将水韧高锰钢试样进行激光冲击，利用H-800透射电镜和JSM-5610LV扫描电镜对试样进行微观分析，得出以下结论：高锰钢在激光冲击(LSP)后硬度会显著增加，出现加工硬化现象，冲击中心点硬度由219 HV升高到486 HV，升高了大约122%。在激光冲击过程中，材料经受了较严重的塑性变形，生成大量的位错，进而形成位错塞积以及位错胞状组织等，随变形增加，结构中出现大量孪晶。孪晶和位错共同作用，从而使晶界、相界等界面遭到破坏，晶粒得到细化，形成亚晶。位错、孪晶与细晶强化共同作用，使高锰钢的性能大幅提高。

Water toughened high manganese steel is treated by laser shocking, and the micro-structure is analyzed by H-800 transmission electron microscope and JSM-5610LV scanning electron microscope. The results show that the hardness of high manganese steel will increase significantly after laser shock processing (LSP) and hardening will occur. The hardness of the impacted center increases from 219 HV to 486 HV, which rises about 122%. In the LSP, a more severe plastic deformation is undergone on the materials, a large number of dislocations are generated, and thus the dislocation block and the cellular structure of dislocations form. With the deformation increasing, a large number of twins are generated in the structure. So the grain boundaries, phase boundaries and other interfaces are destroyed by twinning and dislocation interaction, and grain refinement forms. Dislocations and twins share the role with the fine grain strengthening, so a substantial increase of the performance is emerged in high manganese steel.