功率超声对纯铝凝固过程的影响及衰减特性分析-《郑州大学学报(工学版)》

文章信息/Info

Title:: Effect of Ultrasonic Treatment on Solidification Characteristic andAnalysis the Ultrasonic Attenuation Mechanism

作者:: 胡仕成; 杨运猛; 胡永清; 等.; 中南大学现代复杂装备设计与极端制造教育部重点实验室,湖南长沙,410083, 中南大学现代复杂装备设计与极端制造教育部重点实验室,湖南长沙,410083, 中南大学现代复杂装备设计与极端制造教育部重点实验室,湖南长沙,410083, 中南大学现代复杂装备设计与极端制造教育部重点实验室,湖南长沙,410083

Author(s):: HU Shicheng; YANG Yunmeng; HU Yongqing; etc; Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing，Ministry of Education；Central South Uni—versity，Changsha 410083，China

Keywords:: power ultrasonic; temperature curve; solidification structure; cavitation; acoustic stream

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500 μm变成为90 μm,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.

Abstract:: Ultrasonic treatment on pure aluminum solidification process was studied．The cooling temperaturecurves and cavitation and acoustic stream refined by ultrasonic was discussed．Experimental results showedthat solidification structures of casting ingot treated by ultrasonic are refined significantly．The solidificationprocess time becomes shorter and temperature gradient field smaller，Average grain size was 90～500“m，With the increasing of ultrasonic power，more refined structure call be obtained．However，when the ultrasonicpower reaches a certain value and different positions of the the casting ingot，the effect of refining grains doesnot increase significantly．Cavitation effect can effectively function and solidification structure can be refinedbetter aided by agitating effect of acoustic stream．