| The production development of the large and complex section Aluminum alloy profile with high precision、high surface quality and high mechanical properties is restrict by the level of the online quenching process. In this paper, the TTP curves of6061、6082、6063、6063A Aluminum alloy were acquired by interrupted quenching method, and the effect of isothermal processing on microstructure of6082and6061aluminum alloy after ageing was studied by means of TEM. Then combined the cooling curve acquired by performing jominy end quench test with quench factor analysis model, the performance of6082and6061aluminum alloy in condition of different quenching cooling rate were forecasted, and compared with measured values. Finally, the correlation of performance with quenching rate was established. This work aims to provide the basis for the development and optimization of the quenching process.The results showed that:The nose temperature of the TTP curves of6061、6082、6063、6063A was about350℃、340℃、360℃、375℃, and the critical temperature range was230～440℃、225～445℃、295～415℃265～450℃; The change rule of the quench sensitivity of four aluminum alloy was similar, the quench sensitivity in the middle-temperature zone is low while in the high-temperature zone it is high, and in the low-temperature zone it is between the both. The quench sensitivity order of these four kinds of aluminum alloy was6082>6061>6063A>6063; When6061and6082aluminum alloy at the nose temperature, with the holding time prolonged, the microstructure of specimens aged after being quenched would evolve from the significant strengthening effect of precipitates called GPⅠ and GPⅡ into the weak strengthening effect of precipitates called β’and β precipitates. Consequently, the hardness of alloy declined; The cooling rate of6061aluminum alloy at the critical temperature range230～440℃should be8.6℃/s, while the cooling rate of6082aluminum alloy at the critical temperature range225～445℃should be10.2℃/s. |
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