Effect of Local Postweld Heat Treatments on Metal Inert Gas-Welded A7N01S-T5 Joints

Journal Article · Sat Jun 15 04:00:00 EDT 2019 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-019-04128-6· OSTI ID:22970715

Zhao, Pengcheng; Tang, Honglei ^[1]; Lin, Sen ^[2]; Wang, Lulu; Pan, Jiajing ^[1]

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1. Qingdao University of Science and Technology, College of Electromechanical Engineering (China)
2. Central South University, School of Materials Science and Engineering (China)

T6, T7, and retrogression and reaging (RRA) postweld heat treatments (PWHTs) were redefined and deployed to restore MIG-welded A7N01-T5 aluminum alloy joints in train-body structures using an inductive heating device. After the PWHT, the microstructures and mechanical properties of the joints were studied by x-ray diffraction (XRD), electron backscattered diffraction (EBSD), and scanning electron microscopy (SEM). The results showed that the hardness and strength of the joints were improved by the T6 treatment, and the tensile strength of the joints reached 87.39% of the base metal. However, an improvement in the corrosion resistance was not observed. The T7-treated joints enhanced the toughness of the welded joints and improved their corrosion resistance. The RRA-treated joints improved the toughness and corrosion resistance and increased the strength and hardness. The RRA treatment had a more comprehensive effect on the improvement of the welded joint structure and performance and is more suitable for postweld heat treatment of the aluminum alloy welded joints in the body of high-speed trains.

• OSTI ID: 22970715
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 6 Vol. 28; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CORROSION RESISTANCE
ELECTRON DIFFRACTION
HARDNESS
HEAT TREATMENTS
METALS
RADIORECEPTOR ASSAY
SCANNING ELECTRON MICROSCOPY
TENSILE PROPERTIES
X-RAY DIFFRACTION