In order to study the effect of external field treatment on mechanical properties, cutting performance, microstructure of cemented carbide, the cemented carbide samples were treated by different magnetic field frequency (f=0.3 Hz, 0.4 Hz, 0.5 Hz) processing methods using self-made electromagnetic compound treatment device. On the basis of the study of this method, the electromagnetic compound treatment method was proposed to couple pulsed magnetic field and pulsed current. The results show that after the treatment of magnetic field frequency, the hardness of the sample slightly higher than that untreated sample, the increase value of percent between 0.5% and 1.3%, the value of hardness was 1594.72 HV, 1587.76 HV, 1582.45 HV, the longer the magnetization time, the higher the hardness; the cutting performance was increased, which means the tool life was increased, the increase value of percent from 4.5% to 7.0%. After electromagnetic compound treatment, the increase value of percent was 1.7% and 2.3%, the value of hardness was 1601.6 HV, 1609.82 HV; the tool life was increased 7.5% and 8.4%. After external field treatment, the angular state of wolfram carbide (WC) particle was transformed into smooth state and was more evenly distributed.
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