液体金属中の9Cr鋼のキャビテーション壊食に及ぼす液温の影響

概要

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Research on cavitation erosion in liquid metal is very important to confirm the safety of fast breeder reactor and industrial machinery. However, the researches on the cavitation erosion in liquid metal have not been achieved as compared with the study in water. In this study, the effect of temperature on cavitation erosion in liquid metal was clarified. A new cavitation erosion apparatus was developed to carry out erosion test at high temperature in liquid metal, and was confirmed to offer a stable test performance. Test liquid was lead-bismuth alloy and specimen was 9Cr steel and SUS304 steel. The results showed that cavitation erosion rate increases with an increased temperature and reached a peak value at a relative temperature of about 70 degree (the relative temperature was defined as 0° for freezing temperature and 100° for boiling temperature). The erosion rate prediction was discussed for sodium. The erosion rate in sodium was estimated to be located halfway from the rates between lead-bismuth and deionized water.