在本研究中，将水磨抛光后的试样，在10 ml HClO4 + 90 ml C2H5OH混合溶液中进行电解抛光，电压与时间分别为10~20 V和10~15 s。使用配备有Oxford Nordlys F+型EBSD附件的FEI Quanta 650热场发射电子显微镜进行晶体学数据采集，并获取界面取向差分布等，扫描面积为80×100 μm，扫描步长为0.1~0.2 μm，观察发现在300℃到600℃保温15min的样品中，贝氏体组织中小角度界面逐渐降低，直到在700℃保温15min样品中，观察到贝氏体组织中小角度界面再次增多。

In this study, water polished samples were electrolytically polished in 10 mL HClO4 + 90 mL C2H5OH mixed solution at a voltage of 10~20 V and 10~15 s, respectively. The FEI Quanta 650 thermal field emission electron microscope equipped with Oxford Nordlys F+ EBSD attachment was used to collect crystallography data and obtain the interface orientation difference distribution. The scanning area was 80×100 μm and the scanning step size was 0.1~0.2 μm. It was observed that the small and medium Angle interface of bainite tissue decreased gradually in the sample held at 300℃ to 600℃ for 15min, until the small and medium Angle interface of bainite tissue increased again in the sample held at 700℃ for 15min.