在本研究中，先在预磨机上进行预磨，然后在150、320、600和1000号砂纸上依次水磨，在抛光机上进行机械抛光后，置于4 ml HNO3 + 96 ml CH3CH2OH混合溶液浸蚀15~25 s，采用FEI Quanta650热场发射扫描电子显微镜分析，观察贝氏体形貌、尺寸与分布等。随着温度升高，在贝氏体铁素体基体上分布着的MA岛的逐渐分解的，在300℃保温15min下的赝品可以观察到MA岛开始分解，400℃与500℃保温15min时在贝氏体铁素体基体发生回复，MA岛继续分解，600℃保温15min时，在贝氏体铁素体基体上分布的MA岛基本完全分解，700℃保温15min时，在贝氏体铁素体基体上分布的MA岛已经完全分解，而且基体有再结晶发生。

In this study, pre-grinding was carried out on a pre-grinding machine, and then water grinding was carried out on sand paper 150, 320, 600 and 1000 in turn. After mechanical polishing on a polishing machine, it was immersed in 4 mL HNO3 + 96 mL CH3CH2OH mixed solution for 15-25 s. FEI Quanta650 thermal field emission scanning electron microscope was used to observe the shape, size and distribution of Baines. With the increase of temperature, the gradual decomposition of MA island distributed on the bainitic ferrite matrix, the forgery at 300℃ for 15min can be observed that the decomposition of MA island began, 400℃ and 500℃ for 15min in bainitic ferrite matrix recovery, MA island continued to decompose, 600℃ for 15min, The MA islands distributed on the bainitic ferrite matrix were decomposed completely, and recrystallization occurred in the matrix after holding at 700℃ for 15min.