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Kinetic and Thermodynamic Aspects of the Bainite Reaction in a Silicon Steel

Published online by Cambridge University Press:  21 February 2011

G. Papadimitriou  and
J.M.R. Genin
G. Papadimitriou
Affiliation:
Department of Mining and Metallurgy, National Technical University of Athens, 42 Patission Street, Athens, Gr 147
J.M.R. Genin
Affiliation:
Department of Mining and Metallurgy, National Technical University of Athens, 42 Patission Street, Athens, Gr 147 Département des sciences et techniques des Matériaux, Institut des Sciences de l'Ingénieru, Université de Nancy 1, Vandoeuvre - Nancy, France 54500
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Abstract

The bainite reaction in an Fe - 3.85 wt pct Si - 0.9 wt pct C steel is studied by several experimental techniques in the range of 250–450°C.

The high silicon content prevents the formation of cementite, so that the reaction is separated to two clearly distinct stages. In the primary stage ferrite forms alone, except at temperatures lower than 310°C where some carbides precipitate in it, and austenite becomes enriched in carbon. In the secondary stage occurring only above 400°C, the enriched austenite decomposes to ferrite and an unknown silicon carbide.

The microstructure, the enrichment of the austenite and the overall reaction kinetics of the two stages are studied and are found to be consistent with a displacive mechanism of the bainite reaction.

A tentative model, accounting for the competition of shear and diffusion, is proposed in order to fit our experimental data.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 21: Symposium GREECE – Phase Transformations in Solids , 1983 , 747
Copyright
Copyright © Materials Research Society 1984

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References

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