对铁路辙叉用高锰钢进行不同变形量的大吨位快速压缩试验,采用金相显微镜、透射电子显微镜以及X射线衍射仪等方法对变形样品的微观组织进行分析,研究高锰钢在压缩状态下的加工硬化机理。结果表明,在压缩状态下,高锰钢以形变孪晶硬化为主,亚结构主要为孪晶和位错缠结,硬化组织中没有发现形变诱发马氏体;随着变形量的增加,晶粒畸变严重,孪晶密度增大,硬度升高,变形量达到40%时,硬化程度趋于饱和。 Rapid deformation tests of high-manganese steel with different deformations on the rail frogs were carried out. The microstructure of the deformed samples was analyzed by metallographic microscope, transmission electron microscope and X-ray diffraction. Under the work hardening mechanism. The results show that in the compression state, the high-manganese steel is dominated by deformation twinning and the substructures are mainly twins and dislocations. No deformation-induced martensite is found in the hardened microstructure. With the increase of deformation, Severe grain distortion, twin density increases, the hardness increases, the deformation of 40%, the degree of hardening tends to be saturated.