失效铝合金平底无铆连接接头的原位固相修复方法  

In-situ solid state repairing method for failure flat clinched joint of aluminum alloy

作　　者：张鹏[1,2] 陈超[3] 赵升吨 费亮瑜[1] 曹杨峰 张硕文 韩晓兰 李坤 Peng ZHANG;Chao CHEN;Sheng-dun ZHAO;Liang-yu FEI;Yang-feng CAO;Shuo-wen ZHANG;Xiao-lan HAN;Kun LI(School of Mechanical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;College of Mechanical Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;State Key Laboratory of High Performance Complex Manufacturing,Light Alloy Research Institute,Central South University,Changsha 410083,China;Mechanical Engineering College,Xi’an Shiyou University,Xi’an 710065,China)

机构地区：[1]西安交通大学机械工程学院,西安710049 [2]西安科技大学机械工程学院,西安710054 [3]中南大学轻合金研究院,高性能复杂制造国家重点实验室,长沙410083 [4]西安石油大学机械工程学院,西安710065

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第5期1361-1372,共12页中国有色金属学报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.51675414,51805416);the Joint Fund for Aerospace Advanced Manufacturing Technology Research Key Program,China(No.U1937203).

摘　　要：为了修复失效平底无铆连接接头并提高其力学性能,提出一种原位固相修复方法。通过对比研究平底无铆连接接头和修复接头的显微组织、力学性能和断裂失效行为,验证修复方法的可行性和有效性。结果表明,失效平底无铆连接接头的断裂颈部被成功地原位修复。焊核的显微组织被充分细化,使得修复接头的力学性能得到提升。转速和持续加热时间对修复接头的力学性能起着至关重要的作用。与平底无铆连接接头相比,冶金结合使修复接头的力学性能得到加强。修复接头的最大拉剪强度提高了409.90%,最大断裂伸长量提高了68.92%。断裂失效行为表明,修复接头的强度明显高于原始平底无铆连接接头,这说明失效平底无铆连接接头的修复方法是可行有效的。An in-situ solid state repairing method for the failure flat clinched joint was proposed to reconstruct the appearance and improve the mechanical properties.The microstructure,mechanical properties,and fracture failure behavior of the flat clinched and repaired joints were comparatively investigated to clarify feasibility and effectiveness of this method.Results indicate that the fractured neck of failure flat clinched joint is successfully repaired in-situ.The microstructure of the weld nugget is sufficiently refined,which enhances the mechanical properties of the repaired joint.Rotation speed and dwell time play crucial roles on the mechanical properties of joints.Compared with the initial flat clinched joint,the mechanical properties of the repaired joint are strengthened by the metallurgical bonding.The repaired joint has 409.90%higher maximum shear tension strength and 68.92%longer maximum extension at fracture.In addition,the fracture failure behaviors demonstrate that the repaired joint is much stronger than the flat clinched joint.This method for repairing the failure flat clinched joint is proven to be feasible and effective.

关 键 词：平底无铆连接 固相修复 平均晶粒尺寸 拉剪强度 断裂失效行为 

分 类 号：TG938[金属学及工艺—钳工工艺]