A hot rolled TRIP steel was selected for the laboratory scale process simulation. The ferrite and bainite transformation kinetics on the run out table and during coiling were mapped as a function of temperature and austenite conditioning by Leblond and Devaux’s concept. The updated carbon content in the remaining austenite is the key factor to control following bainite formation. The microstructure was characterized by LOM, SEM, FEG EPMA. The mean carbon content was taken from the in-situ high energy XRD. Proper process window or austenite conditioning can be predicted for the required fractions of phases. Enough carbon enrichment of austenite can be achieved by forming carbide free bainite alone without the formation of ferrite at higher temperature. However, its fraction can be too low to exhibit the TRIP effect. Therefore, pre-deformation such that in the hot rolling process is still necessary.Keywords: Bainite, TRIP steel, modelling, characterisation
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