Stirring of melt during solidification process for effective grain fragmentation using pulsed electromagnetic fields

verfasst von: D. Köppen, Egbert Baake, G. Mrówka-Nowotnik
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 experiment, 6082 aluminium alloy melt was directionally solidified under the influence of continuous and pulsed application of an alternating magnetic field (AMF). The frequency of applied pulsed field (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
Externe Organisation(en): Kazan State Power Engineering University
Rzeszow University of Technology
Typ: Artikel
Journal: Ėlektričestvo : ežemesjačnyj teoretičeskij i naučno-praktičeskij žurnal
Band: 2019
Seiten: 66-69
ISSN: 0013-5380
Publikationsdatum: 2019
Publikationsstatus: Veröffentlicht
Elektronische Version(en): https://doi.org/10.24160/0013-5380-2019-6-66-69 (Zugang: Geschlossen)

BibTeX

@article{2f8f32a35f7147bbb830c26ad74d4ce4,
title = "Stirring of melt during solidification process for effective grain fragmentation using pulsed electromagnetic fields",
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 experiment, 6082 aluminium alloy melt was directionally solidified under the influence of continuous and pulsed application of an alternating magnetic field (AMF). The frequency of applied pulsed field (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.",
author = "D. K{\"o}ppen and Egbert Baake and G. Mr{\'o}wka-Nowotnik",
year = "2019",
doi = "10.24160/0013-5380-2019-6-66-69",
language = "English",
volume = "2019",
pages = "66--69",
journal = "Ėlektri{\v c}estvo : e{\v z}emesja{\v c}nyj teoreti{\v c}eskij i nau{\v c}no-prakti{\v c}eskij {\v z}urnal",
issn = "0013-5380",
publisher = "JSC Znack",
number = "6",
}