Title: Deformation behaviour and microstructure development of a high-carbon steel during its hot and cold processing

Authors: I. Schindler, L. Cizek, L.A. Dobrzanski, P. Kozelsky, S. Rusz, T. Kubina, P. Suchanek, M. Marek, J. Boruta, L. Cerny, V. Svinc

Addresses: Faculty of Metallurgy and Materials Engineering, VSB – Technical University of Ostrava, 17 listopadu 15, 70833 Ostrava, Czech Republic. ' Faculty of Metallurgy and Materials Engineering, VSB – Technical University of Ostrava, 17 listopadu 15, 70833 Ostrava, Czech Republic. ' SU Gliwice, Mechanical Faculty, Konarskiego 18a, 44–100 Gliwice, Poland. ' Faculty of Metallurgy and Materials Engineering, VSB – Technical University of Ostrava, 17 listopadu 15, 70833 Ostrava, Czech Republic. ' Faculty of Metallurgy and Materials Engineering, VSB – Technical University of Ostrava, 17 listopadu 15, 70833 Ostrava, Czech Republic. ' Faculty of Metallurgy and Materials Engineering, VSB – Technical University of Ostrava, 17 listopadu 15, 70833 Ostrava, Czech Republic. ' Faculty of Metallurgy and Materials Engineering, VSB – Technical University of Ostrava, 17 listopadu 15, 70833 Ostrava, Czech Republic. ' VUHZ a.s., 73951 Dobra 240, Czech Republic. ' VITKOVICE – Research and Development, Ltd., Pohranicni 693/31, 70602 Ostrava-Vitkovice, Czech Republic. ' Mittal Steel Ostrava a.s., Vratimovska 689, 70702 Ostrava-Kuncice, Czech Republic. ' Mittal Steel Ostrava a.s., Vratimovska 689, 70702 Ostrava-Kuncice, Czech Republic

Abstract: The heritability of structural properties of the high-carbon steel 1 CS67 during laboratory casting, hot and cold strip rolling, soft annealing, as well as the impact of processing conditions on the final mechanical properties of the strip were studied. Ferrite grain size seems to be more intensively affected by the casting|s cooling rate and subsequent heating time than by the phase transformations before conventional rolling. Owing to higher ferrite content resulting from finer austenite grain size, samples obtained after laboratory remelting and casting are characterised by lower yield stress and strength, in combination with higher ductility. A simple model of mean equivalent stress values dependent on temperature, strain and strain rate was developed using the results of hot flat-rolling tests.

Keywords: high carbon steel; hot charge rolling; cold strip processing; microstructure development; deformation resistance; mechanical properties; materials properties; casting; soft annealing; ferrite grain size; cooling rate; heating time; remelting; phase transformations; stress; strength; ductility.

DOI: 10.1504/IJMMP.2007.014288

International Journal of Microstructure and Materials Properties, 2007 Vol.2 No.2, pp.224 - 237

Published online: 30 Jun 2007 *

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