金属磁记忆信号评定磨损现象与磨损状态的基础实验

Fundamental Research on Evaluation of Wear Phenomena and Wear State by Metal Magnetic Memory Signals

采用40CrMo块试样与316L销试样组成销-块摩擦副,在干摩擦条件下进行摩擦磨损试验,研究整个摩擦磨损过程中磁记忆信号切向分量与试验表面磨损现象以及磨损状态之间的关系。试验结果表明:在摩擦磨损过程中,40CrMo试样表面磁记忆信号出现信号突变,并且突变后的信号可以准确地反应磨痕的长度与位置;整个摩擦磨损过程试样表面磨痕处磁记忆信号切向分量均值随摩擦次数的变化可以分为4个阶段,各个阶段间的转变点分别为点G、点H以及点I,并且通过现场观测、电镜扫描以及能谱分析发现磁记忆信号转变点处试样表面的磨损现象和磨损状态亦发生转变。

The 40CrMo block specimen and the 316L pin specimen which constituted a pin-on-block friction pair were used for the friction magnetic memory test in the geomagnetic field environment. The relationship between the tangential magnetic memory signals in the process of friction and wear phenomena and wear state was investigated.The results show that the magnetic memory signals of the 40CrMo block specimen appear a mutation in the process of friction.The mutation indicates the location and the width of the wear scar accurately.The average of the tangential magnetic memory signals is divided into four stages in the process of friction.The change points are point G,point H and point I.Through the field ob- servation, scanning electron microscope and spectrum analysis, the result shows that the wear phenomena and wear state are changed on the three change points when the magnetic memory signals are changed