CAVITATION BEHAVIOR OF A Co-BASE ALLOY

A new kind of Co base alloy was investigated for its cavitation behavior.Cavitation tests were performed using an ultrasonic vibratory apparatus according to ASTM G32/92.At first the phase transformation from γ-austenite to ε-martensite absorbed a great deal of impact energy.After the phase transformation got to the saturated period,impact energy was absorbed by the distortion and fracture of the ε-martensite plates.The two factors contributed to a long incubation period of the specimen.Finally lots of small fragments made by the fracture of the martensite plates were peeled off and at the same time the incubation period of cavitation was over.