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在扫描电子显微镜（SEM）较高分辨率条件下．用双磨面方法研究了贝氏体亚结构的三维（3—D）形态发现上贝氏体及其亚片条的三维形态呈板条状，下贝氏体及其正片条的三维形态呈片状，下国氏体亚单元为块状．上、下贝氏体之间在三维形态上无明确界限，存在过渡型的中间态贝氏体，其形态介于上、下贝氏体之间，这说明上、下贝氏体在本质上是统一的．用激发形核—台阶长大理论分析了上、下贝氏体组织形态演化机理，并提出演化过程模型．
Under scanning electron microscopy (SEM) at higher resolution. The three-dimensional (3-D) morphology of the bainite sub-structure was studied by double grinding surface method. The three-dimensional shape of the upper bainite and its sub-strip was strip-like. The three-dimensional shape of the lower bainite and its positive strip Flake, under the austenite subunit for the block. Upper and lower bainite in the three-dimensional morphology is no clear boundary, there is a transitional intermediate bainite, its morphology between the upper and lower bainite, indicating that the lower bainite in essence Is unified. The evolution mechanism of upper and lower bainite microstructure was analyzed by using excitation nucleation - step growth theory, and the evolution process model was proposed.