A NEW M ETHOD TO COMPUTE THE BEHAVIOR OF PHASE TRANSFORMATIONS AND DEPTH OF THE DECARBURIZED FERRITE LAYER, SCALE THICKNESS OF STEEL FROM MEASURED TEMPERATURES

摘要

An new method is proposed to predict in sequence the phase transformation behavior and the depth of the decarburized ferrite layer with simultaneous scaling of a steel during cooling process from the measured temperature history. This proposed method successively couples a set of mathematical models describing the temperature evolution, phase transformation, decarburization and oxidation. The dilatometry experiment was performed to verify the proposed method. Results reveal that the measured depth of the decarburized ferrite layer agreed well with the predicted depth. The predicted pearlite volume fraction nearly coincided with the measured value as well.