抄録
Micro-pipe will be used to inject microbubbles into flowing mercury in high power pulsed spallation neutron source. The effect of mercury immersion on the fatigue strength of 316-type stainless steel had been recognized using micro-size specimens. The mercury immersion attach is enhanced on the surface layer contact with mercury. In fact, the hardness of the surface layer was increased by the mercury immersion. Because the micro-pipe will be suffered with the flow induced vibration under flowing mercury and the immersion effect might be enhanced in micro-size range, it is indispensable to evaluate the effects of mercury and size on the fatigue. In the paper, we will show the preliminary results on the tensile fatigue strength of the micro-pipe with mercury immersion and discuss the size effects on the fatigue strength.
