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Metals 2016, 6(12), 302; doi:10.3390/met6120302

Ductility of Nanostructured Bainite

1
University of Kaiserslautern, Materials Testing, Gottlieb-Daimler-Str., Kaiserslautern 67663, Germany
2
Department of Physical Metallurgy, National Center for Metallurgical Research (CENIM-CSIC), Avenida Gregorio del Amo, 8, Madrid 28040, Spain
3
Asco Industries CREAS (Research Centre) Metallurgy, BP 70045, Hagondange Cedex 57301, France
4
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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Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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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