超声冲击强化7A52铝合金VPPA-MIG焊接接头的疲劳性能

doi:10.11896/cldb.21030115

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Abstract To improve the fatigue properties of the 7A52 aluminum alloy VPPA-MIG welded joint, the fatigue life of the welded joint was improved by changing the ultrasonic impact time. In this work, each welded joint was subjected to ultrasonic impact treatment for 2.5 min, 5 min, 10 min, 15 min, 30 min and 75 min. The scanning electron microscopy, the transmission electron microscope and the X-ray diffractometer were used to observe and analyze the surface morphology of welded joints and calculate the surface grain size of welded joints. The hardness, the residual stress and the fatigue properties of welded joints were examined via microhardness test, X-ray stress analysis and fatigue test, respectively. The influence of ultrasonic impact treatment on the fatigue properties of welded joints was analyzed comprehensively. The results show that when the ultrasonic impact time is 2.5—30 min, the defects of the welded joint are obviously reduced, with the grain on the surface of the welded joint refined to the nanometer level. When the ultrasonic impact time is 30—75 min, cracks appear on the impact surface. After ultrasonic impact treatment, the hardness of welded joints can reach 140HV, which is 40% higher than that of untreated welding joint, and the plastic deformation layer can reach 105 μm. Moreover, after ultrasonic impact treatment, the residual stress of welded joint changes from residual tensile stress to residual compressive stress, and the residual compressive stress increases in 2.5—30 min, with the maximum value of -329.2 MPa. When the ultrasonic impact time is 30—75 min, the residual compressive stress decreases. The fatigue strength of the welded joints treated by ultrasonic impact treatment are significantly improved. When the ultrasonic impact treatment time is 30 min, the maximum fatigue strength of the joints are 87.63 MPa, the fatigue strength of untreated welded members are 48.8 MPa and the fatigue strength are improved by 79.57%. Therefore, ultrasonic impact treatment on welded joint can enhance its fatigue performance and prolong the service life of welded components. Through this work, we hope to provide a theoretical basis for the wide use of 7A52 aluminum alloy VPPA-MIG welding components.

Key words： ultrasonic impact treatment 7A52 aluminum alloy VPPA-MIG microstructure fatigue property

Published: 10 August 2022 Online: 2022-08-15

CLC number:

TG404

Fund:National Natural Science Foundation of China (51165026 ,51765053).

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	LIU Chenghao
	CHEN Furong

Cite this article:

LIU Chenghao,CHEN Furong. Fatigue Properties of the VPPA-MIG Welded Joint of the 7A52 Aluminum Alloy Strengthened by Ultrasonic Impact[J]. Materials Reports, 2022, 36(15): 21030115-5.

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http://www.mater-rep.com/EN/10.11896/cldb.21030115 OR http://www.mater-rep.com/EN/Y2022/V36/I15/21030115

1 Chen C, Chen F R, Zhang H J. Rare Metal Materials and Engineering, 2018, 47(9), 2637.
2 Song C Q, Dong S Y, He P, et al. Procedia Manufacturing, 2019, 37, 294.
3 Chen F R, Liu C H, Li N. Transactions of the China Welding Institution, 2020, 41(9), 39(in Chinese).
陈芙蓉, 刘成豪, 李男. 焊接学报, 2020, 41(9), 39.
4 Wang W Q, Zuo H Y, Yang H, et al. Journal of Chongqing University of Technology (Natural Science), 2021, 35(11), 81(in Chinese).
王维青, 左浩越, 杨宏, 等. 重庆理工大学学报(自然科学版), 2021, 35(11), 81.
5 Jia C L, Chen F R. Materials Reports B:Research Papers, 2018, 32(8), 111(in Chinese).
贾翠玲, 陈芙蓉. 材料导报:研究篇, 2018, 32(8), 111.
6 Chen F R, Liu C H. Materials, 2021, 14, 2742.
7 Xu B, Jiang P, Geng S N, et al. Materials & Design, 2021, 203, 109538.
8 Wu W, Zhang G C, Qi H J, et al. Journal of Chongqing University of Technology (Natural Science), 2020, 34(9), 167(in Chinese).
吴玮, 张广川, 戚浩杰, 等. 重庆理工大学学报(自然科学版), 2020, 34(9), 167.
9 Mordyuk B, Prokopenko G, Milman Y V, et al. Materials Science and Engineering A-Steructural Materials Properties Microstructure and Proces-sing, 2013, 563, 138.
10 Kumar P, Mahobia G S, Chattopadhyay K. Key Engineering Materials, 2019, 813, 122.
11 Fueki R, Takahashi K. Optics & Laser Technology, 2021, 134, 106605.
12 Alalkawi H J M, Alhamdany A A, Hassan M R A. Al-Nahrain Journal for Engineering Sciences, 2018, 21(1), 141.
13 Sun Z B, Han Y Q, Du M H, et al. Rare Metal Materials and Enginee-ring, 2020, 49(8), 2674(in Chinese).
孙振邦, 韩永全, 杜茂化, 等. 稀有金属材料与工程, 2020, 49(8), 2674.
14 Han Y Q, Sun Z B, Du M H, et al. Electric Welding Machine, 2020, 50(9), 221 (in Chinese).
韩永全, 孙振邦, 杜茂华, 等. 电焊机, 2020, 50(9), 221.
15 Wang L S, Ye X X, Liu T, et al. Materials Reports B:Research Papers, 2015, 29(9), 71(in Chinese).
王铃声, 叶肖鑫, 刘涛, 等. 材料导报:研究篇, 2015, 29(9), 71.
16 Wang G Y, Wang H D, Zhang Y B, et al. Materials Reports A:Review Papers, 2016, 30(5), 87(in Chinese).
王桂阳, 王海斗, 张玉波, 等. 材料导报:综述篇, 2016, 30(5), 87.
17 He K, Chen N F, Wang C J, et al. Crystal Research and Technology, 2018, 53(2), 1700157.
18 Muniz F T L, Miranda M A R, Morilla dos Santos C, et al. Acta Crystallographica Section A: Foundations and Advances, 2016, 72(3), 385.
19 František N, Michal P, Libor T, et al. Materials Today: Proceedings, 2020, 32, 174.
20 Hu X D, Ma C B, Yang Y C, et al. International Journal of Steel Structures, 2020, 20(3), 1014.
21 Liu C, Shen J B, Yan J L, et al. Journal of Materials Engineering and Performance, 2020, 29(3), 1820.