Effect of post-weld heat treatment on microstructure and mechanical properties of welded joints of 6061-T6 aluminum alloy
(1. College of Mechanical Engineering, Hunan Industry Polytechnic, Changsha 410208, China;
2. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China;
3. Qiuzhen College, Huzhou University, Huzhou 313000, China;
4. College of Mechanical Engineering, University of South China, Hengyang 421001, China)
2. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China;
3. Qiuzhen College, Huzhou University, Huzhou 313000, China;
4. College of Mechanical Engineering, University of South China, Hengyang 421001, China)
Abstract: 6061 aluminum alloy T-joints were welded by double-pulsed MIG welding process. Then, the post-weld heat treatment was performed on the welded T-joints. The weld microstructure under different aging temperature and time was investigated by transmission electron microscopy and scanning electron microscopy. The mechanical properties were examined by hardness test and tensile test. The results showed that the micro-hardness was sensitive to heat treatment temperature and time. Increasing temperature was beneficial to the shortening of peak aging time. There were a large number of dislocations and few precipitates in the welded joints. With the increase of post-weld heat treatment temperature and time, the density of dislocation decreased. Meanwhile, the strengthening phase precipitated and grew up gradually. When the post-weld heat treatment temperature increased up to 200 °C, large Q'''' phases were observed. And they were responsible for the peak value of the micro-hardness in the welded joints.
Key words: 6061 aluminum alloy; double-pulsed MIG welding; post-weld heat treatment; microstructure evolution; mechanical property