21003 疲労き裂進展に及ぼす液体金属の影響(原子力と材料・構造・組織(1),OS.4 原子力と材料・構造・組織)

概要

論文の詳細を見る
Liquid Metal Embrittlement (LME) decreases the ductility of the solid metal in contact with the liquid metal. Liquid metals are expected to use the nuclear materials such as the coolant of the nuclear reactor (lead-bithmuth) and the spallation target for the neutron source (mercury). However, liquid metal has possibility to degrade the structural integrity and its lifetime due to the LME. In this study, the LME in the combination of an austenitic stainless steel and mercury as a target and a vessel for the spallation neutron source was investigated through the fatigue test with notched specimens in mercury. An opening distance of the notch was measured and the crack growth rate was estimated by the FRActure Surface Topography Analysis (FRASTA). The result showed that the low cycle fatigue strength in mercury was slightly decreased as compared with that in air. Estimated crack growth rate in mercury was higher than that in air.
社団法人日本機械学会の論文
2009-03-05