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Investigation of quench sensitivity and transformation kinetics during isothermal treatment in 6082 aluminum alloy
Highlights ► The TTP and TTT curves of 6082 alloy were obtained. ► The constants k 2–k 5 and critical temperature region for 6082 alloy were identified. ► Quench sensitivity was analyzed in view of the transformation kinetics. ► Quenching rate should be more than 15°C/s at the sensitive temperature zone.
Abstract The quench sensitivity of 6082 aluminum alloy was investigated by time–temperature–property (TTP) curves. The sensitive temperature of quenching ranges from 250°C to 440°C in 6082 Al-alloy, and the nose temperature is about 360°C. During isothermal treatment process, the Mg2Si particles precipitate from the supersaturated solid solution, and the precipitation rate is the highest at the nose temperature. A number of rod-shaped β′ and β particles precipitate in the early stage of isothermal treatment at 360°C. Prolonging the holding time leads to more and coarser β particles in the matrix. Both the precipitation of β′ and β particles results in loss of solute and decreasing of the subsequent age hardening effect. Also, the important coefficients k 2–k 5 and critical cooling rate for 6082 Al-alloy are identified, and the properties after different rates of cooling were predicted using quench factor analysis.
Investigation of quench sensitivity and transformation kinetics during isothermal treatment in 6082 aluminum alloy
Highlights ► The TTP and TTT curves of 6082 alloy were obtained. ► The constants k 2–k 5 and critical temperature region for 6082 alloy were identified. ► Quench sensitivity was analyzed in view of the transformation kinetics. ► Quenching rate should be more than 15°C/s at the sensitive temperature zone.
Abstract The quench sensitivity of 6082 aluminum alloy was investigated by time–temperature–property (TTP) curves. The sensitive temperature of quenching ranges from 250°C to 440°C in 6082 Al-alloy, and the nose temperature is about 360°C. During isothermal treatment process, the Mg2Si particles precipitate from the supersaturated solid solution, and the precipitation rate is the highest at the nose temperature. A number of rod-shaped β′ and β particles precipitate in the early stage of isothermal treatment at 360°C. Prolonging the holding time leads to more and coarser β particles in the matrix. Both the precipitation of β′ and β particles results in loss of solute and decreasing of the subsequent age hardening effect. Also, the important coefficients k 2–k 5 and critical cooling rate for 6082 Al-alloy are identified, and the properties after different rates of cooling were predicted using quench factor analysis.
Investigation of quench sensitivity and transformation kinetics during isothermal treatment in 6082 aluminum alloy
Shang, B.C. (Autor:in) / Yin, Z.M. (Autor:in) / Wang, G. (Autor:in) / Liu, B. (Autor:in) / Huang, Z.Q. (Autor:in)
08.03.2011
5 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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