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Metastable phase formation in undercooled Fe-Cr-Ni alloy melts

Volkmann, Thomas and Löser, Wolfgang and Herlach, Dieter (2010) Metastable phase formation in undercooled Fe-Cr-Ni alloy melts. Frühjahrstagung, Sektion Kondensierte Materie, DPG, 22.-26. März 2010, Regensburg.

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Abstract

The solidification behaviour of undercooled Fe69Cr31-xNix melts, which represents the basis for the technically important stainless steels, was investigated in a wide composition range (7 at.% < x < 22 at.%) with respect to the competitive formation of ferrite (bcc) and austenite (fcc). The electromagnetic levitation technique was used for undercooling of bulk samples. The primary solidifying phase was identified by the analysis of time-resolved recalescence profiles that were detected by a fast responding photo diode at a rate of 1 MHz. Under equilibrium conditions the solidification mode changes from ferrite to austenite if the atomic fraction ratio of Ni/Cr = 0.5 is exceeded. It is shown that crystallization of bcc phase is preferred even at compositions where bcc is metastable. With rising undercooling a transition from primary fcc to primary bcc solidification occurs at a critical undercooling. The experimental results are compared to the predictions of the classical nucleation theory and an improved theory taking into account a finite thickness of the interface between the nucleus and the undercooled melt. The financial support from the Deutsche Forschungsgemeinschaft under contract no. He 1601/3 is gratefully acknowledged.

Document Type:Conference or Workshop Item (Speech)
Title:Metastable phase formation in undercooled Fe-Cr-Ni alloy melts
Authors:
AuthorsInstitution or Email of Authors
Volkmann, Thomasthomas.volkmann@dlr.de
Löser, WolfgangIFW Dresden
Herlach, Dieterdieter.herlach@dlr.de
Date:23 March 2010
Refereed publication:Yes
In ISI Web of Science:No
Series Name:DPG Verhandlungen SKM 2010
Status:Published
Keywords:Undercooling, Non-equilibrium Solidification, Steel Alloys
Event Title:Frühjahrstagung, Sektion Kondensierte Materie, DPG
Event Location:Regensburg
Event Type:international Conference
Event Dates:22.-26. März 2010
Organizer:Deutsche Physikalische Gesellschaft
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Dieter Herlach
Deposited On:30 Mar 2010 15:03
Last Modified:30 Mar 2010 15:03

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