论文部分内容阅读
采用高温磨损试验机对TC11合金进行了400~600℃高温干滑动磨损试验,研究了TC11合金的高温磨损行为和耐磨性;并通过X射线衍射分析仪(XRD)、扫描电镜(SEM)以及能谱分析仪(EDS)对磨面和亚表层的物相、形貌和成分进行分析,并探讨了磨损机制。在400℃下随着载荷增加磨损率略有增加,超过200 N时磨损率出现快速提高;当温度进一步提高至500~600℃时,磨损率降到最低,且不随载荷增加而变化。分析表明,在400℃时,磨面上出现塑性变形和撕裂的痕迹以及沿滑动方向的犁沟,同时出现致密的黑色光滑区和剥落区,磨损机制为黏着磨损、磨粒磨损和氧化轻微磨损。而在500~600℃,磨损表面均为致密的黑色光滑区和剥落区,且600℃时的剥落区小于500℃时的,磨损机制为氧化轻微磨损。亚表层分析表明,在高温下磨损表面均形成一层摩擦氧化物层,在400℃时摩擦氧化物层厚度为5~8μm,而在500~600℃,摩擦氧化物层增加到10~15μm,且摩擦氧化物层的致密度随温度增加而提高。摩擦层显示出高的硬度,可达到HV1000以上,而且随着温度增加,显微硬度显著增加。
The high temperature wear resistance and wear resistance of TC11 alloy were investigated by high temperature wear tester at 400-600 ℃ for high temperature. The microstructure and mechanical properties of TC11 alloy were studied by XRD, SEM, Energy dispersive spectroscopy (EDS) was used to analyze the phase, morphology and composition of the surfacing and subsurface layers and the mechanism of wear was also discussed. At 400 ℃, the wear rate increases slightly with the increase of load. When the temperature exceeds 200 N, the wear rate increases rapidly. When the temperature is further increased to 500-600 ℃, the wear rate decreases to a minimum and does not change with the increase of load. The analysis shows that at 400 ℃, there are plastic deformation and tearing marks on the grinding surface and furrow along the sliding direction. At the same time, dense black smooth zone and spalling zone appear. The wear mechanism is adhesive wear, abrasive wear and slight oxidation Wear and tear At 500-600 ℃, the wear surfaces are dense black smooth area and exfoliation area. When the exfoliation area at 600 ℃ is less than 500 ℃, the wear mechanism is slight oxidation wear. Sub-surface analysis shows that the friction oxide layer is formed on the worn surface under high temperature, the thickness of friction oxide layer is 5 ~ 8μm at 400 ℃, while the friction oxide layer increases to 10 ~ 15μm at 500 ~ 600 ℃, And the density of the friction oxide layer increases with increasing temperature. Friction layer shows high hardness, can reach above HV1000, and as the temperature increases, the microhardness increases significantly.