A Study on Infrared Local Heat Treatment for AA5083 to Improve Formability and Automotive Part Forming

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Automotive industries are increasingly employing aluminum alloys for auto parts to reduce vehicle weight. However, the low formability of aluminum alloys has been an obstacle to their application. To resolve the formability problem, some studies involving heat treatments under laboratory conditions have been reported. However, for industrial applications, the heat treatment sequence, heating energy efficiency, and a commercial part test should be studied. This work shows an infrared (IR) local heat treatment, heating only small areas where the heat treatment is required, for an aluminum alloy to improve the formability with a reduction of heating energy. The experiment shows that the formability drastically increases when the aluminum alloy is heat treated between two forming stages, referred to as intermediate heat treatment. The microstructures of the test pieces are evaluated to identify the cause of the increase in the formability. For an industrial application, an aluminum tailgate, which cannot be manufactured without heat treatment, was successfully manufactured by the IR local heat treatment with a reduction of energy. A simulation was also conducted with a stress-based forming limit diagram, which is not affected by the strain path and heat treatment histories. The simulation gives a good prediction of the formability improvement.
Publisher
SPRINGER
Issue Date
2017-10
Language
English
Article Type
Article
Keywords

CHANGING STRAIN PATHS; ALUMINUM-ALLOYS; LIMIT DIAGRAMS; ELEVATED-TEMPERATURES; SHEET-METAL

Citation

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, v.26, no.10, pp.5056 - 5063

ISSN
1059-9495
DOI
10.1007/s11665-017-2945-7
URI
http://hdl.handle.net/10203/226910
Appears in Collection
ME-Journal Papers(저널논문)
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