低温离子氮碳共渗温度对AerMet100钢摩擦学性能的影响

研究了不同温度对AerMet100钢渗氮层和氮碳共渗层的显微组织、表面硬度、渗层截面硬度梯度以及耐磨性的影响,并考察了渗层的磨损机理。结果表明,氮碳共渗层相较于渗氮层表面生成的化合物更加细小,表面更加平整光滑;离子渗氮、离子氮碳共渗处理都可显著提高AerMet100钢的表面硬度;随着温度的增加,共渗层厚度也明显增加;氮碳共渗层比渗氮层具有更低的摩擦因数,在共渗温度为480 ℃时氮碳共渗试样具有最低摩擦因数和磨损率,表现出最佳的耐磨性。渗氮层的磨损机理为氧化磨损和表面疲劳磨损,氮碳共渗层的磨损机理为氧化磨损、磨粒磨损以及表面疲劳磨损。

Effect of nitrocarburing temperature on tribological properties of AerMet100 steel after low temperature ion nitrocarburing

Effect of temperature on microstructure, surface hardness, cross-section hardness gradient and wear resistance of the nitrided layer and nitrocarburized layer of the AerMet100 steel by low-temperature ion nitriding and low-temperature ion nitrocarburizing was studied, and the wear mechanism of the infiltrated layer was also discussed. The results show that the compound formed on the nitrocarburized layer is smaller compared to the nitrided layer and its surface is more even and smoother. Both ion nitriding and ion nitrocarburizing treatments can significantly increase the surface hardness of AerMet100 steel. It is found that the thickness of the nitrocarburized layer also increases with the increase of temperature. The nitrocarburized layer has a lower friction coefficient than the nitrided layer. The specimen exhibits the lowest friction coefficient and wear rate when the nitrocarburizing temperature is 480 ℃, and shows excellent wear resistance. The wear mechanism of the nitrided layer is oxidative wear and surface fatigue wear, and that of the nitrocarburized layer is oxidative wear, abrasive wear and surface fatigue wear.