中碳钢/不锈钢磁场摩擦中磨屑的行为和作用

以45钢销/302不锈钢盘摩擦副为研究对象，采用自制的销、盘摩擦磨损试验机，研究了直流磁场作用下磨屑在摩擦过程中的行为及其对摩擦磨损性能的作用. 为此分析了有、无磁场作用下磨屑在磨损面上的分布特点，利用扫描电镜观察了磨屑及45钢销磨损面的形貌，采用三维形貌仪表征了磨损面特征区域的相对高度. 与无磁场时的摩擦磨损情况相比，磁场作用下45钢销的磨损量有所增大，而摩擦系数稍有减小. 摩擦过程中出现了302不锈钢盘向45钢销的材料转移并形成了不连续的转移层，该转移层相对高度较大，承担了主要的摩擦磨损并趋于平滑. 磁场作用下45钢销磨损面吸附少量磨屑并使之细化和氧化，该吸附磨屑在一定程度上减小了摩擦副的摩擦系数，并阻碍试样之间的材料转移，从而增加了45钢销的磨损量. 

Behaviors and Effect of the Wear Debris during Friction between Medium-Carbon Steel and Stainless Steel with the Magnetic Field

The behavior of wear debris and its effect on the tribological properties of 45 steel pin against 302 stainless steel disk under the magnetic field were investigated using the self-developed pin-disk tribometer. For this reason, the distribution characteristics of wear debris on the worn surface of specimen were analyzed with and without the magnetic field. The morphologies of the wear debris and worn surface of 45 steel pin were characterized by means of scanning electron microscopy. The relative height of various areas on the worn surface was characterized by using 3-D surface profiler. Compared with the case without the magnetic field, the wear of 45 steel pin specimen increased, whereas the friction coefficient of the couple was reduced with the magnetic field. In the process of friction, the material of 302 stainless steel disk was transferred onto the worn surface of 45 steel pin and the discontinuous transfer layer was observed. The transfer layer on the worn surface bore the vast majority of friction and wear and tended to be smooth. A small amount of wear debris was adsorbed on the worn surface of 45 steel pin and became fine and oxidized with the magnetic field. To a certain extent the wear debris adsorbed on the worn surface reduced the friction coefficient and hindered the material transfer between the tribo-couple and then increased the wear of 45 steel pin.