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，在贝氏体铁素体基体发生回复，MA岛继续分解，基体变形明显。

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 analyze the shape, size and distribution of Bainitic ferrite. Recovery occurred in the bainitic ferrite matrix, MA island continued to decompose, and the matrix deformation was obvious.