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Article (Scientific journals)
On the influence of aluminium and silicon contents on the kinetics of bainite transformation of intercritical austenite
Mertens, Anne  ; Jacques, Pascal J.; Zhao, Lie et al.
2003 • In Journal de Physique IV, 112, p. 305-308
Peer reviewed
 

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Keywords :
TRIP-assisted steels; Phase transformations; Dilatometry; Heat treatment
Abstract :
[en] TRIP-assisted steels show enhanced mechanical properties thanks to the strain-induced transformation of retained austenite to martensite (TRIP effect). Stabilisation of austenite is made possible by the combination of appropriate chemical composition (containing classically high levels of silicon, or, as developed more recently, aluminium) and of a two-steps heat treatment comprising an intercritical annealing followed by an isothermal holding in the bainite formation range. A detailed understanding of the effects of both elements on the bainite transformation kinetics is thus of primary importance for the optimisation of austenite retention. The present study aims at a better knowledge of the influence of aluminium levels on the kinetics of the bainite transformation of intercritical austenite, as compared to the effect of silicon. The bainite transformation kinetics was followed by dilatometry in a set of 6 steel grades with varying aluminium and silicon contents. These dilatometry experiments were coupled with a characterisation of the microstructures by X-ray diffraction, SEM and image analysis. It was shown that aluminium has a less pronounced effect than silicon in retarding the bainite transformation
Disciplines :
Materials science & engineering
Author, co-author :
Mertens, Anne  ;  Delft University of Technology > Laboratory for Materials Science
Jacques, Pascal J.;  Université Catholique de Louvain - UCL > Départment des Sciences des Matériaux et des Procédés > PCIM
Zhao, Lie;  Netherlands Institute for Metals Research
Kruijver, Suzelotte O.;  Netherlands Institute for Metals Research
Sietsma, Jilt;  Delft University of Technology > Laboratory for Materials Science
Delannay, Francis;  Université Catholique de Louvain - UCL > Département des Sciences des Matériaux et des Procédés > PCIM
Language :
English
Title :
On the influence of aluminium and silicon contents on the kinetics of bainite transformation of intercritical austenite
Publication date :
2003
Journal title :
Journal de Physique IV
ISSN :
1155-4339
eISSN :
1764-7177
Publisher :
EDP sciences, Les Ulis, France
Volume :
112
Pages :
305-308
Peer reviewed :
Peer reviewed

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