Microstructural refinement of DC cast AZ80 Mg billets by low frequency electromagnetic vibration
Microstructural refinement of DC cast AZ80 Mg billets by low frequency electromagnetic vibration
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DOI：
10.1016/j.msea.2005.05.070
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发表时间：
2005-09-15
期刊：
影响因子：
6.4
通讯作者：
Cui, HZ
中科院分区：
文献类型：
--
作者：
Guo, SJ;Le, QC;Cui, HZ
研究了在AZ80毫克钢坯的直流铸造过程中施加的可变和固定磁场的影响。在不存在和存在电磁振动力场的情况下，进行了实验，这是由可变和固定磁场的相互作用引起的。变量和固定磁场从0到20,000 a扭转，并在0-30 Hz的范围内调整可变磁场的频率。已经确定电磁振动可完善AZ80钢坯中的晶粒。可变和固定磁场的强度增加导致进一步的晶粒细化。细晶粒的形成是由熔体中晶体核数量和分离的树突状臂的增加产生的。当可变磁场的频率为30 Hz时，坯料中的微观结构被大大完善。 （c）2005 Elsevier B.V.保留所有权利。
The effects of variable and stationary magnetic fields applied during DC casting of AZ80 Mg billets were investigated. The experiments were performed both in the absence and in the presence of electromagnetic vibrating force fields, which were induced by the interaction of variable and stationary magnetic fields. The variable and stationary magnetic fields were modulated from 0 to 20,000 A-turns, and the frequency of the variable magnetic field was adjusted in the range of 0-30 Hz. It has been established that electromagnetic vibrations refine the grains in AZ80 billets. Increasing intensities of variable and stationary magnetic fields lead to further grain refinements. The formation of fine crystal grains resulted from the increase in the number of crystal nuclei and the detached dendritic arms in the melt. When the frequency of the variable magnetic field was 30 Hz, microstructures in the billet were greatly refined. (c) 2005 Elsevier B.V. All rights reserved.