Bainitic transformation under stress in medium alloyed steels

The effects of stress on bainitic transformation are measured in the case o f isothermal transformations of three medium alloyed steels in a temperatur e range where the bainitic transformation is complete. The transformation k inetics variations and transformation plasticity evolutions are analysed fo r applied stress values ranging from zero up to about three times the yield stress of the austenite and compared to the results of the literature. Con sidering a quantitative analysis of the microstructures; formed, the differ ent related mechanisms are discussed.