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采用强流脉冲电子束对齿轮常用材料40Cr进行辐照,通过表面的形貌特征、表层组织以及显微硬度变化,研究该技术用于齿轮材料表面强化的效果。结果表明,在相同的24kV电压下,脉冲次数的增加能降低熔坑数量,改善材料表面的平整性、完整性;电子束照射在表面形成具有一定厚度的高硬度熔凝层,熔凝层厚度增加,能够提高材料的表面硬度;40Cr经25次照射处理,其表面能够获得6μm厚的熔凝层,达到65次照射下熔凝层厚度的3倍,其表面硬度最高达到547 HV0.05,为基体表面硬度296 HV0.05的1.85倍,强流脉冲电子束表面处理后对齿轮材料40Cr具有一定的强化效果。
High intensity pulsed electron beam was used to irradiate 40Cr, a common material of gears. The effect of this technique on the surface strengthening of gear materials was studied by the morphological features, surface microstructure and microhardness of the gear. The results show that under the same voltage of 24 kV, the increase of pulse number can reduce the number of craters and improve the flatness and integrity of the material surface. The electron beam irradiates a high hardness layer with a certain thickness on the surface, and the thickness of the fused layer Increase 40Cr after 25 times irradiation, the surface can be obtained 6μm thick fused layer, reaching 65 times the thickness of the fused layer 3 times, the surface hardness up to 547 HV0.05, Which is 1.85 times higher than the surface hardness of 296 HV0.05. After the surface treatment of the intense pulsed electron beam, the gear material 40Cr has a certain strengthening effect.