Effect of welding parameters on microstructure and mechanical properties of 6082-T6 aluminum alloy FSW joint

被引：1
|
作者：
Deng S. [1 ,2 ]
Deng Y. [1 ,2 ,3 ]
Zhang Z. [2 ,3 ]
Ye L. [1 ,2 ]
Lin S. [1 ,2 ]
Ji H. [2 ,3 ]
机构：
[1] School of Materials Science and Engineering, Central South University, Changsha
[2] Cooperative Innovation Center for Advanced Nonferrous Metal Structural Materials and Manufacturing, Central South University, Changsha
[3] Light Alloy Research Institute, Central South University, Changsha
来源：
Ye, Lingying (lingyingye@csu.edu.cn) | 2018年 / Central South University of Technology卷 / 49期
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
6082-T6 aluminum alloy; Friction stir welding; Mechanical properties; Microstructure; Welding parameters;
D O I：
10.11817/j.issn.1672-7207.2018.10.007
中图分类号：
学科分类号：
摘要：
The effect of welding parameters on microstructure and mechanical properties of friction stir welded joints of 6082-T6 aluminum sheet of 5 mm in thickness was investigated by optical microscope, transmission electron microscope, electron backscatter diffraction, tensile test and hardness test. The results show that with the increase of the rotational speed at constant travel speed, the grains in nugget zone (NZ) grow up, the degree of recrystallization becomes higher, the number of the second phase increases and its distribution becomes more homogeneous, which results in the increase of the hardness of NZ. But the hardness of heat affected zone (HAZ) decreases because of the grains growth and serious coarsening of the second phase. When the rotational speed is low, the lowest hardness is between NZ and thermomechanically affected zone (TMAZ), and the hardness distribution profile of FSW joints is just like "U". When the rotational speed is high, the hardness of NZ is higher than that of HAZ, and the hardness distribution profile of FSW joints is just like "W". With the increment of the rotational speed, the tensile strength of the FSW joint of the low rotational speed group increases gradually, but the tensile strength of the FSW joint in the high rotational speed group increases first and then decreases. When the high rotational speed is 1 400 r/min, the best tensile strength of the joint is 271.63 MPa and the welding coefficient reaches up to 82.12%. © 2018, Central South University Press. All right reserved.
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页码：2413 / 2422
页数：9
相关论文
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