某塔筒螺栓断裂原因分析  

Fracture cause analysis of one tower bolt

作　　者：张德美 梁晓东 张焰 Zhang Demei;Liang Xiaodong;Zhang Yan(Chongqing Institute of Optics and Mechanics Co.,Ltd.,Chongqing 401122,China;Chongqing Chongke Physical and Chemical Test&Metrology Center Co.,Ltd.,Chongqing 400020,China)

机构地区：[1]重庆市光学机械研究所有限公司,重庆401122 [2]重庆市重科理化计量中心有限公司,重庆400020

出　　处：《金属热处理》2025年第2期312-315,共4页Heat Treatment of Metals

摘　　要：风电用塔筒螺栓在使用过程中发生断裂,采用金相检验、扫描电镜-能谱分析、化学成分检测、力学性能检测等对断裂螺栓进行断裂原因分析。结果表明,断裂螺栓化学成分、力学性能均符合标准要求,显微组织无异常。断裂螺栓头部与杆部连接处的R值偏小。断裂面起源部位有锌镍渗镀层加深的现象存在。这说明调质处理时,在淬火应力的作用下,螺栓头部和杆部交接处产生了裂纹;使用时,在力的作用下,裂纹不断扩展,最终导致疲劳断裂。One tower bolt used in one wind-power station was fractured.The fracture cause of the failed bolt was analyzed by means of metallographic examination,SEM-EDS analysis,chemical composition testing and mechanical property testing.The results show that chemical composition and mechanical properties all meet the requirements of national standard.There is no abnormality for the microstructure.But the R value at the connection between the head of the fractured bolt and the screw is too small.The depth of Zn-Ni plating near the crack source is deeper than other edges,which indicates that during quenching and tempering treatment,cracks are generated at the intersection of the bolt head and the screw under the action of quenching stress.When in use,under the action of force,cracks continue to propagate,ultimately leading to fatigue fracture.

关 键 词：塔筒螺栓 断裂分析 淬火裂纹 

分 类 号：TG115[金属学及工艺—物理冶金]