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采用销盘摩擦磨损试验机研究了不同载荷下45钢与DC53钢(Cr12Mo V1)的干滑动摩擦学行为。通过SEM、XRD、SIMS等分析了45钢的磨损机理及其摩擦诱发的变形层特征。结果表明,载荷从40 N增加到60 N时,45钢销试样的磨损率增加量远大于DC53钢盘试样的磨损率增加量,载荷的变化对平均摩擦系数的大小几乎无影响;40 N载荷条件下,45钢销试样表面主要发生磨粒磨损和轻微的粘着磨损,60 N载荷条件下,45钢销试样表面主要发生粘着磨损;45钢销试样的摩擦影响层均由摩擦表层和塑性变形层组成,60 N载荷条件下销试样的塑性变形层深度大于40 N载荷条件下的销试样;45钢销试样的磨损表层出现了晶粒细化的现象,60 N载荷条件下的晶粒细化更明显;磨损表层中的细晶铁素体主要是由摩擦磨损过程中摩擦热和塑性变形共同作用导致的动态再结晶诱发的。
The dry sliding tribological behavior of 45 steel and DC53 steel (Cr12Mo V1) under different loads was investigated by pin-plate friction and wear tester. The wear mechanism of 45 steel and its friction-induced deformation layer characteristics were analyzed by SEM, XRD and SIMS. The results show that when the load increases from 40 N to 60 N, the wear rate of the 45 steel pin specimen is much larger than that of the DC53 steel disk specimen. The change of the load has little effect on the average friction coefficient. 40 N load conditions, 45 steel pin specimen surface wear mainly abrasive wear and slight wear and tear, 60 N load conditions, 45 steel pin specimen surface adhesion occurs mainly wear; 45 steel pin specimen friction affected layer by Friction surface layer and plastic deformation layer composition, the plastic deformation layer depth of the pin specimen under 60 N load is larger than that of the pin specimen under the load of 40 N; the wear surface layer of the 45 steel pin specimen shows the phenomenon of grain refinement, The grain refinement under N loading is more obvious. The fine grained ferrite in the worn surface is mainly induced by the dynamic recrystallization caused by the frictional heat and plastic deformation in the process of friction and wear.