功率超声对水平连铸Al-1％Si合金凝固的影响

Effect of High-Intensity Ultrasonic on the Solidification of Al-1%Si Alloy by Horizontally Continuous Cast

研究了水平连铸过程中在保温炉内施加功率超声熔体处理对Al-1％Si合金凝周过程的影响。结果表明:施加功率超声后,合金凝固曲线第1个拐点左移,斜率发生了变化,且随着超声功率的增加,合金的结晶温度升高,当超声功率为1000 W时,结晶温度提高了33℃;同时,施加了功率超声后,保温炉内金属液温度分布均匀性随着超声功率的增加得到了显著的改善;金相分析表明,当超声功率为1000 W时,铸坯凝固组织得到了细化,同时晶粒尺寸更加均匀;此外,施加功率超声处理后铸坯表面质量得到了提高。

The effect of high intensity ultrasonic melt treatment on the solidification of Al-1%Si alloy by horizontally continuous casting was investigated in this paper. Experimental results indicate that with the application of high-intensity ultrasonic melt treatment, the first inflexion of cooling curve moves left, and the slope changes. Meanwhile, the solidification point increased with the increase of ultrasonic power, to be 33 ℃ for the ultrasonic power of 1000 W. Moreover, the uniformity of melt temperature in the furnace is obviously improved with the increase of ultrasonic power. When the ultrasonic power is 1000 W, the solidification microstructure is evidently refined and homogeneous. At the same time, the surface roughness of cast ingots decreases from 40μm to 15 μm.