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Dynaphase: Online Calculation of Thermodynamic Properties during Continuous Casting

Dynaphase: Online Berechnung thermodynamischer Materialdaten während des Stranggießens

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Abstract

The Siemens VAI software model DynaPhase calculates thermodynamic properties depending on the chemical analysis of steel. It can be used online together with Siemens VAI’s secondary cooling model Dynacs 3D, which is a unique feature. Offline it can be used to investigate the thermodynamic properties of steel grades and therefore supports the development of new grades. The core of DynaPhase is a substitutional solution model for the Gibbs free energy for calculating multi-component phase diagrams. The parameters of this model are determined by employing the CALPHAD approach. This model is combined with a microsegregation model to account for the interdendritic solidification process. New differential scanning calometry measurements of the Department of Metallurgy at the Mining University of Leoben have been used to extend the DynaPhase database for high Al or Si concentrations. This paper shows how important correct thermodynamic properties calculations with DynaPhase are, for controlling the secondary cooling system in continuous casting.

Zusammenfassung

DynaPhase ist ein VAI Software Modell zur Berechnung von thermodynamischen Eigenschaften in Abhängigkeit von der chemischen Analyse der Stahlgüte. Es kann zusammen mit dem VAI Sekundärkühlungsmodell Dynacs 3D online eingesetzt werden, was ein Alleinstellungsmerkmal darstellt. Offline kann es zum Untersuchen der thermodynamischen Eigenschaften beliebiger Stahlzusammensetzungen herangezogen werden und unterstützt somit die Entwicklung neuer Stahlgüten. Das Kernstück von DynaPhase ist ein „substitutional solution“ Modell zur Beschreibung der freien Gibbs Energien der verschiedenen Multikomponenten-Phasen. Die Parameter dieses Modells werden mit Hilfe des CALPHAD Ansatzes bestimmt. Dieses Modell ist mit einem Mikroseigerungsmodell gekoppelt, um die interdentritische Erstarrung des Stahls zu beschreiben. Neue differential scanning calometry Messungen des Instituts für Metallurgie der Montanuniversität in Leoben wurden genutzt, um die Datenbank von DynaPhase für Stahlgüten mit hohem Silizium oder Aluminium Gehalt zu erweitern. Im vorliegenden Beitrag soll anhand eines Beispiels gezeigt werden, wie wichtig die korrekte Berechnung der thermodynamischen Eigenschaften mit DynaPhase für die Kontrolle der Sekundärkühlung im Strangguss ist.

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Acknowledgements

Financial support by the Austrian Federal Government (in particular by the Bundesministerium für Verkehr, Innovation and Technologie, and the Bundesministerium für Wirtschaft, Familie und Jugend) represented by Österreichische Forschungsförderungsgesellschaft mbH and the Styrian and the Tyrolean Provincial Governments, represented by Steirische Wirtschaftsförderungsgesellschaft mbH and Standortagentur Tirol, within the framework of the COMET Funding Program is gratefully acknowledged.

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  1. Siemens VAI Metals Technologies GmbH, Turmstr. 44, 4031, Linz, Austria

    Susanne Hahn & Thomas Schaden

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  1. Susanne Hahn
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  2. Thomas Schaden
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Correspondence to Susanne Hahn.

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Hahn, S., Schaden, T. Dynaphase: Online Calculation of Thermodynamic Properties during Continuous Casting. Berg Huettenmaenn Monatsh 159, 438–446 (2014). https://doi.org/10.1007/s00501-014-0305-6

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