Abstract
Liquid mercury target will be used in Japan Spallation Neutron Source. The moment the proton beams bombard the target, pressure waves will be generated in the mercury by thermally shocked heat deposition. The target vessel will be subjected to the pitting damage and the cyclic stress damage induced by pressure wave propagation. Surface-modification is expected to reduce these damage. In this study, the effects of carburizing and nitriding treatments on the pitting damage and the fatigue strength of surface-modificated materials were investigated. As results, it was confirmed that the double surface treatment with carburizing and nitriding could reduce the pitting damage and improve fatigue strength in high cycle region.
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