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Quantitative Characterization of a Belt-cast High-Manganese Steel Microstructure

Quantitative Charakterisierung des Gussgefüges bandgegossenen hochmanganhaltigen Stahls
  • S. Preißler

    born 1967; Studied Material Sciences at TU Bergakademie Freiberg, graduated with Dipl.-Ing. Since 1999 she is working at Salzgitter Mannesmann Forschung GmbH and is currently head of the group for Metallography and Physical Metallurgy.

    , M. Witte

    born 1981; Studied Physics at TU Braunschweig and received his PhD at the chair of Physical Metallurgy at RWTH Aachen University. Since 2013 he works as expert for Physical Metallurgy at Salzgitter Mannesmann Forschung GmbH with a focus on X-ray diffraction, electron microscopy and image analysis.

    and T. Evertz
From the journal Practical Metallography

Abstract

The description of the solidification process in casting processes with varying product thickness is characterized based on solidification structures, segregations as well as the primary and secondary microstructure. In near-net-shape casting processes, it is particularly challenging to achieve microstructure homogeneity in the as-cast condition, since the degree of forming in production processes up to hot or cold strip is lower than in the production of slabs or thin slabs.

The density of shrinkage porosity in belt-cast high-manganese steel (HMnS) will be determined quantitatively using polished microsections. Following the visualization of the primary cast structure, light microscopic images will be obtained using different tint etches. For the evaluation of secondary dendrite arm spacing (SDAS), internally developed software based on ImageJ and Matlab will be used.

Kurzfassung

Die Beschreibung des Erstarrungsverlaufs wird für Gießverfahren mit unterschiedlicher Produktdicke anhand der Erstarrungsstrukturen, Seigerungen sowie des Primärund Sekundärgefüges charakterisiert. Für endabmessungsnahe Gießverfahren stellt die Gefügehomogenität bereits im Gusszustand eine besondere Herausforderung dar, da der Umformgrad bis zum Warm- oder Kaltband im Vergleich zur Erzeugung aus Brammen oder Dünnbrammen geringer ausfällt.

Die Lunkerdichte von bandgegossenen Bändern aus hochmanganhaltigem Stahl (HMnS) wird an polierten Schliffen quantitativ bestimmt. Basierend auf der Entwicklung des primären Gussgefüges werden lichtmikroskopische Aufnahmen unter Verwendung verschiedener Farbätzverfahren erstellt. Für die Auswertung von Sekundärdendritenarmabständen (SDAS) wird eine eigenentwickelte Software auf Basis von ImageJ und Matlab eingesetzt.

About the authors

S. Preißler

born 1967; Studied Material Sciences at TU Bergakademie Freiberg, graduated with Dipl.-Ing. Since 1999 she is working at Salzgitter Mannesmann Forschung GmbH and is currently head of the group for Metallography and Physical Metallurgy.

M. Witte

born 1981; Studied Physics at TU Braunschweig and received his PhD at the chair of Physical Metallurgy at RWTH Aachen University. Since 2013 he works as expert for Physical Metallurgy at Salzgitter Mannesmann Forschung GmbH with a focus on X-ray diffraction, electron microscopy and image analysis.

References / Literatur

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Received: 2021-07-14
Accepted: 2021-08-04
Published Online: 2021-12-30

© 2021 Walter de Gruyter GmbH, Berlin/Boston, Germany

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