The Use of Acoustic Emission and Neural Network in the Study of Phase Transformation below M.

Acoustic emission and dilatometry were applied to investigate the characteristics of phase transformations in bearing steel 100CrMnSi6-4 during austempering below the martensite start temperature (M 175 °C) at 150 °C. The aim of this study is to characterize the product of transformation occurring below the M temperature using various research methods. Analysis of the dilatometric curves shows that, after the formation of athermal martensite below the M temperature, the austenite continues to undergo isothermal transformation, indicating the formation of bainite.