摘要
采用纯滚动和滚动加滑动接触方式进行干摩擦磨损,研究U75V钢磨损后组织和性能变化规律.结果表明,U75V钢试样经纯滚和滚滑磨损后,表面至心部出现硬度梯度分布,距离表面越近,硬化程度越高.纯滚动状态下硬度梯度比较大,表面平均硬度较高,滚滑状态下硬度梯度较小,表面平均硬度较低.随着距表面距离减小,变形组织逐渐纤维化,纤维方向逐渐平行于试样表面.在表面附近,珠光体出现片层断裂、碎化、细化.纯滚状态下磨损机制为表面微观疲劳磨损,滚滑状态下磨损机制为表面微观疲劳磨损和少量黏着磨损.
Microstructure and properties of U 7 5 Y steel worn by rolling and rolling-sliding contact dry frictionrespectively were investigated. A surface hardness gradient distribution existed from the surface to the core ofworn U 7 5 Y steel samples. The closer to the surface, the higher degree of hardening is. The hardness gradientis relatively larger, and the surface hardness is higher under the rolling contact, while the hardness gradient isrelatively smaller and the surface hardness is lower under the rolling-sliding contact. The deformed microstructureis gradually evolved to the fibers, and their directions are gradually parallel to the surface with decreaseddistance to the surface. Nearing to the surface, the lamellae of the pearlite are fractured, fragmented and refined.The worn mechanism of rolling contact is the surface microscopic fatigue, and that of rolling-slidingcontact is the surface microscopic fatigue with little adhesive wear.
出处
《大连交通大学学报》
CAS
2016年第4期100-104,共5页
Journal of Dalian Jiaotong University
基金
国家973计划资助项目(2015CB654802)
关键词
U75V钢
滚滑
磨损
组织
U 7 5 V steel
rolling-sliding
wear
microstructure