Microstructure and properties of GTAW welded joint of 2195 Al-Li alloy in different forming states

被引：0
|
作者：
Luo C. [1 ,2 ]
Li H. [1 ]
Xu G. [1 ]
Wu S. [1 ]
Wen Y. [2 ]
Yang L. [1 ]
机构：
[1] Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin
[2] Sichuan Aerospace Changzheng Equipment Manufacturing Co., Ltd., Chengdu
来源：
Hanjie Xuebao/Transactions of the China Welding Institution | 2021年 / 42卷 / 01期
关键词：
2195 aluminum lithium alloy; GTAW; Mechanical properties; Microstructure; Spray deposited;
D O I：
10.12073/j.hjxb.20200818001
中图分类号：
学科分类号：
摘要：
GTAW butt welding was carried out using spray-deposited 2195 aluminum-lithium alloy spinning and forging materials. The tensile strength and Vickers hardness of the joint were measured, and the metallographic microstructure and fracture morphology of the joint were observed. The EBSD characterization and statistical analysis of micro characteristic quantity were carried out for each area of the joint. The correlation between microstructure and mechanical properties of the joint was discussed. The results show that the spinning and forging materials have good GTAW processability, the tensile strength of the joint reaches 71% and 68% of the respective base materials, the elongation reaches 7.3%, and the tensile fracture shows ductile fracture characteristics. The proportion of low angle grain boundary of the metal in the joint weld zone is relatively low. The proportion of low angle grain boundary close to the spin side is 6.4%, and the proportion of low angle grain boundary close to the forging side is 7.8%. The heat affected zone between the spin side and the forging side and the fusion zone tend to similar microstructure. The average grain size of the base material, heat affected zone, fusion zone and weld metal are in order of 10, 10 − 15, 15 − 23, 20 − 25 μm, with the better "continuity" of the structure. The fine grain size and uniform composition of the base material are maintained during the welding process, which to a certain extent shows the application advantages of spray-deposited aluminum-lithium alloy materials. Copyright © 2021 Transactions of the China Welding Institution. All rights reserved.
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页码：8 / 15
页数：7
相关论文
共 18 条
  • [1] Gupta R, Nayan N, Nagasireesha G, Et al., Development and characterization of Al-Li alloys, Materials Science and Engineering: A, 420, 1, pp. 228-234, (2006)
  • [2] Kostrivas A, Lippold J C., Weldability of Li-bearing aluminum alloys, International Materials Reviews, 44, 6, pp. 217-237, (1999)
  • [3] Fielding Paul S, Gorge J., Aluminum-lithium for aerospace, Advanced Materials and Processes, 150, 10, pp. 2-24, (1996)
  • [4] Jiang Xunyan, Cheng Donghai, Chen Yiping, Et al., The superplastic deformation of electron beam welded aluminum lithium alloy, China Welding, 27, 1, pp. 41-45, (2018)
  • [5] Li Yang, The effect of graded aging process on the tensile properties of 2195 Al-Li alloy, (2009)
  • [6] Ma Yunlong, Yang Ziqi, Li Jinfeng, Microstructure and corrosion behavior of friction stir welded joints of 2195 Al-Li alloy, Transactions of the China Welding Institution, 40, 10, pp. 142-147, (2019)
  • [7] Zhao Yunpeng, Zeng Fuming, Zhou Zhiyong, Et al., Development of new aluminum alloy and its engineering application in sealed cabin structure, Manned Spaceflight, 22, 3, pp. 302-307, (2016)
  • [8] Lu Zhengping, Research on microstructure and properties of spray formed ultra-high strength aluminum alloy friction stir welded joints, (2015)
  • [9] Luo Chuanguang, Li Huan, Ma Fei, Et al., Spinning and welding test investigation of shell cover of spray-formed 2195 Al-Li alloy, Journal of Tianjin University, 53, 8, pp. 803-808, (2020)
  • [10] Brooks R G, Moore C, Leatham A G, Et al., The Osprey process, Powder Metallurgy, 20, 2, pp. 100-102, (1977)
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