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用扫描隧道显微镜对Fe-C-Si-Mn合金中的下贝氏体浮突进行了观察研究发现用透射显微镜观察到的最小结构单元——亚单元是由更小的超亚单元组成的超亚单元的浮突为“帐篷”型，而非不变平面应变型，表明它不是切变形成；超亚单元的浮突高度为60-140nm，最大形状变型量约为0．23．贝氏体的多层次结构以及合金无素C和Si对它的影响可用激发形核-台阶生长机制来解释.
The observation of the lower bainite bump in the Fe-C-Si-Mn alloy by scanning tunneling microscopy revealed that the smallest unit of structure observed by transmission electron microscopy, the subunit, is composed of smaller super-subunits The subunit has a “tent” type of buoyancy instead of an invariant plane strain, indicating that it is not shear-formed; the height of the sub-unit is 60-140 nm and the maximum deformation is about 0.23. The multi-layer structure of bainite and the effect of alloying element C and Si can be explained by the excited nucleation-step growth mechanism.