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Formation and Growth Kinetics of Reverted Austenite During Tempering of a High Co-Ni Steel

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Abstract

It is well known that high Co-Ni steels exhibit excellent toughness. Since the good toughness in these steels is supposed to be related to thin layers of austenite between martensite crystals, this work presents an experimental study corroborated with diffusional calculations to characterize the evolution of reverted austenite. Atom probe measurements were conducted for analyzing the element distribution in austenite and martensite during tempering. These results were correlated with crystallographic information, which was obtained by using transmission electron microscopy investigations. Additionally, the experimental findings were compared with kinetic calculations with DICTRA™. The investigations reveal that reverted austenite formation during tempering is connected with a redistribution of Ni, Co, Cr, and Mo atoms. The austenite undergoes a Ni and Cr enrichment and a Co depletion, while in the neighboring martensite, a zone of Ni and Cr depletion and Co enrichment is formed. The changes in the chemical composition of austenite during tempering affect the stability of the austenite against phase transformation to martensite during plastic deformation and have thus decisive influence on the toughness of the material.

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Acknowledgments

Financial support for part of the work by the Austrian Federal Government (in particular from Bundesministerium für Verkehr, Innovation und Technologie and Bundesministerium für Wissenschaft, Forschung und Wirtschaft) represented by Österreichische Forschungsförderungsgesellschaft mbH and the Styrian and the Tyrolean Provincial Government, represented by Steirische Wirtschaftsförderungsgesellschaft mbH and Standortagentur Tirol, within the framework of the COMET Funding Programme is gratefully acknowledged. The authors thank also Krystina Spiradek-Hahn for the support regarding TEM investigations.

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Authors and Affiliations

  1. Materials Center Leoben Forschung GmbH, Roseggerstrasse 12, 8700, Leoben, Austria

    Marina Gruber (Scientific Staff), Gerald Ressel (Scientific Staff), Stefan Marsoner (Manager Tooling) & Reinhold Ebner (Company Director)

  2. Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Roseggerstrasse 12, 8700, Leoben, Austria

    Francisca Méndez Martín (Group Leader)

  3. Produkt- und Verfahrensentwicklung für das Segment Sonderwerkstoffe, Böhler Edelstahl GmbH & Co KG, Mariazeller Strasse 25, 8605, Kapfenberg, Austria

    Sarah Ploberger (Researcher/Product Development Special Materials)

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  1. Marina Gruber
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  2. Gerald Ressel
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  3. Francisca Méndez Martín
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  4. Sarah Ploberger
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  5. Stefan Marsoner
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  6. Reinhold Ebner
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Correspondence to Marina Gruber.

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Manuscript submitted May 2, 2016.

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Gruber, M., Ressel, G., Méndez Martín, F. et al. Formation and Growth Kinetics of Reverted Austenite During Tempering of a High Co-Ni Steel. Metall Mater Trans A 47, 5932–5941 (2016). https://doi.org/10.1007/s11661-016-3760-8

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  • DOI: https://doi.org/10.1007/s11661-016-3760-8

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