Resonant pulsed electromagnetic stirring of melt for effective grain fragmentation

verfasst von: D. Köppen, E. Baake, G. Gerstein, G. Mrówka-Nowotnik, G. Jarczyk
Abstract: 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.
Organisationseinheit(en): Institut für Elektroprozesstechnik
Institut für Werkstoffkunde
Externe Organisation(en): Kazan State Power Engineering University
Rzeszow University of Technology
Engineering Consulting
Typ: Aufsatz in Konferenzband
Band: 424
Publikationsdatum: 13.10.2018
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Werkstoffwissenschaften (insg.), Ingenieurwesen (insg.)
Elektronische Version(en): https://doi.org/10.1088/1757-899X/424/1/012036 (Zugang: Offen)

BibTeX

@inproceedings{e7e6d5e474c44f2494668fc4e8d84417,
title = "Resonant pulsed electromagnetic stirring of melt for effective grain fragmentation",
abstract = "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.",
keywords = "electromagnetic stirring, grain fragmentation, neutron radiography, process imaging, solidification",
author = "D. K{\"o}ppen and E. Baake and G. Gerstein and G. Mr{\'o}wka-Nowotnik and G. Jarczyk",
note = "Funding information: This work was partially supported by the Ministry of education and science of Russian Federation (Russian President Grant). Authors are grateful to the Helmholtz-Alliance LIMTECH (Liquid Metal Technology) for financial support of the experiments in PSI and to the colleagues from Paul Scherrer Institute for their help during experiments.; 9th International Symposium on Electromagnetic Processing of Materials, EPM 2018 ; Conference date: 14-10-2018 Through 18-10-2018",
year = "2018",
month = oct,
day = "13",
doi = "10.1088/1757-899X/424/1/012036",
language = "English",
volume = "424",
series = "IOP Conference Series: Materials Science and Engineering",
publisher = "IOP Publishing Ltd.",
booktitle = "9th International Symposium on Electromagnetic Processing of Materials (EPM2018)14–18 October 2018, Hyogo, Japan",
address = "United Kingdom (UK)",
}