The parameter k in the transformation plasticity model for bainitic and martensitic transformations is determined by experiments on four types of steel. The relationships between k and stress and chemical composition of the steels subjected to bainitic and martensitic transformations are obtained. In addition, based on experiments using 26Cr2Ni4MoV steel, the value of k is found first to increase with the increment of stress and then to remain unchanged when predeformation before transformation occurs.
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