激光熔凝层组织与摩擦学特性的研究
Investigation on microstructures and tribological characteristic of laser remelting layers
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摘要: 为研究激光熔凝层的磨损性能，在灰铸铁材料表面进行激光熔凝。以激光熔凝强化的灰铸铁为上试样，灰铸铁为下试样，模拟活塞环、缸套工作环境，进行标准的SRV快速磨损试验。利用表面形貌仪测量配副双方的磨损深度，扫描电子显微镜观察熔凝层、磨痕形貌。结果表明：激光熔凝层显微组织为先共晶奥氏体分布在共晶基底上的亚共晶，显微硬度变化范围在HV0.2 800～HV0.2 1 200之间。上、下试样磨损深度分别为2.04 mｍ和1.35 mｍ，摩擦系数在0.072 8～0.082 2范围内变化，磨损机制为磨粒磨损。Abstract: In order to investigate the tribological performance of laser remelting layers, laser remelting processes were carried out on grey cast iron matrix. The microstructures consist typical γ austenite dendrite distributed on the eutectic substrate and the microhardness varies from HV0.2 800 to HV0.2 1 200. The optimal SRV tests were carried out using laser remelting layers as upper samples and grey cast irons as low samples. The morphologies of worn scars were observed with scanning electron microscopy (SEM). The SRV tests show that the laser remelting processes reduce the wear losses of wear couple and lower the friction coefficient (0.072 8～0.082 2). The wear mechanism is abrasive wear.
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Key words:
- laser remelting /
- friction coefficient /
- wear mechanism /
- abrasive wear
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