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Metals 2016, 6(12), 302;

Ductility of Nanostructured Bainite

University of Kaiserslautern, Materials Testing, Gottlieb-Daimler-Str., Kaiserslautern 67663, Germany
Department of Physical Metallurgy, National Center for Metallurgical Research (CENIM-CSIC), Avenida Gregorio del Amo, 8, Madrid 28040, Spain
Asco Industries CREAS (Research Centre) Metallurgy, BP 70045, Hagondange Cedex 57301, France
Robert Bosch GmbH, Materials- and Process Engineering Metals, Renningen, Stuttgart 70465, Germany
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 25 October 2016 / Revised: 21 November 2016 / Accepted: 25 November 2016 / Published: 2 December 2016
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Nanostructured bainite is a novel ultra-high-strength steel-concept under intensive current research, in which the optimization of its mechanical properties can only come from a clear understanding of the parameters that control its ductility. This work reviews first the nature of this composite-like material as a product of heat treatment conditions. Subsequently, the premises of ductility behavior are presented, taking as a reference related microstructures: conventional bainitic steels, and TRIP-aided steels. The ductility of nanostructured bainite is then discussed in terms of work-hardening and fracture mechanisms, leading to an analysis of the three-fold correlation between ductility, mechanically-induced martensitic transformation, and mechanical partitioning between the phases. Results suggest that a highly stable/hard retained austenite, with mechanical properties close to the matrix of bainitic ferrite, is advantageous in order to enhance ductility. View Full-Text
Keywords: nanostructured bainite; ductility; microstructure; mechanical properties nanostructured bainite; ductility; microstructure; mechanical properties

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Morales-Rivas, L.; Garcia-Mateo, C.; Sourmail, T.; Kuntz, M.; Rementeria, R.; Caballero, F.G. Ductility of Nanostructured Bainite. Metals 2016, 6, 302.

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