Effect of Stress on Bainitic Transformation in Steel
应力对钢中贝氏体相变的影响

Under the effect of stresses, the interphase energy may be reduced and probably the carbon atoms may redistribute, e.g., segregate at grain boundaries or other defects, and even the carbide may precipitate, resulting in the increase of the driving force for nucleation, in turn, marked raise of the nucleation rate and acceleration of incubation for bainitic transformation. The kinetics under stress is consistent with the kinetics model of ferrite and pearlite transformations under stress, i.e., the modified Avrami equation. Prior deformation of austenite may at first promote the bainite formation but may lead the occurrence of the mechanical stabilization of austenite at some later stage. The mechanism of the mechanical stabilization of austenite during bainite reaction may not be completely analogous with that during martensitic transformation, and it may only be the result from the hindrance of directional growth of bainite by dislocations formed in deformation, retarding the overall transformation kinetics. Model of the austenite mechanical stabilization is expected to be established.