Effect of post-weld heat treatment on microstructure and mechanical properties of welded joints of 6061-T6 aluminum alloy

被引：51

作者：

Yi, Jie ^{[1
,2
]}

Guan, Guan ^{[2
]}

Li, Shi-kang ^{[3
]}

Liu, Zhi-wen ^{[4
]}

Gong, Yan-li ^{[1
]}

机构：

[1] Hunan Ind Polytech, Coll Mech Engn, Changsha 410208, Hunan, Peoples R China

[2] Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China

[3] Huzhou Univ, Qiuzhen Coll, Huzhou 313000, Peoples R China

[4] Univ South China, Coll Mech Engn, Hengyang 421001, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2019年 / 29卷 / 10期

基金：

美国国家科学基金会;

关键词：

6061 aluminum alloy; double-pulsed MIG welding; post-weld heat treatment; microstructure evolution; mechanical property; CU-LI ALLOY; METAL TRANSFER; PRECIPITATION; DEFORMATION; EVOLUTION; PHASE; TEMPERATURE; STRENGTH; SEQUENCE; BEHAVIOR;

D O I：

10.1016/S1003-6326(19)65110-1

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

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 degrees C, large Q' phases were observed. And they were responsible for the peak value of the micro-hardness in the welded joints.

引用

页码：2035 / 2046

页数：12

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