金相样品，先在预磨机上进行预磨，然后在150、320、600和1000号砂纸上依次水磨后，在抛光机上进行机械抛光，抛光后的试样置于4 ml 硝酸（HNO3） + 96 ml 无水乙醇（CH3CH2OH）混合溶液浸蚀10~20 s，在Olympus GX53光学显微镜中观察其金相组织。730℃1hWQ+660℃1hAC后微观组织是马氏体组织。SEM样品，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，观察微观组织形貌、尺寸与分布等。在基体中出现少量的残余奥氏体。

The metallographic samples were pre-ground on a pre-grinding machine, then water-ground on sandpaper no. 150, 320, 600 and 1000 successively, and then mechanically polished on a polishing machine. After polishing, the samples were immersed in a mixed solution of 4 mL nitric acid (HNO3) + 96 mL anhydrous ethanol (CH3CH2OH) for 10~20 s. The metallographic structure was observed by Olympus GX53 optical microscope. After 730℃1hWQ+660℃1hAC, the microstructure is martensitic. SEM samples were pre-ground on a pre-grinding machine, and then waterground on sand paper 150, 320, 600 and 1000 in turn. After mechanical polishing on a polishing machine, they were 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 microstructure morphology, size and distribution. A small amount of residual austenite appears in the matrix.