Abstract:The kinetics of austenite formation in a new type copper-bearing steel, with initial microstructure composed of ferrite and bainite during continuous heating, by using dilatometric analysis and measurements. The formation of austenite was observed to occur in two stages. The first stage is the dissolution of ferrite and most bainite, followed by the bainite to austenite. The first stage takes place through diffusion and the second step through shear. The critical temperature of austenite formation in continuous heating increases with increasing heating rates, which therefore exerts a greater influence on the As1 temperature of the austenite formation. Kinetic calculation shows that the process is mainly controlled by diffusion when the heating rate is over 1℃/s.
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