电磁铆接加载电压对TA1铆钉绝热剪切变形的影响  

Effect of electromagnetic riveting loading voltage on adiabatic shear deformation of TA1 rivet

作　　者：胡思思 陈云鹤 邓将华[1] 范治松 HU Si-si;CHEN Yun-he;DENG Jiang-hua;FAN Zhi-song(School of Mechanical Engineering and Automation,Fuzhou University,Fuzhou 350116,China)

机构地区：[1]福州大学机械工程及自动化学院,福建福州350116

出　　处：《塑性工程学报》2020年第12期121-127,共7页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51705081,51774097);福建省自然科学基金资助项目(2018J05079);福建省高校青年自然基金重点项目(JZ160417);福建省高等学校新世纪优秀人才支持计划项目。

摘　　要：对TA1铆钉进行了电磁铆接工艺试验,利用光学显微镜和扫描电镜进行了微观组织结构观察,研究加载电压对TA1铆钉镦头变形的影响,分析绝热剪切带内微观组织演变以及带的萌生与扩展过程。结果表明,随着加载电压升高,铆钉变形量增加,晶粒变形越严重,剧烈塑性变形主要集中在剪切带。微裂纹萌生于剪切带中,而后沿剪切带两侧延伸,最终微裂纹相互连接导致镦头剪切破坏。当加载电压升至200 V时,镦头变形量为0.37,经标定,α和β相共存于剪切带,此时剪切带已发展为相变带。但是在带中大多数晶粒仍为初始相结构,仅有少部分发生相变。与α相相比,β相的取向分布显示出相对较弱的纹理强度。The electromagnetic riveting process test of TA1 rivet was carried out,and the microstructure observation was carried out by optical microscope and scanning electron microscope to study the influence of loading voltage on the deformation of TA1 rivet head and analyze the microstructure evolution in adiabatic shear band,as well as the initiation and expansion process of the band.The results show that as the loading voltage increases,the deformation of rivet increases and the grain deformation gets more severe,and the severe plastic deformation is mainly concentrated in the shear band.Micro-cracks sprout in the shear band,and then extend along the two sides of the shear band,and finally the micro-cracks are connected to each other,resulting in the shear failure of the head.When the loading voltage is increased to 200 V and the deformation of the head is 0.37,it is marked thatαandβphases coexist in the shear band,and at this time,the shear bands develope into phase transition bands.However,most of the grains in the band are still the initial phase structure,and phase transition occurs only in a small part.Compared withαphase,the orientation distribution ofβphase shows a relatively weak texture intensity.

关 键 词：电磁铆接 加载电压 TA1铆钉 微观组织 相变 

分 类 号：TG391[金属学及工艺—金属压力加工]