Fatigue performance and fracture mechanism of dual-beam laser welded T-joints of TC4 titanium alloy

被引：0
|
作者：
Xu L. [1 ,2 ]
Su J.-J. [1 ]
Zhou S. [1 ,2 ]
Hui L. [1 ,2 ]
Wang L. [1 ,2 ]
Zhang L. [1 ]
机构：
[1] School of Mechatronics Engineering, Shenyang Aerospace University, Shenyang
[2] Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2019年 / 29卷 / 07期
关键词：
Fatigue fracture mechanism; Fatigue life; Laser dual-beam welding; Laser spot welding; TC4 titanium alloy;
D O I：
10.19476/j.ysxb.1004.0609.2019.07.09
中图分类号：
学科分类号：
摘要：
Based to the problem that the T-joint in the aircraft fuselage wall was often subjected to fatigue resistance during flight due to air circulation resistance, the laser double beam welding technology and laser spot welding technology were used on T-joint welding of TC4 titanium alloy. And the microstructure, tensile properties, low cycle fatigue behavior and fracture mechanism of the two joints were investigated. The results show that after welding by two different laser welding methods, the fusion zone structure is a basket structure composed of needle-shaped α' martensite. Compared with laser double-beam welding, the volume fraction of α' basket-like structure in the laser spot welded joint mesh basket increases, the needle-shaped α' martensite size increases and the phase spacing decreases. Compared with the tensile properties of the base metal, the tensile strength of the laser spot welded joint increases by 5.5%, and the tensile strength of the laser double beam welded joint increases by 5.8%.The median fatigue life of the laser double-beam welding specimen increases by 2.23 times. The main reason is that the mesh basket structure produces an interface strengthening effect on the welded joint and increases the joint strength, while the crack propagation of laser spot welding specimen penetrates the solder joint into the base material, causing the decrease of crack propagation resistance of the specimen. © 2019, Science Press. All right reserved.
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页码：1408 / 1416
页数：8
相关论文
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