CL60钢拉扭微动疲劳行为及断裂研究  

RESEARCH ON TENSION-TORSIONAL FRETTING FATIGUE BEHAVIOR AND FRACTURE MECHANISM OF CL60 STEEL

作　　者：向学渊[1] 何国求[1] 刘兵[1] 胡正飞[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200092 [2]西南交通大学牵引动力国家重点实验室

出　　处：《上海金属》2009年第5期24-27,共4页Shanghai Metals

基　　金：国家973计划资助项目(2007CB714700#);教育部"新世纪优秀人才计划"(NCET-05-0388)

摘　　要：在改进的微动试验装置上,实现了拉扭微动的复合。比较了不同应力幅值对CL60钢拉扭复合微动疲劳寿命的影响,利用扫描电镜分析了微动疲劳裂纹的萌生和扩展机制。结果表明:随着循环应力幅升高,拉扭微动疲劳寿命降低;在各个应力幅值下,试样总体上显示出循环软化的特征。疲劳裂纹萌生在微动区和未微动区的交界处,主裂纹聚合附近的一些微裂纹最后形成一条宏观裂纹扩展,导致试样断裂。The combination of tension - torsional fretting was realized on a modified fretting tester. The effects of different stress amplitudes on the fretting fatigue life of CL60 steel were compared. The fretting fatigue crack initiation and propagation mechanism were analyzed by SEM. The result showed that the tension - torsional fretting fatigue life decreased with the increasing of cyclic stress amplitude. The sample generally displayed cyclic softening behavior under each stress amplitude. The fretting fatigue cracks were initiated near the interface region of fretting and non - fretting. The macro crack which was formed by a main crack and several micro cracks propagated and led to sample fracture.

关 键 词：CL60钢 拉扭微动疲劳 疲劳寿命 应力幅值 

分 类 号：TG146.23[一般工业技术—材料科学与工程] O346.1[金属学及工艺—金属材料]