超声波探头位置对Al-5.7%Cu铸锭凝固组织的影响
Effect of Ultrasonic Probe Location on Solidification Structure of Al-5.7%Cu Alloy Ingot
摘 要
研究了超声波探头位置变化对Al-5.7%Cu合金铸锭凝固组织的影响,考察了探头水平位置变化对等轴晶占有率的影响,探讨了超声波作用下晶粒细化机理.结果表明：当探头浸入深度相同且位于铸型中心线时,得到的细等轴晶区最大,且呈对称分布;当探头的位置贴近铸型壁时,细等轴晶区向探头端面附近集中并缩减,柱状晶区进一步扩大.超声波的细化效果来自于声空化造成微区瞬时过冷,以及动态形核;而声流造成凝固的枝晶破碎,提供结晶核心.
探头
Al-5.7%Cu合金
凝固
细化
ultrasonic treatment
probe
Al-5.7%Cu alloy
solidification
refinement
Abstract
A series of experiments were conducted with Al-5.7%Cu alloy to investigate the effect of probe horizontal location on solidification structure and grain-refining efficiency of ultrasonic ingots.The mechanism of grain refinement in ultrasonic field was discussed.The equiaxed grain zone is the biggest when the probe position was at the centerline of the mould.The equiaxed grain zone is reduced to the probe end when the probe position was nearby the mould wall.Application of ultrasonic vibration resulted in forming acoustic cavitation,leading to supercooling of micro-area and dynamic nucleation.The acoustic streams make breaking-up of solidifying dendritic crystal and supplied germ nucleus,therefore,the solidification structure of ingots get refined.It is a complex dynamic process.
中图分类号 TQ174.75 TB383
所属栏目
基金项目 辽宁省教育厅科研基金资助项目(2005L186)
收稿日期 2006/12/19
修改稿日期 2007/9/19
网络出版日期
作者单位点击查看
备注李军文(1969-),男,辽宁锦州人,教授,博士.
引用该论文: LI Jun-wen,YOU Xiang-qun,MOMONO Tadashi,TAYU Yoshiaki. Effect of Ultrasonic Probe Location on Solidification Structure of Al-5.7%Cu Alloy Ingot[J]. Materials for mechancial engineering, 2007, 31(12): 30～33
李军文,由向群,桃野正,田汤善章. 超声波探头位置对Al-5.7%Cu铸锭凝固组织的影响[J]. 机械工程材料, 2007, 31(12): 30～33
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参考文献
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【3】Naji Meidani A R,Hasan M.A study of hydrogen bubble growth during ultrasonic degassing of Al-Cu alloy melts[J].J Mater Process Tech,2004,147:311-320.
【4】Xu H,Jian X,Meek T T,et al.Degassing of molten aluminum A356 using ultrasonic vibration[J].Materials Letters,2004,58:3669-3673.
【5】Eskin G I,Sinyavskii V S,Usova V V.Regularities of the intensifying effect of ultrasonic treatment on titanium alloy pickling[J].Protection of Metals,2003,39(6):614-623.
【6】Abdel-Reihim M,Reif W.Effect of ultrasonic vibrations on the solidifications of alloys containing different microstructures[J].Metall,1984,38(2):130-132.
【7】Jian X,Xu H,Meek T T,et al.Effect of power ultrasound on solidification of aluminum A356 alloy[J].Materials Letters,2005,59:190-193.
【8】Abramov O V.Action of high intensity ultrasound on solidifying metal[J].Ultrasonics,1987,25(3):73-82.
【9】Eskin G I.Ultrasonic treatment of light alloy melts[M].Amsterdam:Gordon and Breach Science Publishers,1998.
【10】Li Junwen,Momono T.Effect of ultrasonic output power on refining of crystal structures of ingots and its experimental simulation[J].J Mater Sci Technol,2005,21(1):47-52.
【11】Li Junwen,Momono T.Effect of distribution coefficient K0 on the structure of ultrasonic ingots during solidification of aluminum alloys[J].Mater Technol,2005,20(4):202-207.
【12】Chalmers B.Principles of solidification[M].New York:John Wiley & Sons,1964.
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【14】Li X,Li T,Li X,et al.Study of ultrasonic melt treatment on the quality of horizontal continuously cast Al-1%Si alloy[J].Ultrasonics Sonochemistry,2006,13:121-125.
【15】Eskin G I.超音波工学と応用技術[M].大阪:新日本鋳鍛造協会出版,1991.
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