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对爆炸后高锰钢的表层和亚表层的物相进行XRD分析,对爆前、爆后衍射花样进行标定,对显微组织进行对比分析。结果表明:爆炸硬化处理后高锰钢的组织仍为奥氏体,未发生马氏体转变。爆炸硬化的微观机理为:在炸药爆炸产生的巨大爆轰压力作用下,爆后高锰钢晶体各晶面的晶格常数增大,加剧了晶格畸变,在高锰钢内部形成大量位错和层错,这些高密度的位错和层错阻碍位错运动,使高锰钢硬化。
XRD analysis of the surface and subsurface phases of high manganese steel after blasting was carried out, the diffraction pattern of the front and the back of blasting was calibrated, and the microstructure was comparatively analyzed. The results show that the microstructure of the high manganese steel is still austenite without martensite transformation. The microscopic mechanism of explosion hardening is as follows: Under the huge detonation pressure generated by explosive detonation, the lattice constant of each crystal plane of explosive high manganese steel crystal increases, which aggravates the lattice distortion and forms a large number of dislocations in the interior of high manganese steel And stacking faults, these high-density dislocations and stacking faults impede dislocation movement and harden the high manganese steel.