Resonant pulsed electromagnetic stirring of melt for effective grain fragmentation

9th International Symposium on Electromagnetic Processing of Materials

材料科学;物理学

Köppen, D.^1,2 ; Baake, E.^1 ; Gerstein, G.^1 ; Mrówka-Nowotnik, G.^3 ; Jarczyk, G.^4

Leibniz University Hannover, Welfengarten 1, Hanover, Germany^1

Kazan State Power Engineering University, Krasnoselskaya Str. 51, Kazan, Russia^2

Rzeszów University of Technology, Powstaców Warszawy 8, Rzeszów, Poland^3

Engineering Consulting, Grosskrotzenburg, Germany^4

关键词: 6082 Aluminium alloys;    Alternating magnetic field;    Crystalloid structure;    Directionally solidified;    Electromagnetic stirring;    Experimental research;    Grain fragmentation;    Solid/liquid interfaces;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/424/1/012036/pdf
DOI  :  10.1088/1757-899X/424/1/012036

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The paper describes the results of an experimental research, demonstrating and explaining the effect of grain fragmentation, caused by pulsed resonant electromagnetic stirring. In the experiments, 6082 aluminium alloy melt was directionally solidified under the influence of continuous (AMF) and pulsed application (PMF) of an alternating magnetic field. The frequency of applied PMF was in accordance to the low-frequency circulation of the melt, causing the resonant increase of a pulsed component of the melt velocity. The structure of electromagnetically stirred specimens was compared to those, solidified without a magnetic field. A strong fragmentation effect (decrease of an average grain size on 51%, comparing with the solidification in natural conditions) for the case of resonant EM stirring was stated. Further, to analyse the influence of the flow, appearing due to the resonant stirring, we observed the formation of solid/liquid interface and a macro-crystalloid structure during solidification of continuously and pulsed stirred melt by applying the novel method of neutron radiography. The results confirmed the strong influence of the pulsed component of velocity on thermal conditions during solidification and, consequently, the metal structure.