Latest advance in theoretical study on bainite phase transformation

It is significant theoretically and practically to study the bainite phase transformation theory.The focus problems of academic debate about bainite phase transformation were summarized.The wrong viewpoints of both shear and diffusion schools were rebutted through lots of experimental facts and theoretical analyses.The correct definition of bainite was put forward.It is pointed out that the transition is the principle character of bainite phase transformation and there exist the fundamental differences between bainite phase transformation and eutectoid decomposition/martensite phase transformation.The surface relief of bainite is in tent type rather than in N type,which has no shear characteristics.The bainite phase transformation process indicated neither shear nor diffusion from the aspects of thermodynamics,dynamics and crystallology by integrating in a systematic way.The nucleation-growth mechanism of bainitic ferrite and bainitic carbide is proposed,which is non-synergic thermal activation transition of interface atoms,conesponding with the facts.