Die quenching limit of AA2024 aluminum alloy billet on servo press |
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Authors: | Jae-Yeol Jeon Ryo Matsumoto Hiroshi Utsunomiya |
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Affiliation: | Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, Japan |
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Abstract: | Die quenching of AA2024 aluminum alloy billets was carried out on a servo press with ram-motion control of WC-20 mass%Co dies directly after solution heat treatment (SHT). To clarify the dependence on billet size for die quenching, two billets with a height of h0 = 8 mm or 16 mm and with the same diameter of 16 mm were prepared. The cylindrical billets were heated in an electric furnace at 823 K and transferred to the press. Then the billets were uniaxially compressed with a reduction in height (Δh/h0) of 2% or 5%, and further held between the dies. The sandwiching duration by dies (td.q.) was varied from 0 to 8 s. Based a measured temperature change, hardness and TG–DTA analysis, it is found that die quenching is successfully carried out without precipitation hardening only in the case of the billet with a height of 8 mm and td.q. > 6 s. The reduction in height is limited less than 5% by intergranular fracture on side surface of billet during the die quenching process. |
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Keywords: | Die quenching AA2024 Precipitation Servo press Hardness |
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