Abstract
Void swelling and microstructural change during irradiation were investigated for Type 316 stainless steels different in the fabrication process and/or the phosphorus content. The relation between Ni content and swelling was also examined. The irradiations were performed in the Japan Experimental Fast Reactor JOYO, the French fast reactor Phenix, etc.The irradiated specimens were examined by a scanning transmission electron microscope equipped with an energy dispersive X-ray analyser. Results obtaind are summarized as follows.(1) Phosphorus in the steel was found to be effective as a swelling inhibitor.(2) Cold work reduced the swelling of the steel.(3) The segregation of Ni to grainboundaries, precipitates and surroundings of voids decreased the Ni content in the austenite matrix.(4) With increaseing swelling, the initial Ni content of 13% decreased to approximately 9%Ni in the austenite matrix.
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