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研究了在光纤激光作用下,碳化物添加对纳米WC复合涂层组织及性能的影响。结果表明,添加了VC和Cr_3C_2得到的涂层未出现明显裂纹和气孔,其显微组织主要由黑色鱼骨状枝晶、柱状晶和灰白色块状组织构成,WC相则基本消失了。当添加VC和Cr_3C_2时,其显微组织的均匀性、晶粒的尺寸细化程度、显微硬度及耐磨性都要优于单独添加VC或Cr_3C_2的情况。与Ti-6Al-4V合金基体对比,所有涂层的显微硬度及耐磨性都有明显提高。其中,基体的磨损机制为磨粒磨损、粘着磨损,而涂层则主要是磨粒磨损、疲劳磨损。
The effects of carbide addition on the microstructure and properties of nano-WC composite coating were studied under the action of fiber laser. The results show that there are no obvious cracks and pores in the coatings with VC and Cr_3C_2 addition. The microstructure is mainly composed of black fish bone dendrites, columnar crystals and gray-white massive structure, while the WC phase basically disappears. When VC and Cr_3C_2 were added, their microstructure homogeneity, grain size refinement, microhardness and wear resistance were better than those of VC or Cr_3C_2 alone. Compared with the Ti-6Al-4V alloy matrix, all coatings have a significant increase in microhardness and wear resistance. Among them, the wear mechanism of the substrate abrasive wear, adhesive wear, and the coating is mainly abrasive wear, fatigue wear.