キャビテーション壊食とスラリー摩耗の複合損傷に及ぼす材料特性の影響

抄録

The simultaneous damages for Stellite, SCMnH 11, TiNi shape memory alloy, and SUS 304 were studied by using a test apparatus with a combination of an ultrasonic vibratory cavitation device and a slurry jet device. The tests were carried out in slurry having a concentration of 3 mass.% at flow velocities from 5 m/s to 13 m/s. The slurry was made of tap water and silica sand. For SUS 304, the volume loss rate of the simultaneous damage is higher than that of slurry wear without cavitation. On the other hand, the volume loss rate of the simultaneous damage is lower for stellite and SCMnH 11, which is work hardened by the cavitation bubble collapse pressure, thus a deceleration phenomenon appears. The simultaneous damage has no effect for TiNi shape memory alloy which shows a phase transformation during cavitation erosion. It was concluded that work hardening by cavitation bubble collapse pressure is responsible for the deceleration phenomenon of simultaneous damage.