摘要
在空气、氧气和氮气气氛中,研究了LZ50车轴钢在法向载荷为50 N和不同角位移幅值下的扭动微动运行行为,并重点分析了其摩擦磨损特性和氧化作用机理.结果表明,当气氛中含氧量增加时,混合区和滑移区向小角位移幅值方向移动,摩擦扭矩随循环周次的变化曲线分别为跑合、上升和稳定阶段,当气氛中含氧量增加时,上升阶段缩短,稳定阶段提前,摩擦扭矩值则越低.在部分滑移区,损伤比较轻微,在混合区和滑移区,扭动微动磨损机制为磨粒磨损和剥层,并伴随明显的塑性变形.摩擦氧化在扭动微动接触界面不仅增加了界面滑移,而且产生的氧化磨屑不易排出接触区,因此有利于减少磨损.
On an atmosphere-controlled torsional fretting tester, torsional fretting running behaviors of LZ50 steel is investigated in three atmospheres （ambient air, oxygen and nitrogen）. The results indicates that the mixed fretting regime and slip regime shift towards the smaller angular displacement amplitude with the increasing oxygen content in the atmospheres. The variation curves of friction torques as function of the number of cycles are defined during initial, climbing and stable stages. With the increasing oxygen content in the atmospheres, the climbing stage is shortened, the stable stage arises in advance, and the friction torques are reduced. The friction torques and wear depths increase with the increasing angular displacement amplitude accordingly. In the partial slip regime, the damage gets slighter. The wear mechanism of torsional fretting here is shown as abrasive wear and delamination accompanied with the plastic deformation in the mixed fretting and slip regimes. The interface slip is enhanced, the oxidative debris becomes difficult to remove, hence the wear is reduced due to the tribo-oxidation.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2009年第9期86-90,共5页
Journal of Xi'an Jiaotong University
基金
国家"973计划"资助项目(2007CB714704)
国家自然科学基金资助项目(50821063
50775192)
西南交通大学创新团队培育计划资助项目(2007IRT01)
关键词
摩擦磨损
微动磨损
扭动微动
摩擦氧化
friction and wear
fretting wear
torsional fretting
tribo-oxidation
