The influence of stress and strain on kinetics of bainite transformation

The influence of stress and strain on the kinetics and transformation plasticity of bainite transformation has been studied using a 26Cr2Ni4MoV steel by thermal simulation experimental method. It has been found that as applied stress increases the maximum volume fraction of bainite increases for applied stress lower than the yield stress but decreases for applied stress higher than the yield stress. This is believed to be related with the strengthening of parent phase due to pre-deformation. Experimental results indicate that applied stress accelerates bainite transformation. When applied stress is lower than the yield stress, the parameter of transformation plasticity increases with applied stress while it becomes a constant for stress larger than yield stress.