Influence of electromagnetic parameters on solidification structure of pure AI in the case of identical power  

作　　者：Yong-yong Gong Shu-min Cheng Yu-yi Zhong Xiang Wang Yun-hu Zhang Qi-jie Zhai Hong-gang Zhong Zhi-shuai Xu Rong Yue Ning Pei 

机构地区：[1]College of Science, Shanghai University, Shanghai 200444,China [2]Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai 200444,China [3]School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China [4]Materials Genome Institute, Shanghai University,Shanghai 200444, China

出　　处：《Journal of Iron and Steel Research International》2018年第8期854-861,共8页

基　　金：Acknowledgements The authors acknowledge the financial support from the National Natural Science Foundation of China （Grant Nos. 51504048, 50574056 and U1760204） and the National Key Research Program of China （Grant No. 2017YFB0701800）.

摘　　要：Pulsed magneto-oscillation （PMO） as a new electromagnetic technology to generate the grain refinement in metals and alloys was significantly developed in recent years. The influence of electromagnetic parameters on the grain size reduction in pure AI was investigated under the application of PMO with a constant inputting power. The experimental results show that the grain refinement degree could be improved with the increase in the current intensity in the case of the identical power. Moreover, through analysing the electromagnetic force and resistance force applied on the nucleus, a criterion of the nucleus detached from the mould wall was constructed. Based on the criterion, the detachment of nuclei with finer radius could cause better effect of the grain refinement, when applying a higher current peak. The movement of the detached grains was considered by analysing the influence of electromagnetic force and forced flow.Pulsed magneto-oscillation （PMO） as a new electromagnetic technology to generate the grain refinement in metals and alloys was significantly developed in recent years. The influence of electromagnetic parameters on the grain size reduction in pure AI was investigated under the application of PMO with a constant inputting power. The experimental results show that the grain refinement degree could be improved with the increase in the current intensity in the case of the identical power. Moreover, through analysing the electromagnetic force and resistance force applied on the nucleus, a criterion of the nucleus detached from the mould wall was constructed. Based on the criterion, the detachment of nuclei with finer radius could cause better effect of the grain refinement, when applying a higher current peak. The movement of the detached grains was considered by analysing the influence of electromagnetic force and forced flow.

关 键 词：Grain refinement Pure Al SOLIDIFICATION Pulsed magneto-oscillation Identical power 

分 类 号：TP18[自动化与计算机技术—控制理论与控制工程] TM33[自动化与计算机技术—控制科学与工程]