孙日文,赵泽翔,刘志兰,张伟,高龙飞,赵阳,赵伟.38CrMoAl/QT600-3摩擦副摩擦磨损行为研究[J].表面技术,2023,52(2):254-262.
SUN Ri-wen,ZHAO Ze-xiang,LIU Zhi-lan,ZHANG Wei,GAO Long-fei,ZHAO Yang,ZHAO Wei.Friction and Wear Behavior of the Friction Pair 38CrMoAl/QT600-3[J].Surface Technology,2023,52(2):254-262 |
| 38CrMoAl/QT600-3摩擦副摩擦磨损行为研究 |
| Friction and Wear Behavior of the Friction Pair 38CrMoAl/QT600-3 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.02.023 |
| 中文关键词: 38CrMoAl/QT600-3 氮化 磨损机理 白亮层 扩散层 硬度 韧性 |
| 英文关键词:38CrMoAl/QT600-3 nitriding wear mechanism white layer diffusion layer hardness toughness |
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| Author | Institution |
| SUN Ri-wen | Himile Mechanical Science and Technology Shandong Co., Ltd., Shandong Gaomi 261500, China;Shandong Provincial Key Laboratory of Core Tire Mold Technology, Shandong Gaomi 261500, China |
| ZHAO Ze-xiang | Himile Mechanical Science and Technology Shandong Co., Ltd., Shandong Gaomi 261500, China;Shandong Provincial Key Laboratory of Core Tire Mold Technology, Shandong Gaomi 261500, China |
| LIU Zhi-lan | Himile Mechanical Science and Technology Shandong Co., Ltd., Shandong Gaomi 261500, China;Shandong Provincial Key Laboratory of Core Tire Mold Technology, Shandong Gaomi 261500, China |
| ZHANG Wei | Himile Mechanical Science and Technology Shandong Co., Ltd., Shandong Gaomi 261500, China;Shandong Provincial Key Laboratory of Core Tire Mold Technology, Shandong Gaomi 261500, China |
| GAO Long-fei | Himile Mechanical Science and Technology Shandong Co., Ltd., Shandong Gaomi 261500, China;Shandong Provincial Key Laboratory of Core Tire Mold Technology, Shandong Gaomi 261500, China |
| ZHAO Yang | Himile Mechanical Science and Technology Shandong Co., Ltd., Shandong Gaomi 261500, China;Shandong Provincial Key Laboratory of Core Tire Mold Technology, Shandong Gaomi 261500, China |
| ZHAO Wei | Himile Mechanical Science and Technology Shandong Co., Ltd., Shandong Gaomi 261500, China;Shandong Provincial Key Laboratory of Core Tire Mold Technology, Shandong Gaomi 261500, China |
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| 中文摘要: |
| 目的 研究实际工况下氮化处理的38CrMoAl/QT600-3摩擦副的磨损机理，为提高摩擦副的服役寿命提供指导。方法 模拟实际工况，采用往复式摩擦磨损试验机进行摩擦磨损试验，结合显微维氏硬度计、金相显微镜、XRD分析摩擦副氮化处理后的硬度和组织，借助LSCM、SEM分析其磨损形貌，使用EDS分析其磨损表面化学成分。结果 氮化处理后，38CrMoAl白亮层厚度为26 μm，主要由ε相、γ′相组成，表面硬度平均为1 112.8HV0.3，扩散层主要是α相，硬度呈梯度下降，即使白亮层磨损，扩散层依然具有较高的硬度;QT600-3白亮层厚度为16 μm，主要由ε相、γ′相和石墨组成，表面硬度平均为960.4HV0.3，扩散层由α相和石墨组成，白亮层磨损后，扩散层硬度急剧下降，接近基体硬度。本试验条件下，38CrMoAl/QT600-3摩擦副磨损过程分3个阶段，即38CrMoAl白亮层对磨QT600-3白亮层、38CrMoAl白亮层对磨QT600-3扩散层、38CrMoAl扩散层对磨QT600-3扩散层，前2个阶段摩擦因数曲线稳定，摩擦因数介于0.5~0.6之间，磨损机理主要以磨粒磨损和疲劳磨损为主，其中第2阶段发生了氧化磨损，第3个阶段以黏着磨损和氧化磨损为主，此阶段摩擦副出现严重的擦伤、胶合，导致摩擦因数曲线噪音较大。结论 提高白亮层的硬度、韧性以及厚度，可以增加摩擦副的服役寿命。 |
| 英文摘要: |
| In order to provide theoretical guidance and reference for service life extension, the wear mechanism of 38CrMoAl/QT600-3 friction pair which was prepared by nitriding treatment under actual working conditions was studied in this paper. The wear test was carried out by means of the recipsrocating frication tester under the simulated working conditions in which the temperature was 180 ℃, the load was 10 MPa and the sliding speed was 20 mm/s, and all the experiments were conducted under the dry friction condition. The wear loss was measured from the thickness change of the samples before and after friction experiment. The thickness, hardness, microstructure and phase transformation of the friction pair were analyzed by digital micrometer, micro Vickers hardness tester, optical microscope (OM) and X-ray diffractometer (XRD), respectively. The surface morphology and composition of counterfaces were investigated by laser scanning confocal microscope (LSCM), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). The experimental results showed that, after nitriding, the thickness of 38CrMoAl white layer composed of ε phase and γ′ phase was about 26 μm, and its average surface hardness was 1 112.8HV0.3. The diffusion layer of 38CrMoAl was composed of α phase and its hardness decreased in gradient. Even though the 38CrMoAl white layer was worn away during friction, the diffusion layer can still retain the high hardness. The white layer of QT600-3 was composed of ε phase, γ′ phase and graphite phase. The thickness and average surface hardness of QT600-3 white layer were 16 μm, 960.4HV0.3 respectively. After QT600-3 white layer was worn away, the hardness of diffusion layer which was composed of α phase and graphite phase rapidly decreased to the level of matrix. The results of wear test showed that, under the current experimental conditions, the wear process of 38CrMoAl/QT600-3 friction pair could be divided into three stages, 38CrMoAl white layer grinding with QT600-3 white layer, 38CrMoAl white layer grinding with QT600-3 diffusion layer and 38CrMoAl diffusion layer grinding with QT600-3 diffusion layer. In the first two stages, the friction coefficient curve was stable, and the friction coefficient was between 0.5 and 0.6. The wear mechanism of the first two stages was mainly abrasive wear and fatigue wear, and oxidation wear was observed in the second stage. In the third stage, the main wear mechanism was proved as heavy adhesive wear and typical oxidation wear. Serious scratches and gluing occurred on the friction pair in this stage, resulting in large oscillation of the friction coefficient curve. Based on the experimental results, the postponement of the third stage was particularly crucial since the service life of 38CrMoAl/QT600-3 friction pair mainly depended on the number of friction in the first and second stages. It was demonstrated that the increase of the hardness and toughness of the white layer can effectively improve the wear resistance and friction reduction during abrasive wear and fatigue wear. Furthermore, the improvement in the thickness of the white layer can significantly increase the friction times. Therefore, the service life of 38CrMoAl/QT600-3 friction pair can be extended by the enhancement in the hardness, toughness and thickness of the white layer. |
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