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

Jacques, Pascal;Cornet, X;Harlet, P;Ladrière, Jean;Delannay, Francis
(1998) Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science — Vol. 29, n° 9, p. 2383-2393 (1998)

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Authors
  • Jacques, PascalUCLouvain
    Author
  • Cornet, X
    Author
  • Harlet, P
    Author
  • Ladrière, JeanUCLouvain
    Author
  • Delannay, Francisorcid-logoUCLouvain
    Author
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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Jacques, P., Cornet, X., Harlet, P., Ladrière, J., & Delannay, F. (1998). Enhancement of the mechanical properties of a low-carbon, low-silicon steel by formation of a multiphased microstructure containing retained austenite. Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, 29(9), 2383-2393. https://doi.org/10.1007/s11661-998-0114-1 (Original work published 1998)