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对9SiCr钢进行了电火花表面强化处理,研究了不同的电容量和比强化时间对9SiCr钢表面强化层厚度、显微硬度和表面粗糙度的影响。结果表明:分别在比强化时间不变、电容量从30μF提高到300μF和电容量维持不变、比强化时间由1 min·cm~(-2)升至5 min·cm~(-2)的过程中,表面强化层厚度和显微硬度均表现出先升后降的变化规律,而表面粗糙度表现为持续增大。当选用电容量为240μF、比强化时间3 min·cm-2时,9SiCr钢的表面强化层获得了最佳综合性能,厚度和显微硬度值分别为50.2μm和1 411 HV。
The surface treatment of 9SiCr steel was carried out by EDM. The effects of different electric capacity and specific strengthening time on the surface strengthening layer thickness, microhardness and surface roughness of 9SiCr steel were studied. The results show that the specific capacitance increases from 30μF to 300μF and the capacitance remains unchanged at the specific strengthening time, and increases from 1 min · cm -2 to 5 min · cm -2 During the process, both the thickness and the microhardness of the surface strengthened layer showed the law of increasing and then decreasing, while the surface roughness showed a continuous increase. When the selected capacitance was 240μF and the specific strengthening time was 3 min · cm-2, the surface strengthened layer of 9SiCr steel obtained the best comprehensive properties, and the thickness and microhardness values were 50.2μm and 1 411 HV, respectively.