超声振动对SCN-3%ETH模拟合金定向凝固的影响
收稿日期: 2010-02-25
修回日期: 2010-05-04
网络出版日期: 2010-07-11
基金资助
国家自然科学基金项目50331040和60171034资助
EFFECT OF ULTRASONIC VIBRATION ON THE DIRECTIONAL SOLIDIFICATION OF SCN-3%ETH MODEL ALLOY
Received date: 2010-02-25
Revised date: 2010-05-04
Online published: 2010-07-11
Supported by
Supported by National Natural Science Foundation of China (Nos.50331040 and 60171034)
段萌萌 , 陈长乐 . 超声振动对SCN-3%ETH模拟合金定向凝固的影响[J]. 金属学报, 2010 , 46(7) : 885 -889 . DOI: 10.3724/SP.J.1037.2010.00095
The directional solidification process of SCN-3%ETH model alloy under 27.5 kHz ultrasonic vibration is studied in this paper. The results show that the interface growth is restrained because of the effect of ultrasonic vibration. The radius of curvature on the interface increases as the ultrasonic action time increase. When the ultrasonic vibration is removed from the melt, the refined cellular structure is formed. Because the impact of transient high temperature and pressure generated by the cavitation effect and stirring action of the acoustic streaming and shearing action caused by forced vibration, part of the dendrite tips are fractured. The interface growth rate decreases as the ultrasonic action time increase. Cavitation effects and high-frequency forced vibration caused by ultrasonic vibration in the melt are main reasons for interface growth rate change.
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