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针对Ti-6Al-4V耐磨性差的问题,采用激光熔覆技术在Ti-6Al-4V基材表面通过旁轴添加与基材同质的Ti-6Al-4V丝材,同轴送入WC颗粒作为强化相的方式制备表面WC颗粒增强钛基复合材料层。激光功率、扫描速度、送丝速度等工艺参数是影响复合材料层成形的主要工艺因素,通过实验确定了优化的工艺参数。采用SEM,EDS以及XRD对复合材料层的显微组织进行了研究。研究表明,复合材料层中主要包括WC、W_2C、Ti C、α-Ti、W相。复合材料层中WC颗粒呈现不同形态。Ti C、W_2C相形成并以不同形态分布于表面复合材料层中。WC颗粒与Ti之间的反应区由多层组成,分别为W_2C、W、Ti C。性能分析发现,复合材料层的硬度HV0.2达到了5.70 GPa,较基体提高了1倍。表面复合材料层的摩擦系数为0.3,而钛基体的摩擦系数为0.5。与基体相比,表面复合材料层摩擦系数显著降低。
In order to solve the problem of poor wear resistance of Ti-6Al-4V, laser cladding was used to add Ti-6Al-4V wires homogeneously to the substrate on the surface of Ti-6Al-4V substrate by co- A surface WC particle reinforced titanium-based composite layer was prepared as a reinforcing phase. Laser power, scanning speed, wire feeding speed and other process parameters affect the forming of the composite material layer of the main process factors, through the experiment to determine the optimal process parameters. The microstructure of the composite layer was investigated by SEM, EDS and XRD. The results show that the composites mainly include WC, W 2 C, Ti C, α-Ti and W phases. WC particles in the composite layer show different morphology. Ti C, W_2C phase and in different forms distributed in the surface of the composite material layer. The reaction zone between the WC particles and Ti consists of multiple layers, namely W_2C, W, TiC. Performance analysis found that the composite material hardness HV0.2 reached 5.70 GPa, compared with the matrix increased by 1 times. The coefficient of friction of the surface composite layer was 0.3, while the coefficient of friction of the titanium substrate was 0.5. The coefficient of friction of the surface composite layer is significantly lower than that of the matrix.