Abstract
Surfaces were studied in type 304 stainless steel fractured after irradiation at 370 deg C to 1.4-10 x 10/sup 22/ n/cm/sup 2/. The irradiated samples failed primarily along grain boundaries, although in some cases areas of ductile transgranular fracture were also present. He release during fracture was monitored with a residual gas annlyzer; its concentration at the boundaries was approximately proportional to the fast neutron fluence to which the samples were irradiated, being about 0.08 helium atoms per grain boundary site at 1 x 10/sup 23/ n/cm/sup 2/. Phosphorus was more concentrated at grain boundaries than on ductile fracture surfaces. Sulfur segregated to surfaces during and after the fracture, suggesting that it could segregate to grain boundaries. Grain boundary fracture surfaces of irradiated samples were depleted in Cr and enriched in Fe and Ni compared with ductile fractures of unirradiated samples broken at the same temperature. (auth)
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