400HBW级商用低合金耐磨钢的耐磨性能研究

Study on the Wear Resistance of 400HBW Grade Commercial Low Alloy Wear-resistant Steel

通过摩擦磨损实验,对两种400HBW级低合金马氏体耐磨钢27MnTiB和35CrMo进行耐磨性研究。结果表明:与35CrMo钢相比,27MnTiB钢的平均摩擦系数较小。此外,白光干涉仪测量显示27MnTiB钢的磨损轨迹较窄且较浅,27MnTiB钢的磨损体积和磨损率均小于35CrMo钢,展现出更好的耐磨性。扫描电镜观察发现两种样品磨痕形貌中均有犁沟和碎屑,35CrMo钢的磨痕中存在分层,说明发生疲劳磨损。同时讨论磨损机理,并分析影响耐磨性的因素。

The wear resistance of 400HBW grade low alloy martensitic wear-resistant steels 27MnTiB and 35CrMo is investigated by friction and wear experiments.The results show that compared with 35CrMo steel,the average friction coefficient of 27MnTiB steel is smaller.In addition,the white light interferometer measurements show that the wear trajectory of 27MnTiB steel is narrow and shallow,and the wear volume and wear rate of 27MnTiB steel are less than those of 35CrMo steel,demonstrating better wear resistance.Scanning electron microscopy observations reveal plough furrows and debris in the wear scar morphology of both samples,and delamination is found in the wear scar morphology of 35CrMo steel,indicating that fatigue wear occurred.The wear mechanism is discussed and the factors affecting the wear resistance are analyzed.