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Dendrite growth kinetics of undercooled Iron-based alloy melts

Karrasch, Christian and Volkmann, Thomas and Herlach, Dieter M. (2013) Dendrite growth kinetics of undercooled Iron-based alloy melts. Frühjahrstagung Sektion Kondensierte Materie der DPG, 10. - 15. March 2013, Regensburg. (Unpublished)

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Abstract

Dendritic growth is the major crystal growth mode controlling the evolution of the microstructure during solidification of metallic alloys. In order to verify models for dendritic growth in undercooled melts growth velocities were measured on pure Fe and Fe-based alloy melts. We analyse the effect of solute redistribution on the growth of Fe-B revealing a small partitioning coefficient. Electromagnetic levitation technique is applied to undercool droplets of metallic melt accessible for in-situ diagnostics of the solidification processes. Deep undercoolings of more than 200 K prior to solidification are achieved, which leads to rapid growth of dendrites with velocities of several m/s. The temperature-time profile is measured by a pyrometer while rapid solidification is monitored by a high-speed video camera. The contrast between the liquid and solid phase is visible due to the release of latent heat during recalescence. Experimental results will be presented and discussed in the frame of current model for dendritic growth in undercooled melts. This research work is supported by the German Research Foundation DFG within contract HE1601/18 and ESA within the project CCEMLCC under contract no. 4200020277.

Item URL in elib:https://elib.dlr.de/81739/
Document Type:Conference or Workshop Item (Speech)
Title:Dendrite growth kinetics of undercooled Iron-based alloy melts
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Karrasch, Christianchristian.karrasch (at) dlr.deUNSPECIFIED
Volkmann, Thomasthomas.volkmann (at) dlr.deUNSPECIFIED
Herlach, Dieter M.dieter.herlach (at) dlr.deUNSPECIFIED
Date:14 March 2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:Undercooling of Materials
Event Title:Frühjahrstagung Sektion Kondensierte Materie der DPG
Event Location:Regensburg
Event Type:international Conference
Event Dates:10. - 15. March 2013
Organizer:DPG
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Herlach, Dieter
Deposited On:26 Mar 2013 10:31
Last Modified:26 Mar 2013 10:31

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