Effect of creep ageing on mechanical properties and microstructure of 2219 aluminum alloy friction stir welding joint

被引：1
作者：
Jiao J. [1 ]
Li G. [2 ]
Zhan L. [2 ]
Yang Y. [2 ]
Hu Z. [3 ]
Liu G. [3 ]
机构：
[1] China Academy of Launch Vehicle Technology, Beijing
[2] College of Mechanical and Electrical Engineering, Central South University, Changsha
[3] Beijing Institute of Astronautical Systems Engineering, Beijing
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2021年 / 52卷 / 02期
关键词：
2219 aluminum alloy; Artificial aging; Creep aging; Friction stir welding; Mechanical properties; Microstructure;
D O I：
10.11817/j.issn.1672-7207.2021.02.005
中图分类号：
学科分类号：
摘要：
In order to find out the effect of aging heat treatment under creep stress on the mechanical properties and microstructure of 2219 aluminum alloy friction stir welding(FSW) joints, a comparative experimental study on friction stir welding of two different heat treatment processes, creep aging and artificial aging was carried out.The results show that the microhardness, tensile strength and elongation of creep aging sheet friction stir welding joint are higher than those of the friction stir weldingof artificial aging sheet (AA+FSW). The hardness of the two kinds of heat-treated plates in the weld seam area is roughly W-shaped distribution, and the minimum hardness locates in the thermo-mechanically affected zone. The tensile strength and elongation of the welded joint are lower than those of the base material. The average tensile strength of CA+FSW is 317.8 MPa (71.9% of the base material), which is higher than 293.8 MPa in AA+FSW(69.1% of the base material). Microstructure analysis shows that the precipitation phase of the substrats during the welding process has been re-dissolved. Among the CA+FSW plates, a small part of the precipitated phase θ' remains, but the precipitated phases of the AA+FSW plates are almost completely re-dissolved, which is the reason why the microhardness and tensile strength of the stress aging plate are higher after welding. © 2021, Central South University Press. All right reserved.
引用
收藏
页码：368 / 375
页数：7
相关论文
共 17 条
[1]  
ZHAN Lihua, YANG Youliang, Research on creep age forming technology for large integrated component, Aeronautical Manufacturing Technology, 59, 13, pp. 16-23, (2016)
[2]  
ZENG Yuansong, HUANG Xia, HUANG Shuo, The research situation and the developing tendency of creep age forming technology, Journal of Plasticity Engineering, 15, 3, pp. 1-8, (2008)
[3]  
ZHAN Lihua, LIN Jianguo, DEAN T A, Et al., Experimental studies and constitutive modelling of the hardening of aluminium alloy 7055 under creep age forming conditions, International Journal of Mechanical Sciences, 53, 8, pp. 595-605, (2011)
[4]  
HAMBRICK D M., Age forming technology expanded in an autoclave, Society of Automotive Engineer, 4, 6, pp. 649-664, (1986)
[5]  
SUN Zhao, ZHAN Lihua, LIU Jian, Et al., Fracture behavior in creep aging forming process of aluminum alloy 2219, Journal of Plasticity Engineering, 25, 5, pp. 284-290, (2018)
[6]  
SONG Jianling, LI Chao, Application of FSW technology to tank manufacturing of launch vehicle and its development, Welding & Joining, 5, pp. 21-27, (2018)
[7]  
LAKSHMINARAYANAN A K, MALARVIZHI S, BALASUBRAMANIAN V., Developing friction stir welding window for AA2219 aluminiumalloy, Transactions of Nonferrous Metals Society of China, 21, 11, pp. 2339-2347, (2011)
[8]  
THOMAS W M, NICHOLAS E D., Friction stir welding for the transportation industries, Materials & Design, 18, 4, pp. 269-273, (1997)
[9]  
LI Xiaoxia, HUANG Liang, LI Jianjun, Et al., Effects of compound technology of FSW and heat treatment on microstructures and properties of 2219 aluminum alloys, China Mechanical Engineering, 28, 23, pp. 2880-2888, (2017)
[10]  
HE Diqiu, YANG Chuanping, LIN Junyuan, Study on procedure sequence of friction stir welding and solution treatment of 2219 aluminum alloy, Hot Working Technology, 47, 5, pp. 1-4, (2018)
12