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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。
The microstructure and mechanical properties of the high manganese steel samples after laser shock (LSP) were investigated by microscopic analysis with H-800 transmission electron microscope and JSM-5610LV scanning electron microscope. The results show that the hardness of high manganese steel increases significantly after laser shock (LSP) , The phenomenon of work hardening appears, the impact center hardness increased from 219 HV to 486 HV, an increase of about 122%. During the laser shock, the material underwent more severe plastic deformation, generating a large number of dislocations, forming dislocations and dislocations, as well as dislocation cells. With the increase of deformation, a large number of twins appeared in the structure. Twins and dislocations work together, so that grain boundaries, phase boundary and other interfaces were destroyed, the grain was refined to form sub-crystal. Dislocations, twins and fine grain strengthening together, so that the performance of high manganese steel increased dramatically.