4Cr5MoSiV1和45钢耐磨性对比研究

Comparative Study on Wear Resistance of 4Cr5MoSiV1 and 45 Steel

采用销盘式高温摩擦磨损试验机,在25～400℃下对4Cr5MoSiV1和45钢进行磨损试验,对比两种钢的耐磨性,并探讨了磨损机制。研究表明:在25℃下为粘着磨损,4Cr5MoSiV1和45钢具有相同耐磨性,磨损率随载荷的提高呈线性增加,符合Archard公式;在200℃下为Quinn型氧化轻微磨损,4Cr5MoSiV1和45钢仍然具有相同的耐磨性;随载荷的提高,磨损率先降低后缓慢增加,具有较低的磨损率和增长率;在400℃下为氧化磨损,但不同于Quinn型氧化轻微磨损;随载荷的提高,磨损率快速增加,特别是高载荷下45钢出现塑性挤出,4Cr5MoSiV1钢具有比45钢明显高的耐磨性,归因于其高的热软化抗力。

The wear tests were performed for 4Cr5MoSiV1 and 45steel on a pin-on-disk high-temperature wear tester. The wear resistances were compared, and the wear mechanism was discussed. The results show that, at 25 ℃, adhesive wear prevail, 4Cr5MoSiV1 and 45 steels possess the same wear resistance. The wear rate linerally increases with the increase of load. This accords with Achard＇s formula. At 200 ℃, Quinn-type oxidative mild wear prevails. 4Cr5MoSiV1 and 45 steels share the same wear resistance as well. With the increase of load, the wear rate first decreases and then marginally increases, there are the lowest wear rate and increased rate. At 400 ~C, an oxidative wear prevails, which is different from Quinn-type oxidative mild wear. The wear rate rapidly increases with the increase of load. Especially, the plastic extrusion appears in 45 steel under a load of 150 N. 4Cr5MoSiV1 presents a higher wear resistance than 45 steel, because of the former＇s higher resistance to the thermal softening.