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通过电火花强化工艺在不锈钢机械臂表面制备了YG8强化层,采用金相显微镜、X射线衍射分析、硬度和摩擦磨损试验等对物相组成、硬度分布和耐磨性能进行了测试,并分析了表面强化层的作用机理。结果表明,表面强化层中的物相组成为Co_3W_3C、Fe_3W_3C、Fe_7W_6C、Fe_3Mo_3C、W_2C和(Fe,Cr)相;不锈钢机械臂表面强化层的显微硬度远远大于基材硬度,且中间过渡区硬度也相较于基材更高;在相同摩擦磨损时间下,不锈钢基体的摩擦系数都高于表面强化层;不锈钢机械臂表面强化层的相对耐磨性为基体的3.4倍,其磨损机制为磨粒磨损。
The YG8 reinforced layer was prepared on the surface of the stainless steel arm by EDM. The phase composition, hardness distribution and wear resistance were tested by metallographic microscope, X-ray diffraction analysis, hardness and friction and wear test. The mechanism of surface strengthening layer. The results show that the phase composition of the surface strengthened layer is Co_3W_3C, Fe_3W_3C, Fe_7W_6C, Fe_3Mo_3C, W_2C and (Fe, Cr) phases. The microhardness of stainless steel arm surface strengthening layer is far greater than the hardness of the substrate, The hardness is also higher than the substrate; under the same friction and wear time, the friction coefficient of the stainless steel substrate is higher than the surface strengthening layer; the relative wear resistance of the stainless steel arm surface strengthening layer is 3.4 times that of the substrate, the wear mechanism is Abrasive wear.