方形和菱形路径下35CrMoA拉扭复合微动疲劳行为  

The fretting fatigue behavior of 35CrMoA under square and diamond paths

作　　者：田丹丹[1] 何国球[1] 沈月[1] 刘晓山[1] 吕世泉 林国斌[2] 任敬东[2] 胡杰[2] 

机构地区：[1]同济大学材料科学与工程学院,上海市金属功能材料开发应用重点实验室,上海201804 [2]同济大学磁浮交通工程技术研究中心,上海201804

出　　处：《功能材料》2016年第5期78-83,共6页Journal of Functional Materials

基　　金：“十二五”国家科技支撑计划资助项目(2013BAG19B01)

摘　　要：研究了35CrMoA合金钢在接触应力为150 MPa,等效应力幅值为400 MPa时方形和菱形路径下的微动疲劳特性,包括循环应力响应特征、疲劳寿命、微动斑及微动疲劳断口的形貌特征。结果表明,方形路径下,35CrMoA钢经缓慢循环软化、快速软化到达最后的稳定阶段,而菱形加载下,材料快速软化之后直接到达稳定阶段;两种路径下的疲劳寿命差别不大;方形加载的滑移区较宽,粘着区较窄,而菱形加载则相反;方形路径下裂纹垂直于试样表面扩展,而菱形加载路径下的微裂纹是曲折的,沿与轴线成一定角度的方向上扩展。In this paper, the fretting fatigue behavior of 35CrMoA was studied at 150 MPa contact stress and400 MPa equivalent stress amplitude under square and diamond paths. This included cycle stress response char-acters, fatigue life, morphological characteristics of fretting spot and the failure fracture. The result shows： un-der square path, 35CrMoA reached the stage of stability through slow and rapid softening, while under diamondpath, it reached the final stage only through rapid softening; The fatigue life have little difference under thosetwo paths; Under square path, the slip region is wide, and the stick region is relatively narrow, but oppositeunder diamond path; The crack extension perpendicular to the sample surface under square path, but for dia-mond path, the micro crack is tortuous, and extension to a certain angle with axis.

关 键 词：35CrMoA合金钢 加载路径 微动疲劳 微动斑 断口形貌 

分 类 号：TG146.21[一般工业技术—材料科学与工程]