预腐蚀与预疲劳对30CrMnSiA螺栓钢微动疲劳行为的影响  

Influence of Pre-corrosion and Pre-fatigue on Fretting Fatigue Behavior of 30CrMnSiA Bolt Steel

作　　者：杨廷勇 罗伟[1] 冯利军[2] 赵伟东 刘道新[4] 邓文[1] 张超 YANG Tingyong;LUO Wei;FENG Lijun;ZHAO Weidong;LIU Daoxin;DENG Wen;ZHANG Chao(China Helicopter Research and Development Institute,Jingdezhen 333001,Jiangxi,China;Southwest Technology and Engineering Research Institute,Chongqing 400039,China;College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;School of Civil Aviation,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]中国直升机设计研究所,江西景德镇333001 [2]西南技术工程研究所,重庆400039 [3]太原理工大学机械与运载工程学院,太原030024 [4]西北工业大学民航学院,西安710072

出　　处：《材料导报》2024年第23期212-218,共7页Materials Reports

基　　金：国家自然科学基金(52271071)。

摘　　要：为探究30CrMnSiA高强度螺栓钢在海洋环境服役工况下的微动疲劳行为,采用扫描电子显微镜、能谱仪、电化学阻抗谱等分析手段研究了预腐蚀、预疲劳以及两者联合作用对30CrMnSiA高强钢微动疲劳损伤行为的影响规律及机制。结果表明:本实验条件下30CrMnSiA螺栓钢损伤模式为微动疲劳;随着预腐蚀时间的延长,30CrMnSiA螺栓钢的微动疲劳寿命逐渐降低,预腐蚀6 d后螺栓的平均微动疲劳寿命降低了73.69%。在相同预腐蚀实验条件下,随着预疲劳循环次数的增加,螺栓的微动疲劳寿命逐渐降低;然而“预疲劳1万次+预腐蚀2 d”螺栓的微动疲劳寿命却稍高于单纯预腐蚀2 d的螺栓。预疲劳循环次数愈多和预腐蚀时间越长,螺栓的微动疲劳寿命则越短。预疲劳4万次循环后再腐蚀4 d的螺栓疲劳寿命降低了86.4%。原因是预腐蚀及其与预疲劳联合作用通常会促进30CrMnSiA螺栓钢表面疲劳裂纹的萌生和扩展,进而导致其微动疲劳寿命降低,但当预疲劳周次较少时,微动磨损较轻,且对螺栓表面有一定的整平作用,由此缓解了腐蚀的不利影响,使得螺栓的微动疲劳寿命反而比单纯预腐蚀螺栓的寿命稍长。To investigate the fretting fatigue behavior of 30CrMnSiA high-strength bolt steel under marine environmental service conditions,the influence and mechanism of pre-corrosion,pre-fatigue,and their combined effects on the fatigue damage behavior of 30CrMnSiA high-strength steel were studied by using analysis methods such as scanning electron microscopy,energy dispersive spectroscopy,electrochemical impedance spectroscopy.The results showed that,under the experimental conditions here,the damage mode of 30CrMnSiA high-strength bolt steel is fretting fatigue.With the increase of pre-corrosion time,the fretting fatigue life of 30CrMnSiA high-strength bolt steel gradually decreased,and the average fretting fatigue life of bolts decreased by 73.69%after 6 days pre-corrosion.Under the same pre-corrosion experimental conditions,as the number of pre-fatigue cycles increased,the fretting fatigue life of bolts gradually decreased;however,the fretting fatigue life of bolts with 10000 pre-fatigue cycles and 2 days of pre-corrosion is a little higher than that of bolts with only 2 days of pre-corrosion.The more pre-fatigue cycles and the longer the pre-corrosion time,the bolt had shorter fretting fatigue life.After 40000 cycles of pre-fatigue and 4 days of corrosion,the fatigue life of bolts decreased by 86.4%.The reason was that pre-corrosion and its combined effect with pre-fatigue usually promoted the initiation and propagation of fatigue cracks on the surface of 30CrMnSiA high-strength bolt steel,which led to a reduction of their fretting fatigue life.Ho-wever,when the pre-fatigue cycle was small,micro wear was lighter and had a certain leveling effect on the bolt surface,thereby alleviated the adverse effects of corrosion.As a result,the fretting fatigue life of bolts is slightly longer than that of simply pre-corrosion bolts.

关 键 词：30CrMnSiA螺栓钢 腐蚀 微动疲劳 电化学 

分 类 号：TB301[一般工业技术—材料科学与工程]