Abstract
Combining a retrogression heat treatment with simultaneous warm forming can increase the formability of peak-aged, high-strength aluminum alloys while allowing peak-aged strength to be recovered through a single reaging heat treatment after forming . This process is termed retrogression -forming -and-reaging (RFRA). This study investigates the applicability of RFRA to AA6013 -T6 sheet material. Elevated-temperature tensile tests were performed at temperatures from 230 to 250 °C and strain rates from 3.2 × 10−3 to 10−1 s−1. Tensile tests were followed by reaging with a simulated paint-bake heat treatment. Flow stress at a true strain of 0.10 ranges from 230 MPa (250 °C and 3.2 × 10−3 s−1) to 290 MPa (230 °C and 10−1 s−1), significantly lower than the room-temperature yield strength of 360 MPa in the T6 condition. The average elongation to rupture and reduction in area from elevated-temperature tests are 22% and 56%, respectively, which are similar to the room-temperature values for the T4 condition. Elevated-temperature testing reduced material hardness compared to the original T6 condition. Subsequent reaging with a simulated paint-bake raised hardness to 96% of the T6 condition in un-deformed material, but slightly decreased the hardness of the deformed material. Recommendations for implementing RFRA of AA6013 -T6 are presented.
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This work was supported by the National Science Foundation under GOALI grant number CMMI-1634495.
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Rader, K.E., Carter, J.T., Hector, L.G., Taleff, E.M. (2020). Plastic Flow of AA6013-T6 at Elevated Temperatures and Subsequent Reaging to Regain Full Strength. In: Tomsett, A. (eds) Light Metals 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-36408-3_56
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DOI: https://doi.org/10.1007/978-3-030-36408-3_56
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