University of Oulu

Kaijalainen A., Somani M., Hemmilä M., Liimatainen T., Porter D.A., Kömi J. (2018) Influence of Manganese Content and Finish Rolling Temperature on the Martensitic Transformation of Ultrahigh-Strength Strip Steels. In: Stebner A., Olson G. (eds) Proceedings of the International Conference on Martensitic Transformations: Chicago. The Minerals, Metals & Materials Series. Springer, Cham

Influence of manganese content and finish rolling temperature on the martensitic transformation of ultrahigh-strength strip steels

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Author: Kaijalainen, Antti1; Somani, Mahesh1; Hemmilä, Mikko2;
Organizations: 1Materials and Production Engineering, University of Oulu, Finland
2SSAB Europe Oy, Raahe, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe201804196733
Language: English
Published: Springer Nature, 2018
Publish Date: 2019-04-12
Description:

Abstract

The effects of manganese content and finish rolling temperature (FRT) on the transformed microstructures and properties of two low-alloyed thermomechanically rolled and direct-quenched (TM-DQ) steels were investigated. The materials were characterized in respect of microstructures and tensile properties. In addition, microhardness measurements were made both at the surface and centerline of the hot-rolled strips to help characterize the phase constituents. Detailed microstructural features were further revealed by laser scanning confocal microscopy (LSCM) and field emission scanning electron microscopy combined with electron backscatter diffraction (FESEM-EBSD). It was apparent that a decrease in the temperature of controlled rolling, i.e., the finish rolling temperature (FRT), resulted in reduced martensite fractions at the surface, as a consequence of strain-induced fine ferrite formation. The centerline of the strip, however, comprised essentially martensite and upper bainite. In contrast, high FRT and higher manganese content resulted in essentially a fully martensitic microstructure due to enhanced hardenability. The paper presents a detailed account of the hot rolling and hardenability aspects of TM-DQ ultra-high-strength strip steels and corresponding microstructures and properties.

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Series: The minerals, metals & materials series
ISSN: 2367-1181
ISSN-E: 2367-1696
ISSN-L: 2367-1181
ISBN: 978-3-319-76968-4
ISBN Print: 978-3-319-76967-7
Pages: 149 - 154
DOI: 10.1007/978-3-319-76968-4_23
OADOI: https://oadoi.org/10.1007/978-3-319-76968-4_23
Host publication: Proceedings of the International Conference on Martensitic Transformations
Host publication editor: Stebner, A.
Olson, G.
Conference: International Conference on Martensitic Transformations
Type of Publication: A4 Article in conference proceedings
Field of Science: 216 Materials engineering
Subjects:
Funding: The financial support of the Finnish Funding Agency for Technology and Innovation (Tekes) is gratefully acknowledged.
Copyright information: © The Minerals, Metals & Materials Society 2018. This is a prepublication version of an article published in Proceedings of the International Conference on Martensitic Transformations: Chicago. The final published version is available online at: https://doi.org/10.1007/978-3-319-76968-4_23.