显微组织对4Cr5MoSiV1钢室温和高温耐磨性的影响

采用销盘式高温摩擦磨损试验机,对不同显微组织的4Cr5MoSiV1钢在25℃和400℃下进行了干磨损试验,研究了显微组织对其耐磨性的影响,并探讨了磨损机制。研究结果表明,4Cr5MoSiV1钢在室温下主要为粘着磨损,其耐磨性不仅取决于材料的硬度,还与其断裂抗力有关;400℃时的磨损为氧化磨损,但已超越了Quinn型氧化轻微磨损,其耐磨性取决于材料的硬度、韧性以及热稳定性。室温耐磨组织应具有高的硬度和一定的断裂抗力,而高温耐磨组织应具有高的硬度和热稳定性及一定的韧性。

Effect of microstructure on wear resistance of 4CrSMoSiV1 steel at room and elevated temperature

Dry wear tests were conducted on a pin-on-disc friction and wear tester for 4Cr5MoSiV1 steel with various microstructure in atmospheric environment at room temperature(25 ℃) and 400 ℃.The effects of microstructure on wear resistance of the steel were studied and wear mechanisms were analyzed.The results show that wear mechanism at 25 ℃ for 4Cr5MoSiV1 steel is adhesive wear.The wear resistance not only depends on hardness of the materials,but also is closely.related with its fracture resistance.The wear mechanism is oxidation wear at 400 ℃,but which is already beyond the mild Quinn type oxidation wear.The wear resistance is dominated by the hardness,toughness and thermal stability of materials.The wear-resistance microstructure at room temperature should have high hardness and a certain fracture resistance.While high thermal stability,high hardness,and a proper fracture toughness are essential to the wear-resistant microstructure at elevated temperature.