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Metals 2017, 7(1), 31; doi:10.3390/met7010031

Tensile Ductility of Nanostructured Bainitic Steels: Influence of Retained Austenite Stability

1
Ascometal CREAS, Avenue de France, 57300 Hagondange, France
2
Department of Physical Metallurgy, National Center for Metallurgical Research (CENIM-CSIC), Avda. Gregorio del Amo, 8, E-28040 Madrid, Spain
3
University of Kaiserslautern, Materials Testing, Gottlieb-Daimler-Str., 67663 Kaiserslautern, Germany
4
Robert Bosch GmbH, Materials- and Process Engineering Metals, Renningen, 70465 Stuttgart, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 19 December 2016 / Revised: 9 January 2017 / Accepted: 16 January 2017 / Published: 23 January 2017
(This article belongs to the Special Issue Bainite and Martensite: Developments and Challenges)
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Abstract

High silicon (>1.5%) steels with different compositions were isothermally transformed to bainite at 220 and 250 °C to produce what is often referred to as nanostructured bainite. Interrupted tensile tests were carried out and the retained austenite was measured as a function of strain. Results were correlated with tensile ductility. The role of retained austenite stability is remarkably underlined as strongly affecting the propensity to brittle failure, but also the tensile ductility. A simple quantitative relationship is proposed that clearly delimitates the different behaviours (brittle/ductile) and correlates well with the measured ductility. Conclusions are proposed as to the role of retained austenite fraction and the existence of a threshold value associated with tensile rupture. View Full-Text
Keywords: high carbon steels; nanobainite; low temperature bainite; tensile ductility; retained austenite stability; transformation induced plasticity (TRIP) high carbon steels; nanobainite; low temperature bainite; tensile ductility; retained austenite stability; transformation induced plasticity (TRIP)
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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

Sourmail, T.; Garcia-Mateo, C.; Caballero, F.G.; Morales-Rivas, L.; Rementeria, R.; Kuntz, M. Tensile Ductility of Nanostructured Bainitic Steels: Influence of Retained Austenite Stability. Metals 2017, 7, 31.

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