脉冲磁场对YG6硬质合金力学性能及耐磨性的影响

Effects of Pulsed Magnetic Field on Mechanical Properties and Wear Resistance of YG6 Cemented Carbides

为探索脉冲磁场对硬质合金力学性能和耐磨性的影响,将YG6硬质合金试样用强度为0.5~3 T的脉冲磁场进行处理,并进行了力学性能检测与销盘式摩擦磨损实验。结果表明,0.5 T到3 T的脉冲磁场对YG6硬质合金的维氏硬度影响较弱,且会导致断裂韧性有5%~8%的下降。试样的横向断裂强度随磁场强度的增加先升高后降低,峰值在磁场强度为1.5 T时取得,相比未处理试样提高约8%。经强度为1 T和1.5 T的脉冲磁场处理后,YG6硬质合金的耐磨性有较显著增强,摩擦磨损实验过程中的摩擦系数降低且更加平稳,磨损轨迹光滑,不再有明显的塑性擦伤与颗粒破碎、剥落。

To explore the effect of pulsed magnetic field on the mechanical properties and wear resistance of cemented carbide,the YG6 cemented carbide samples were treated with a pulsed magnetic field with a strength of 0.5 T to 3 T.Then the mechanical properties and pin disk friction-wear tests were carried out.The results show that the pulsed magnetic field of 0.5 T to 3 T has little effect on the Vickers hardness of YG6 cemented carbide,and it leads to a decrease of fracture toughness by 5%to 8%.The transverse rupture strength of the sample increases first and then decreases with the increase of the magnetic field strength,and when the magnetic field strength is 1.5 T,the peak value is obtained,which is about 8%higher than that of the untreated sample.After treatment with pulsed magnetic fields of 1 T and 1.5 T,respectively,the wear resistance of YG6 cemented carbide significantly enhances.The friction coefficient during the friction-wear test reduces and is more stable,and the wear track is smoother,with no more obvious plastic scratches and particle breakage or spalling.