超声波共振度对铸锭内气孔生成的影响  

Effect of Ultrasonic Resonance Degree on the Formation of Porosity in Aluminum Ingot

作　　者：李军文[1] 由向群[1] 付莹[1] 桃野正[2] 田汤善章[2] 

机构地区：[1]辽宁工业大学材料与化学工程学院,辽宁锦州121001 [2]国立室兰工业大学材料物性工学科

出　　处：《铸造技术》2008年第6期790-792,共3页Foundry Technology

基　　金：教育部留学回国人员科研启动基金资助项目批准文号[2007]527号;辽宁工业大学材料物理与化学重点学科研究基金资助2007LG005

摘　　要：为了弄清超声波对金属熔体除气的影响,研究了超声波共振度对Al-1.0%Cu、Al-1.0%Si及Al-1.0%Zn合金铸锭内气孔生成的影响,同时也考察了超声波共振度对铝合金铸锭细化的影响,分析了超声波共振度对铸锭内气孔生成的影响原因。结果表明,超声波处于共振状态下的铸锭密度值和细化效果均远大于非共振状态下的铸锭密度值和细化效果;超声处理过程中,声空化气泡的"表面效应"和"层效应"起着决定作用;超声波的细化作用来自于声空化气泡的膨胀和收缩期间而形成的高温、高压的反应场,因而刺激熔体内的动态形核。In order to elucidate the effect of ultrasonic on degassing in molten metal, the effect of ultrasonic resonance degree on the formation of porosity and grain refinement in Al-1.0% Cu, Al-1. 0%Si and Al-1.0%Zn alloy ingots was investigated, and the mechanism of influence of ultrasonic resonance degree on the formation of porosity in the ingot was analyzed. The results show that both of the density and grain refinement efficiency of the ingot in the resonance condition are much larger than the ingot in non-resonance condition. At the same time, the ＂area＂ effect and ＂shell＂ effect of cavitation bubble play decisive effects. The grain refinement is due to the high temperature, highpressure reacting field creating during the period of expansion and shrinkage of cavitation bubbles, thus promotes the dynamic nucleation in melt.

关 键 词：超声波 共振 铸锭 气孔 晶粒细化 

分 类 号：TG27[金属学及工艺—铸造]