变载荷对45钢摩擦副摩擦磨损性能的影响

针对实际工况中，45钢是在有润滑的状态下工作，且所受的载荷是变化的情况，课题组在自行改装的MMS-2A型多功能摩擦磨损试验机上采用环一块接触摩擦方式进行了实验，研究了在油润滑状态下变载荷对45钢摩擦副摩擦磨损性能的影响，与干摩擦条件下的磨损性能进行对比；并对45钢磨损表面进行了观察。结果表明：干摩擦和油润滑状态下的45钢摩擦副的摩擦因数呈现不同的变化趋势；油润滑条件下的磨损量比干摩擦条件下的磨损量要小很多；在油润滑条件下，45钢的磨损机理主要表现为磨粒磨损和疲劳剥落。研究验证了油润滑的存在有助于改善材料的耐磨性。

Friction and Wear Behaviors of 45 Steel Frictions Coupling under Vibration Load

ln the actual working conditions, the 45 steel is working under lubrication condition, and the load is changing. The friction and wear properties of the 45 steel coupling under alternative vibration load and lubrication condition was studied by using MMS-2A multifunction friction and wear testing machine with ring-on-block friction pairs,and its results were compared with those under dry condition. The worn surface of the 45 steel was observed by metallurgical microscope. The results showed that wear volume under dry condition was higher than that under lubrication condition; and the wear mechanisms of 45 steel were abrasive wear and fatigue spalling. It proved that oil lubrication could improve the wear resistance of the material.