磨面温度对45钢磨损氧化层及磨损机制的影响

Effect of Wear Surface Temperature on Frictional Oxide Layer and Wear Mechanism of 45 Steel

采用MG-2000高温磨损试验机对45钢进行了干摩擦条件下的磨损试验,研究了该钢的摩擦磨损行为及磨损机制。结果表明:氧化层在磨损中起到决定性作用;氧化层的形成使得材料磨损率降低,磨损机理从粘着磨损转变为氧化轻微磨损;随环境温度和载荷增加,摩擦表面闪温升高,有利于氧化层的形成;氧化层的形成又促使闪温进一步升高,材料塑性变形及热软化加剧,磨损表面氧化膜剥落,磨损率快速提高,最终由轻微磨损转变为严重磨损。

The dry sliding wear tests were preformed for 45 steel on pin-on-disk wear tester. The friction and wear behavior and wear mechanism of the steel under different conditions were studied. The results show that the oxide layer is found to play a decisive role in the wear of the steeL After oxide layer formed, the wear rate decreases and the wear mechanism changes from adhesive wear to oxidative-mild wear. With the increase in the load and ambient temperate, the flash temperature increases, which can contribute to the formation of the oxide layer. Conversely, the existence of oxide layer facilitates the rise of the flash temperature, which can aggravate the plastic deformation and heat softening. As a result, the oxide layer delaminates and the wear rate improves obviously, which bring about a transformation from mild wear into severe wear.