异质钛合金线性摩擦焊接接头拉伸过程数值模拟研究  

Numerical Simulation of Tensile Process of Linear Friction Welded Joint of Heterogeneous Titanium Alloys

作　　者：肖旋 秦鼎强 毛悦 王心成 李菊 傅莉[1] XIAO Xuan;QIN Dingqiang;MAO Yue;WANG Xincheng;LI Ju;FU Li(State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;Aeronautical Key Laboratory for Welding and Joining Technologies,AVIC Manufacturing Technology Institute,Beijing 100024,China)

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072 [2]中国航空制造技术研究院航空焊接与连接技术航空科技重点实验室,北京100024

出　　处：《热加工工艺》2024年第7期37-40,46,共5页Hot Working Technology

基　　金：国家科技重大专项项目(2017-Ⅶ-0005-0098);陕西省重点研发项目(2020ZDLGY13-04)。

摘　　要：基于线性摩擦焊(LFW)接头的组织特征及其材料性能,探索接头分区建模方法,采用有限元技术实现了TC11/TC17异质钛合金LFW接头拉伸过程的数值模拟,揭示了接头拉伸过程中不同焊接区的应力应变演变规律,预测了接头的力学性能和断裂位置。结果表明,在2000 N均布的拉伸加载条件下,可计算预测出TC11/TC17异质钛合金LFW接头的屈服强度、抗拉强度分别为1045、1082 MPa,与实际测量值的误差小于2.5%。拉伸过程中接头在焊核区边缘存在应力峰值。在TC11母材区距焊缝中心24.2 mm位置存在应力和应变集中,应力集中区的应力值在1057 MPa以上,应变最高可达18.52%。该位置出现了颈缩现象,表明TC11/TC17异质钛合金LFW接头在该位置发生断裂。The joint zoning modeling method was explored based on the microstructure characteristics and material properties of linear friction welding(LFW)joint,and the numerical simulation of tensile process of TC11/TC17 heterogeneous titanium alloy LFW joint was realized by using finite element technology.Meanwhile,the evolution law of stress and strain in different welding areas during tensile process was revealed,and the mechanical properties and fracture location of the joint were predicted.The results show that under the tensile loading condition of 2000 N uniformly distributed load,it is predicted by numerical calculation that the yield strength of TC11/TC17 heterogeneous titanium alloy LFW joint is 1045MPa and the tensile strength is 1082MPa,with an error of less than 2.5%compared with the actual measured value.The peak stress is located at the edge of the nugget zone of the joint,and there is stress and strain concentration in TC11 base metal at the position 24.2 mm away from the weld center,in which the stress value is more than 1057 MPa and the maximum strain can reach 18.52%.The necking phenomenon also occurs at this position,indicating that the TC11/TC17 heterogeneous titanium alloy LFWjoint breaks at the position.

关 键 词：TC11/TC17钛合金 线性摩擦焊接 力学性能 纳米压痕 

分 类 号：TG453.9[金属学及工艺—焊接] TG407