In order to study the effect of pulse current treatment on the mechanical properties, microstructure and cutting performance of YG8 cemented carbide, experiments were carried out by using self-made pulse current treatment device to treat cemented carbide samples with different current densities ( J = 5, 10 and 15 A·mm −2 ). After the treatment of pulse current, when the current density increased from 5 to 15 A·mm −2 , the hardness of the sample was improved to HV 1605, HV 1629 and HV 1653 from HV 1574; the transverse rupture strengths of the sample were 2136, 2289 and 2364 MPa, which were all higher than that of the untreated sample (2062 MPa), increasing by 3.6%, 11.0% and 14.6%, respectively; the corresponding cutting performance was increased by 10.1%, 13.9% and 19.4%, compared to that of the untreated tool. The tool’s life was also improved. After the treatment of pulse current, pulse current provided the driving force for dislocation motion, making it more likely for the dislocation to multiply and slip, the dislocation density was increased, and the mechanical properties were significantly improved.

中文翻译：

---

不同脉冲电流下YG8硬质合金的组织与性能

为研究脉冲电流处理对YG8硬质合金力学性能、显微组织和切削性能的影响，利用自制脉冲电流处理装置对不同电流密度的硬质合金试样进行处理（J=5）。 , 10 和 15 A·mm -2 )。脉冲电流处理后，当电流密度从5 A·mm -2 增加到15 A·mm -2 时，试样的硬度由HV 1574提高到HV 1605、HV 1629和HV 1653；试样的横向断裂强度分别为2136、2289和2364 MPa，均高于未处理试样（2062 MPa），分别提高了3.6%、11.0%和14.6%。与未经处理的刀具相比，相应的切削性能分别提高了 10.1%、13.9% 和 19.4%。该工具的使用寿命也得到了改善。