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碳含量为0。85％的奥氏体的形变可以使随后相变形成的贝氏体的抗拉强度显著增加。定量金相测量表明,与非形变奥氏体形成的贝氏体相比,这种强化主要由于增加了铁素体内的位错密度和减小了碳化物的尺寸,从而具有更细密的分布。同时也表明,由于在形变过程产生的不均匀滑移带上,加强了形核和长大,则温度最少可低至200℃,形变奥氏体仍可转变为上贝氏体。然而,这对下贝氏体的形成仅仅起了延缓和减小铁索体片的作用。
The austenite deformation with a carbon content of 0.85% can significantly increase the tensile strength of bainite formed by subsequent phase transformation. Quantitative metallographic measurements show that this strengthening has a more intimate distribution due to increased dislocation density within ferrite and reduced carbide size compared to bainite formed from non-deformed austenite. At the same time, it is also shown that the deformed austenite can still transform into the upper bainite due to the enhancement of nucleation and growth due to the non-uniform slip band generated during the deformation process. However, this only serves to delay and reduce the formation of lower bainite.