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在煤油、雾和混AL粉准干式工作介质中对H13钢进行电火花表面强化,以钛合金为工具电极,并对强化层的微观组织、厚度及硬度进行了分析。分析结.果表明,在3种不同工作介质条件下获得的强化层组织均呈橘皮状,且强化层截面由表及里依次由白亮层、过渡层和基体组成。在混AL粉准干式介质条件下的强化层表面更平整,组织更致密,且强化层的厚度比雾和煤油工作介质条件下的厚度要高,分布也更均匀。强化层的硬度较基体H13钢均有大幅提高,且在混AL粉准干式工作介质条件下的平均显微硬度明显高于雾状和煤油介质条件下的强化层硬度。
In the kerosene, mist and mixed AL powder quasi-dry working medium on the H13 steel EDM surface enhanced with titanium alloy as the tool electrode, and the strengthening layer of the microstructure, thickness and hardness were analyzed. Analysis results show that in the three different working conditions under the conditions of the reinforced layer were orange-peel, and the reinforced layer cross-section from the table and then by the white layer, transition layer and the matrix composition. The surface of the strengthening layer is more smooth and the structure is more compact under the condition of the quasi-dry medium with the mixed AL powder, and the thickness of the strengthening layer is higher than the thickness under the working medium of fog and kerosene, and the distribution is more even. The hardness of the strengthened layer is much higher than that of the matrix H13 steel, and the average microhardness of the mixed layer under the quasi-dry working medium is obviously higher than that of the H13 steel under the mist and kerosene medium conditions.