表面纳米化中碳钢磨合磨损性能研究

为研究表面纳米化中碳钢在润滑条件下的磨合性能,用环-盘摩擦磨损试验机进行磨合磨损试验.分析在不同载荷下摩擦系数和摩擦振动信号多重分形谱参数的变化,通过磨损表面形貌探讨表面纳米化影响中碳钢磨损行为的原因.结果表明:在低、中负荷作用下,表面纳米化处理的中碳钢摩擦系数和振动信号多重分形谱参数较未处理的有所降低,其较高的表面活性可更好地吸附润滑油以形成油膜.因此,在低、中负荷条件下,表面纳米化可提高中碳钢磨合磨损性能.

Influence of surface nanocrystallization on running-in and wearing properties of medium carbon steel

In order to study how running-in affects surface nanocrystallization of medium carbon steel,running-in and wearing tests were conducted,while under lubrication,using a ring-on-disc tester.Variations in the coefficient of friction and multifractal spectrum parameters of frictional vibration signals were analyzed.Wearing behavior of the surface nanocrystallization of medium carbon steel was investigated by examining wearing surface topography.The results showed that the coefficient of friction and the multifractal spectrum parameters of frictional vibration signals are markedly decreased for specimens showing surface nanocrystallization.High surface activity leads to better adsorption of lubricant-on the condition that the load is below a critical value beyond which oil film formation is inhibited.Our test showed that running-in and wearing properties of medium carbon steel can be improved by means of surface nanocrystallization.