轮轴钢35CrMoA单轴微动疲劳失效机理  

Uniaxial frettingfatigue properties of 35CrMoA

作　　者：杨洋[1] 何国球[1] 卢棋 樊康乐[1] 佘萌 刘兵[1] 朱旻昊[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]西南交通大学牵引动力国家重点实验室,四川成都610031

出　　处：《金属功能材料》2015年第1期21-26,共6页Metallic Functional Materials

基　　金：牵引动力国家重点实验室开放课题资助项目(TPL1306)

摘　　要：通过平面对平面的接触方式,研究轮轴钢35CrMoA在单轴微动疲劳下的失效机理,采用扫描电子显微镜观察其微动损伤表面的微观形貌,通过透射电镜观察微动疲劳过程中不同应力幅值时接触区位错的组态。结果表明,随着应力幅值的增加,微动疲劳寿命降低的幅度变小;微动磨损可能加速微裂纹的萌生,也可能推迟微裂纹扩展;随着轴向应力幅值的增大,形成的位错胞尺寸也较大,并且其多边形化的趋势也越明显;微动疲劳的接触压应力和循环载荷为位错的滑移切变提供了条件。Uniaxial fretting fatigue properties of 35 CrMoA was investigated by the means of plane to plane contact.The microstructures were observed by canning electronic microscope（SEM）.Dislocation structure at the contact area was observed by transmission electron microscopy（TEM）.The results indicate that with the increase of stress amplitude,the fretting fatigue life is reduced,and the range is smaller.Fretting wear may accelerate microcrack initiation,and also may delay the microcrack propagation.With the increase of axial stress amplitude,the size of dislocation cell is bigger,and the trend of polygons is more obvious.Contact compressive stress and axial cyclic stress provides the conditions for dislocation slip shear.

关 键 词：35CrMoA 轮轴钢 微动疲劳 失效机理 

分 类 号：TG142.1[一般工业技术—材料科学与工程]