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Enhancement of the mechanical properties of a low-carbon, low-silicon steel by formation of a multiphased microstructure containing retained Austenite

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Abstract

Dual-phase and transformation-induced plasticity (TRIP)-assisted multiphase steels are related families of high-strength formable steels exhibiting excellent mechanical characteristics. This study shows how a ferrite-bainite-martensite microstructure containing retained austenite can improve the mechanical properties of a cold-rolled low-carbon, low-silicon steel. Such a multiphased microstructure is obtained by a heat treatment involving intercritical annealing followed by a bainite transformation tempering. Depending on the heat-treatment parameters, the samples present a variety of microstructures. Due to the presence of retained austenite, some samples exhibit a TRIP effect not anticipated with such a low silicon content. A composite strengthening effect also results from the simultaneous presence of a ductile ferrite matrix with bainite and martensite as hard second phases. A true stress at maximum load of 800 MPa and a true uniform strain of 0.18 can be obtained by forming a ferrite-bainite-martensite microstructure containing up to 10 pct of retained austenite. These properties correspond to a favorable evolution of work hardening during plastic deformation.

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Authors and Affiliations

  1. the Département des Sciences des Matériaux et des Procédés, Université Catholique de Louvain, B-1348, Louvain-la-Neuve, Belgium

    P. Jacques (Graduate Student) & F. Delannay (Professor)

  2. the Research and Development Center, Cockerill Sambre Group, B-4000, Liège, Belgium

    X. Cornet (Research Engineer) & Ph. Harlet (Engineer and Head of Products Research Department)

  3. the Laboratoire de Chimie Inorganique et Nucléaire, Université Catholique de Louvain, B-1348, Louvain-la-Neuve, Belgium

    J. Ladriere (Professor)

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  1. P. Jacques
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  2. F. Delannay
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  3. X. Cornet
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  4. Ph. Harlet
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  5. J. Ladriere
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Jacques, P., Delannay, F., Cornet, X. et al. Enhancement of the mechanical properties of a low-carbon, low-silicon steel by formation of a multiphased microstructure containing retained Austenite. Metall Mater Trans A 29, 2383–2393 (1998). https://doi.org/10.1007/s11661-998-0114-1

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  • DOI: https://doi.org/10.1007/s11661-998-0114-1

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