本文对20钢室温形变后直接渗碳和经多边化处理后进行渗碳的组织进行了金相分析和薄膜透射电镜观察。试验结果表明:在渗碳过程中,由于碳原子的不断渗入并与形变组织中位错结构的相互作用,使试样由表层至心部的组织发生了不同的变化。稳定的多边化亚组织提供了更多的通道,加速了碳原子的扩散过程。 In this paper, the microstructure and microstructure of 20 steel after direct carburizing and carburizing after multilateral treatment were observed by TEM. The results show that during the carburizing process, the microstructure changes from the surface to the heart due to the continuous infiltration of carbon atoms and the interaction with the dislocation structure in the deformed structure. A stable multilateral sub-organization provides more channels and speeds up the diffusion of carbon atoms.