摘要
通过对失效动载滑动轴承气蚀磨损的宏观特征分析和SEM研究发现,动载轴承气蚀失效有2种独特形貌.对合金层为3层结构的轴承气蚀失效机理进行了分析并解释了疲劳裂纹通过由不同材料构成的3层结构的变化.具有3层结构材料的合金层与单一合金层相比具有不同的裂纹生长方式,尤其是在2种材料的分界面处.分析表明:裂纹首先自摩擦层表面向里发展,当裂纹不断扩展到达摩擦层与镍栅层的结合面附近时,由于结合面的屏蔽效应转向沿与结合面平行方向扩展;除了相界裂纹,承载层中还存在第二相裂纹.图4,参10.
Based on macro-observation and micro-SEM analysis of dynamically loaded journal bearings two special surface appearance of cavitation erosion was revealed.The aim of the analysis was to explain the cavitation erosion failure mechanism as a fatigue crack propagates through the tri-layered structure of a bearing.Tri-layered components have been observed to exhibit different crack growth behaviour compared with monolithic construction,especially when it approaches a bi-material interface.A crack initiates from the surface firstly,then propagates in the direction parallel to the interface owing to its shielding effect as it approaches the interface between lining layer and nickel layer.Besides the interface among phases,the crack is prone to form in the secondary phases.4figs.,1tabs.,10refs.
出处
《湘潭矿业学院学报》
2004年第1期39-42,共4页
Journal of Xiangtan Mining Institute
基金
国家教育部"跨世纪优秀人才计划"基金资助项目
中科院兰州化学物理研究所固体润滑国家重点实验室开放基金资助项目.
关键词
三层结构合金层
动栽滑动轴承
气蚀
表面形貌
裂纹
tri-layered alloy
journal bearings
cavitation erosion
surface appearance
cracks
