低温环境下TB8钛合金螺栓拉-拉疲劳性能研究  

Study on tensile fatigue properties of TB8 titanium alloy bolt at low temperature

作　　者：孙晓军 石大鹏 柯书忠 李少龙 郑鹏辉 张亚龙 SUN Xiaojun;SHI Dapeng;KE Shuzhong;LI Shaolong;ZHENG Penghui;ZHANG Yalong(Henan Provincial Key Laboratory of Fastening Technology,Xinyang 464000,CHN;School of Mechanical Engineering,Zhengzhou University of Aeronautics,Zhengzhou 450046,CHN)

机构地区：[1]河南省紧固连接技术重点实验室,河南信阳464000 [2]郑州航空工业管理学院机械工程学院,河南郑州450046

出　　处：《制造技术与机床》2025年第1期128-132,共5页Manufacturing Technology & Machine Tool

基　　金：河南省重点研发项目(231111221800);中国博士后科学基金项目(2022M712920);河南省紧固连接技术重点实验室开放课题项目(JGLJ2301)。

摘　　要：为量化某型机用新型TB8钛合金螺栓服役寿命,以典型规格螺栓样件为目标对象,分析了TB8钛合金螺栓的金相微观组织、表层硬度分布、残余应力、疲劳寿命和断口形貌等特征。研究结果表明,TB8钛合金螺栓样件在20、0、-20和-40℃的平均疲劳寿命分别为2.46×10^(5)、2.83×10^(5)、2.96×10^(5)和3.74×10^(5)循环周次。基于螺栓断口形貌,揭示了不同温度下的疲劳断裂失效机理与模式,随着温度的降低,其疲劳失效形式由常温20℃的塑性断裂逐渐转变为解理断裂和脆性断裂。In order to quantify the service life of a certain type of mechanical TB8 titanium alloy bolt,the typical bolt sample was taken as the target object,and the metallographic microstructure,surface hardness distribution,residual stress,fatigue life and fracture morphology of TB8 titanium alloy bolt were analyzed.The results show that the average fatigue life of TB8 titanium alloy bolt sample at 20,0,-20 and-40℃is 2.46×10^(5),2.83×10^(5),552.96×10^(5) and 3.74×10^(5) cycles number,respectively.Based on the bolt fracture morphology,the fatigue fracture failure mechanism and mode at different temperatures are revealed.The fatigue failure mode changes from plastic fracture at normal temperature of 20℃to cleavage fracture and brittle fracture with the decrease of temperature.

关 键 词：TB8螺栓 不同温域 拉-拉疲劳 断口分析 

分 类 号：TG146.1[一般工业技术—材料科学与工程]