures.
stainless steel, irradiation effects, tensile properties, stress rupture properties, embrittlement, transmutations, chemical analysis, fractography, metallography, postirradiation annealing
Research Metallurgist, Battelle Memorial Inst., Columbus, Ohio
Perrin, J. S.
Associate Chief, Battelle Memorial Inst., Columbus, Ohio
Wullaert, R. A.
Chief, Battelle Memorial Inst., Columbus, Ohio