摘要
研究了超声波对凝固过程的影响,探讨了不同超声功率对纯铝凝固过程冷却温度变化,声流和空化对细化晶粒的作用,实验结果表明:在不同超声功率下处理的铸锭,凝固时间缩短,温度分布更加均匀,温度梯度场变小,在不同功率超声振动下凝固组织平均晶粒尺寸从500μm变成为90μm,但随着超声功率的增加细化程度不再明显.超声的衰减作用使铸锭不同位置的晶核细化程度有很大的不同,由于空化效应和声流搅拌双重作用效应,使凝固组织细化程度提高.
Ultrasonic treatment on pure aluminum solidification process was studied.The cooling temperature curves and cavitation and acoustic stream refined by ultrasonic was discussed.Experimental results showed that solidification structures of casting ingot treated by ultrasonic are refined significantly.The solidification process time becomes shorter and temperature gradient field smaller,Average grain size was 90～500 μm,With the increasing of ultrasonic power ,more refined structure can be obtained.However,when ...
出处
《郑州大学学报（工学版）》
CAS
北大核心
2009年第4期93-97,共5页
Journal of Zhengzhou University（Engineering Science）
基金
国家"863"科技计划项目(2008AA03Z103)
关键词
功率超声
温度曲线
凝固组织
空化
声流
power ultrasonic
temperature curve
solidification structure
cavitation
acoustic stream
