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Identification of Defect Prone Peritectic Steel Grades by Analyzing High-Temperature Phase Transformations

  • Symposium: Defects and Properties of Cast Metals
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Abstract

Continuous casting of peritectic steels is often difficult and critical; bad surface quality, cracks, and even breakouts may occur. The initial solidification of peritectic steels within the mold leads to formation of surface depressions and uneven shell growth. As commercial steels are always multicomponent alloys, the influence also of the alloying elements besides carbon on the peritectic phase transition needs to be taken into account. Information on the solidification sequence and phase diagrams for initial solidification are lacking especially for new steel grades, like high-alloyed TRIP-steels with high Mn, Si, and particularly high Al contents. Based on a comprehensive method development, the current study shows that differential scanning calorimeter measurements allow a clear prediction if an alloy is peritectic (i.e., critical to cast). In order to confirm these results, thermo-optical analyses with a high-temperature laser-scanning-confocal-microscope are performed to observe the phase transformations in situ up to the melting point.

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Acknowledgments

Financial supports by the Austrian Federal Government (in particular from the Bundesministerium für Verkehr, Innovation und Technologie and the Bundesministerium für Wirtschaft und Arbeit) and the Styrian Provincial Government, represented by Österreichische Forschungsförderungsgesellschaft mbH and by Steirische Wirtschaftsförderungsgesellschaft mbH, within the research activities of the K2 Competence Centre on “Integrated Research in Materials, Processing and Product Engineering,” operated by the Materials Center Leoben Forschung GmbH within the framework of the Austrian COMET Competence Centre Programme and the industry partners Siemens VAI Metals Technologies GmbH and voestalpine Stahl GmbH are gratefully acknowledged.

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Authors and Affiliations

  1. Montanuniversitaet Leoben, Franz-Josef-Straße 18, 8700, Leoben, Austria

    Peter Presoly (Research Associate), Robert Pierer (Research Associate) & Christian Bernhard (Associate Professor, Key Researcher and Head of the Workgroup “Continuous casting: Metallurgy and Materials”)

  2. INTECO Special Melting Technologies GmbH, Wiener Strasse 25, 8600, Bruck an der Mur, Austria

    Robert Pierer (Research Associate)

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  1. Peter Presoly
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  2. Robert Pierer
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  3. Christian Bernhard
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Correspondence to Peter Presoly.

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Manuscript submitted August 28, 2012.

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Presoly, P., Pierer, R. & Bernhard, C. Identification of Defect Prone Peritectic Steel Grades by Analyzing High-Temperature Phase Transformations. Metall Mater Trans A 44, 5377–5388 (2013). https://doi.org/10.1007/s11661-013-1671-5

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  • DOI: https://doi.org/10.1007/s11661-013-1671-5

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