双超声探头处理对7116铝合金DC铸造大铸锭凝固组织的影响

Effect of Dual Ultrasonic Probe Treatment on Solidification Structure for Large 7116 Aluminum Ingot in DC Casting

对7116铝合金进行了双超声处理,对比研究了不同部位的凝固组织,并分析了超声细化的机理。结果表明,铸锭整体细化效果明显,凝固组织比较分散、细小,不同部位的凝固组织均比单一超声细化效果更优。与未经超声处理的铸锭组织相比,铸锭边缘、1/4直径处和心部的晶粒尺寸分别下降了63.4%.76.3%和55.5%。

Double ultrasonic treatment of 7116 aluminum alloy was carried out. The solidification microstructure of different parts was compared and the mechanism of ultrasonic refining was analyzed. The results show that the overall refining effect of the ingot is obvious,the solidification microstructure is more dispersed and fine,and the solidification microstructure of different parts is better than that of single ultrasonic refining. Compared with the ingot without ultrasonic treatment,the grain size at the edge,1/4 diameter and center of the ingot decrease by 63. 4%,76. 3% and 55. 5%,respectively.