ISSN   1004-0595

CN  62-1224/O4

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球墨铸铁表面多层织构制备及其摩擦学性能研究

Preparation of Multilayer Textures on Ductile Cast Iron and Their Tribological Performance

  • 摘要: 球墨铸铁因其具有良好的机械性能在发动机曲轴等高负荷摩擦副中被广泛应用,但在工程应用中仍不可避免地发生摩擦学性能失效状况. 本文中采用激光加工技术在球墨铸铁表面制备规则阵列织构、原位织构以及多层织构,并对上述织构阵列进行了微流域仿真,研究不同类型织构对摩擦副表面流体动压润滑效应的影响,通过油润滑条件下不同类型表面织构的摩擦学性能测试与分析,探究不同类型织构对球墨铸铁表面摩擦学性能的影响机理. 结果表明:多层织构在提升流体动压方面效果更加显著,相对面积密度为9%和16%的规则阵列织构和原位织构的流体动压分别提升了14.7%、21.1%和3.9%;与未织构试样相比,3种织构试样均改善了材料的耐磨性能,磨损率降低了66%以上. 多层织构结合了阵列织构和原位织构的优势,通过提高表面硬度,增强流体动压效应,改善织构在润滑油存储和捕捉磨粒的能力,进一步优化了润滑性能,因而,多层织构试样表现出较低的摩擦系数和磨损率,显著提升了球墨铸铁表面的摩擦学性能.

     

    Abstract: Ductile iron is widely used in high-load friction pairs such as engine crankshafts due to its good mechanical properties. However, in engineering applications, the failure of tribological properties is still inevitable. In this study, regular texture array, in-situ texture, and multi-layer texture were fabricated on the surface of ductile cast iron by laser processing technology. The micro-flow field simulation of the above texture array was carried out to study the influence of different texture types on the hydrodynamic lubrication effect of the friction pair surface. The tribological properties of different textured surfaces under oil lubrication conditions were tested and analyzed to explore the influence mechanism of these textures on the tribological behavior of the ductile cast iron surface. The results showed that the multi-layer texture could enhance the hydrodynamic pressure more effectively. The hydrodynamic pressure of regular array texture and in-situ texture with relative area densities of 9% and 16% increased by 14.7%, 21.1%, and 3.9%, respectively. Compared with the untextured samples, all three textured samples improved the wear resistance of the material, and the wear rate was reduced by more than 66%. The multi-layer texture combined the advantages of array texture and in-situ texture. By improving the surface hardness, enhancing the hydrodynamic effect, and improving the ability of the texture to store and capture abrasive particles in lubricating oil, the lubrication performance was further optimized. Therefore, the multi-layer texture samples showed lower friction coefficient and wear rate, which significantly improved the tribological properties of the ductile iron surface.

     

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