Abstract
Type-304 stainless steel, in contact with nuclear fuel, had a duplex surface layer 5 to 10 μm thick. This zone is within the range of, and is believed to be caused by, the recoiling fission fragments from the irradiated urania in which 1.2 to 3 × 10 20 fissions/cm 3 had occurred. Examination of the zone showed that both layers of the duplex structure are austenite of the same crystallographic orientation as the underlying austenitic matrix. Both layers are harder than the underlying matrix. The two layers of the duplex zone are distinguishable only by their etching characteristics. Possible reasons for the existence of a duplex, rather than a single layer, are discussed.
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