高功率超声外场下7050合金中的显微疏松.pdfVIP

学兔兔 铸 造 Feb．2011 · 136· FOUNDRY VOI．60 NO．2 高功率超声外场下7050合金中的显微疏松 张 明，李晓谦，黎正华，许显华 (中南大学机电工程学院，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) 摘要：通过对超声波发生器的优化，研究了高功率超声波对705o铝合金铸锭中显微疏松形成的影响。试验结果表明， 高功率超声处理的铸锭的组织更加致密，声流效应更加显著。在试验所用超声功率范围内，超声功率为2 600W时除气 效率最高，抑制显微疏松形成的效果最佳，铸锭中横截面处显微疏松百分比减少了30．4％～56．3％，中心显微疏松的百 分比也减4、了31．1％~53-3％，这表明高功率超声振动能极大降低显微疏松的形成。 关键词：铸造7050合金；显微疏松；高功率超声；声流；除气；补缩 中图分类号：TB559；TG249．9 文献标识码：A 文章编号：1001—4977(201 1)02—0136—04 Micro—Porosity in 7050 Alloy Ingot Under High Power UItrasonic Field ZHANG Ming，LI Xiao—qian，LI Zheng—hua，XU Xian-hua (Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing Ministry of Education，School of Mechanical and Electrical Engineering， Central South University，Changsha 41 0083，Hunan，China) Abstract：The ultrasonic generator was used to treat the 7050 aluminum alloy melt SO as to study the effect of ultrasonic on micro-porosity of 7075 aIuminum alloy ingot．The experimental results show that the high power ultrasound apparently jncreased the structure compactness of the ingot．1n addition。the Iarge-scale acoustic streaming effect was more significant．The highest degassing ability and the optimal micro—porosity restraining result were obtained when the vibrating power iS 2 600 W．The cross-sectionaI micro．porosity percentage was reduced by 30．4％．56．3％ and the centraI micro—porosity percentage was also reduced by 31．1％ ．53．3％ ．High power ultras