Stress-corrosion behavior and characteristics of the friction stir welding of an AA2198-T34 alloy

Quan-qing Zeng; Song-sheng Zeng; Dong-yao Wang

doi:10.1007/s12613-019-1924-4

Volume 27 Issue 6

Jun. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(6): 774-782

Quan-qing Zeng, Song-sheng Zeng, and Dong-yao Wang, Stress-corrosion behavior and characteristics of the friction stir welding of an AA2198-T34 alloy, Int. J. Miner. Metall. Mater., 27(2020), No. 6, pp. 774-782. https://doi.org/10.1007/s12613-019-1924-4

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Quan-qing Zeng, Song-sheng Zeng, and Dong-yao Wang, Stress-corrosion behavior and characteristics of the friction stir welding of an AA2198-T34 alloy, Int. J. Miner. Metall. Mater., 27(2020), No. 6, pp. 774-782. https://doi.org/10.1007/s12613-019-1924-4

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Research Article

Stress-corrosion behavior and characteristics of the friction stir welding of an AA2198-T34 alloy

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Corresponding author:
Song-sheng Zeng E-mail: zsscsu@sina.com
Received: 23 June 2019; Revised: 30 September 2019; Accepted: 16 October 2019; Available online: 6 November 2019

Abstract

Abstract

To better understand the stress-corrosion behavior of friction stir welding (FSW), the effects of the microstructure on the stress-corrosion behavior of the FSW in a 2198-T34 aluminum alloy were investigated. The experimental results show that the low-angle grain boundary (LABs) of the stir zone (SZ) of FSW is significantly less than that of heated affected zone (HAZ), thermo-mechanically affected zone (TMAZ), and parent materials (PM), but the grain boundary precipitates (GBPs) T1 (Al₂CuLi) were less, which has a slight effect on the stress corrosion. The dislocation density in SZ was greater than that in other regions. The residual stress in SZ was +67 MPa, which is greater than that in the TMAZ. The residual stress in the HAZ and PM is −8 MPa and −32 MPa, respectively, and both compressive stresses. The corrosion potential in SZ is obviously less than that in other regions. However, micro-cracks were formed in the SZ at low strain rate, which indicates that the grain boundary characters and GBPs have no significant effect on the crack initiation in the stress-corrosion process of the AA2198-T34. Nevertheless, the residual tensile stress has significant effect on the crack initiation during the stress-corrosion process.
- slow strain rate test;
- residual stress;
- grain boundary characteristic;
- AA2198-T34 alloy;
- friction stir welding

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