Dong Fang, Li Xiaoqian, Zhang Lihua, Ma Liyong, Li Ruiqing
School of Mechanical and Electrical Engineering, Central South University, 410083 Changsha, China; National Key Laboratory of High Performance Complex Manufacturing, Central South University, 410083 Changsha, China.
School of Mechanical and Electrical Engineering, Central South University, 410083 Changsha, China; National Key Laboratory of High Performance Complex Manufacturing, Central South University, 410083 Changsha, China.
Ultrason Sonochem. 2016 Jul;31:150-6. doi: 10.1016/j.ultsonch.2015.12.009. Epub 2015 Dec 11.
Ultrasound radiation rods play a key role in introducing ultrasonic to the grain refinement of large-size cast aluminum ingots (with diameter over 800 mm), but the severe cavitation corrosion of radiation rods limit the wide application of ultrasonic in the metallurgy field. In this paper, the cavitation erosion of Ti alloy radiation rod (TARR) in the semi-continuous direct-chill casting of 7050 Al alloy was investigated using a 20 kHz ultrasonic vibrator. The macro/micro characterization of Ti alloy was performed using an optical digital microscopy and a scanning electron microscopy, respectively. The results indicated that the cavitation erosion and the chemical reaction play different roles throughout different corrosion periods. Meanwhile, the relationship between mass-loss and time during cavitation erosion was measured and analyzed. According to the rate of mass-loss to time, the whole cavitation erosion process was divided into four individual periods and the mechanism in each period was studied accordingly.
超声辐射棒在将超声波引入大尺寸铸铝锭（直径超过800毫米）的晶粒细化过程中起着关键作用，但辐射棒严重的空化腐蚀限制了超声波在冶金领域的广泛应用。本文采用20kHz超声振动器研究了Ti合金辐射棒（TARR）在7050铝合金半连续直接水冷铸造过程中的空蚀情况。分别使用光学数码显微镜和扫描电子显微镜对Ti合金进行宏观/微观表征。结果表明，在不同的腐蚀阶段，空蚀和化学反应发挥着不同的作用。同时，测量并分析了空蚀过程中质量损失与时间的关系。根据质量损失率与时间的关系，将整个空蚀过程分为四个阶段，并据此研究了每个阶段的腐蚀机理。
