ISSN   1004-0595

CN  62-1224/O4

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龙有红, 任岩平, 何添, 李洪洋, 彭金方, 朱旻昊. 31CrMoV9钢离子渗氮层的微动摩擦磨损特性研究[J]. 摩擦学学报(中英文), 2024, 44(5): 1−11. doi: 10.16078/j.tribology.2023152
引用本文: 龙有红, 任岩平, 何添, 李洪洋, 彭金方, 朱旻昊. 31CrMoV9钢离子渗氮层的微动摩擦磨损特性研究[J]. 摩擦学学报(中英文), 2024, 44(5): 1−11. doi: 10.16078/j.tribology.2023152
LONG Youhong, REN Yanping, HE Tian, LI Hongyang, PENG Jinfang, ZHU Minhao. Study on Fretting Wear Behaviour of Plasma Nitriding Layer of 31CrMoV9 Steel[J]. Tribology, 2024, 44(5): 1−11. doi: 10.16078/j.tribology.2023152
Citation: LONG Youhong, REN Yanping, HE Tian, LI Hongyang, PENG Jinfang, ZHU Minhao. Study on Fretting Wear Behaviour of Plasma Nitriding Layer of 31CrMoV9 Steel[J]. Tribology, 2024, 44(5): 1−11. doi: 10.16078/j.tribology.2023152

31CrMoV9钢离子渗氮层的微动摩擦磨损特性研究

Study on Fretting Wear Behaviour of Plasma Nitriding Layer of 31CrMoV9 Steel

  • 摘要: 针对31CrMoV9钢基体及其渗氮层,采用切向微动磨损试验机开展球/平面接触模式下的切向微动磨损试验. 探究了在法向载荷为20 N时,不同位移幅值下(D=5、10、50 μm)的切向微动损伤机制和损伤演变规律. 采用X射线衍射仪(XRD)对试样表层物相进行分析,扫描电子显微镜(SEM)和白光干涉仪对试样磨损区进行形貌表征,能谱仪(EDS)和电子探针显微分析仪(EPMA)进行化学元素分析. 结果表明:离子渗氮处理后在基体表面形成了化合物层和扩散层,显著提高了表面硬度. 在法向载荷Fn=20 N时,随着微动位移幅值的增大,31CrMoV9基体及其渗氮层的微动运行区均由部分滑移区逐渐向混合、完全滑移区转变,磨损体积增大,磨损更加严重,稳定阶段的摩擦系数逐渐增大. 在部分滑移区和完全滑移区,渗氮层较基体在稳定阶段的摩擦系数更小,而在混合区基体的摩擦系数更小. 在混合区和完全滑移区时,基体及渗氮层的损伤机制均为剥层、磨粒磨损和氧化磨损. 离子渗氮生成的化合物层能提高材料的抗微动磨损性能,在D=10和50 μm时,磨损率分别降低了约38.5%和70.2%. 研究结果可为轨道交通等领域结构件的选材和抗微动磨损设计提供参考.

     

    Abstract: Fretting wear widely exists in railway transportation. Surface treatment technology has a significant effect on enhancing the safety and reliability of locomotive operation by improving the surface wear properties of its components. A compound layer was produced on the surface of 31CrMoV9 steel sample via plasma nitriding. A tangential fretting wear test was conducted on 31CrMoV9 steel and its nitrided layer utilizing a highly accurate fretting tester in ball/flat contact mode. The fretting mechanism and damage evolution of the samples were investigated at different displacement amplitudes (D=5, 10, 50 μm) with a normal load of 20 N. In order to identify the resulting phases such as ferrite phase and combination phase, X-ray diffractometer (XRD) was conducted to examine the surface layer of distinctive samples. Morphology of the worn area was characterized by scanning electron microscopy (SEM) and white light interferometer. The chemical elements were analyzed by energy dispersive spectroscopy (EDS) and electron probe microanalyzer (EPMA). The results demonstrated that after plasma nitriding treatment, the nitrided sample developed a compound layer, diffusion layer and substrate in the direction of depth, resulting in a significant enhancement of the surface hardness. The near-surface hardness of nitrided layer was approximately 560.7 HV0.3, which was an increase of 112.7% compared to the substrate’s near-surface hardness of approximately 263.6 HV0.3, and the depth of nitriding influence layer was approximately 1.5 mm. As the fretting displacement amplitude gradually increased at Fn=20 N, the fretting regime of 31CrMoV9 substrate and nitrided layer changed from partial slip regime to mixed regime, slip regime, ultimately leading to an increase in the wear volume and the friction coefficient during the stabilization period. The friction coefficient of the substrate was smaller compared with the nitrided layer in the mixed regime, which was opposite to the partial slip regime and slip regime, the observed difference was attributed to the substrate sample formed a thicker debris layer than the nitrided sample in the mixed regime, which played a lubricated role. The wear mechanism of the substrate and nitrided layer were delamination, abrasive wear and oxidation wear in the mixed regime and slip regime. The compound layer generated by plasma nitriding improved the fretting wear resistance of the material, and the volume wear rate reduced by about 38.5% (D=10 μm) and 70.2% (D=50 μm). The research results provided a reference for the material selection of structural components and designing anti-fretting wear measures in the railway transportation industry and other fields.

     

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