液体金属中のキャビテーション壊食に及ぼす液体金属種及び試験材料の影響

概要

論文の詳細を見る
Cavitation erosion tests using a vibratory apparatus were carried out to study the effects of liquid metal composition and test material of different stainless steels and a high chromium steel. The relative temperature was defined as the percentage between freezing and boiling points. At a relative temperature of 14 °C, the erosion rate is 10 to 12 times larger in various lead-bismuth alloys and 2 to 5 times larger in sodium than in deionized water. When SUS304 was exposed to cavitation in PbBi, the surface was work-hardened 20% harder compared with original surface. In deionized water, SUS304 was work-hardened by 5%. Therefore, we can conclude that higher collapse pressure can be estimated to act on the specimen surface in lead-bismuth, as compared with that in water. The erosion rate of stainless steels depends on hardness and Hirayamas Ni equivalent. Erosion resistance is the highest for SUS304 and decreases in the order, 9Cr-1Mo steel, SUS403.