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Bainite Formation in Carbon and Nitrogen enriched Low Alloyed Steels: Kinetics and Microstructures

Teixeira, Julien and Catteau, Simon D. and Van Landeghem, Hugo P. and Dulcy, Jacky and Dehmas, Moukrane and Redjaïmia, Abdelkrim and Denis, Sabine R.D. and Courteaux, Marc Bainite Formation in Carbon and Nitrogen enriched Low Alloyed Steels: Kinetics and Microstructures. (2018) HTM Journal of Heat Treatment and Materials, 73 (3). 144-156. ISSN 1867-2493

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Official URL: https://doi.org/10.3139/105.110352

Abstract

The effect on the bainite formation of carburizing (0.6 wt.% C), nitriding (0.12 wt.% C-0.25 wt.% N) and carbonitriding (0.7 wt.% C-0.25 wt.% N) of a 23MnCrMo5 low-alloyed steel in the austenitic field was examined by in situ high-energy synchrotron X-ray diffraction (HEXRD) and transmission electron microscopy. The enrichment in nitrogen induces strong acceleration of the bainite transformation kinetics in carbonitrided steel compared to carburized steel, despite the γ-stabilizing character of nitrogen. This is attributed to the nucleation of ferrite on CrN nitrides, which precipitated during the enrichment, either at γ grain boundaries or intragranularly. AlN, VN and MnSiN2 nitrides were observed as well, with much smaller number density. They formed frequently aggregates with the CrN nitrides. The bainite microstructure is much finer than in initial or carburized steel. It shares some common features with intragranularly nucleated bainite, i. e. acicular ferrite. From HEXRD, the chronology of the phase formation (ferrite and precipitates) during bainite formation as well as cell parameter evolutions are analyzed.

Item Type:Article
Additional Information:Full text not available from this repository
Audience (journal):International peer-reviewed journal
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Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Nationale d’Ingénieurs de Metz - ENIM (FRANCE)
Other partners > Arts et Métiers Sciences et Technologies - ENSAM (FRANCE)
Other partners > Institut polytechnique de Grenoble (FRANCE)
Other partners > PSA Peugeot Citroën (FRANCE)
Other partners > Université de Lorraine (FRANCE)
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Deposited On:23 Apr 2021 12:13

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