Modelling of austenitisation process in a eutectoid steel
DOI:
https://doi.org/10.3989/revmetalm.2001.v37.i5.523Keywords:
Steels, Eutectoid, Kinetics, Phase transformations, Modelling,Abstract
A model describing the pearlite-to-austenite transformation during continuous heating in an eutectoid steel has been developed. In that model, Avrami equation has been successfully applied to calculate the austenite volume fraction formed under non-isothermal conditions. The influence of parameters such as interlamellar spacing and edge length of pearlite colonies and heating rate on the austenite formation kinetics has been experimentally studied and considered in the modelling. It has been found that the kinetics of austenite formation is slower the coarser the initial pearlite microstructure and the higher the heating rate. Moreover, both start and finish temperatures of the transformation slightly increase as heating rate does, but finish temperatures are more sensitive to that parameter. A good agreement (accuracy higher than 90% in square correlation factor) between experimental and predicted values has been found.
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