Effect of post-weld heat treatment on microstructure and mechanical properties of laser welded 7075Al alloy

Mingyang ZHANG; Yiming JIANG; Chunming WANG; Qiubao OUYANG; Gaoyang MI

doi:10.12073/j.hjxb.20220501002

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2022 > 43(8): 13-18. > DOI: 10.12073/j.hjxb.20220501002

Mingyang ZHANG, Yiming JIANG, Chunming WANG, Qiubao OUYANG, Gaoyang MI. Effect of post-weld heat treatment on microstructure and mechanical properties of laser welded 7075Al alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2022, 43(8): 13-18. DOI: 10.12073/j.hjxb.20220501002

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Effect of post-weld heat treatment on microstructure and mechanical properties of laser welded 7075Al alloy

1.
Huazhong University of Science and Technology, Wuhan, 430074, China
2.
State Key Laboratory of Metal Composite Materials, Shanghai Jiao Tong University, Shanghai, 200240, China

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Received Date: April 30, 2022
Available Online: August 04, 2022

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Abstract

Abstract

7075 high-strength aluminum alloy joints were prepared by laser self-fusion welding technology, and the effect of post-heat treatment on the microstructure and tensile properties of the joints was studied. The microstructure evolution and tensile fracture behavior of 7075 joints after post-heat treatment were characterized by SEM and EBSD systems. The results show that there are equiaxed grain regions, columnar grain regions, cellular grain regions and base metal as-rolled regions from the center of the weld to the base metal. The cellular and equiaxed grain regions are weak areas of the joint. Compared with the unheat-treated joint, the average tensile strength of the post-heat-treated joint reached 475 MPa, an increase of about 59%. The nano-precipitated phase constructed by the post-heat treatment triggered the second-phase strengthening mechanism, which was the main factor to improve the tensile strength of the joint.
- laser welding,
- post-heat-treatment,
- 7075 aluminum alloy,
- mechanical properties,
- fracture behavior

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References

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