关键词: 电渣重熔, 超声波功率, 夹杂物, 氧化铝

Abstract: A new electrosalg furnace with ultrasonic vibration was designed, and the effects of ultrasonic power on removal and distribution of alumina inclusions in electroslag remelting (ESR) ingots were studied. The results showed that during ESR, the biggest inclusion size decreased gradually from 40 mm to 36 and 14 mm when the ultrasonic power increased from 0 to 400 and 700 W. But when the power increased to 1000 W, the biggest inclusion size increased to 36 mm instead. Without ultrasonic vibration in ESR process, the inclusions had a tendency to aggregate in the edge and center of ESR ingots, and the edge aggregation was more serious. When the ultrasonic power increased, the distribution of inclusions became more uniform gradually. These phenomena were due to the ultrasonic cavitation and acoustic streaming effects, which improved the dynamic conditions of metal-slag reaction and were conducive to the removal and uniform distribution of inclusions. However, the too high ultrasonic power would generate the strong cavitation and acoustic streaming effects which would reduce the reduction of reaction rate between the slag and liquid metal, cause the disturbance of molten pool and depress the refining capacity of electroslag remelting process.

Key words: electroslag remelting, ultrasonic power, inclusion, alumina