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Foshan, China

Li C.-W.,Central South University | Pan X.-Z.,Guangya Aluminium Co. | Liu L.-L.,Central South University | Cao W.,Central South University | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2010

The effect of different cooling rate on microstructure and mechanical properties of 6061 and 6005 aluminum alloys profile were determined by tensile test, metallographic examination, SEM and ESD analysis. The results show that the increase of cooling rate on-line quenching leads to improvement of material strength,the tensile strength of 6061 alloy is 223. 27 MPa by air-cooling and reach 279. 67 MPa by water-cooling, and that of 6005 alloy is from 260.56 MPa to 298.66 MPa While the elongation is decreased less than 1% both the alloys. The cooling rate of on-line quenching has a small effect on microstructure. The 6061 alloy is more sensitive to cooling rate than the 6005 alloy.

Wen L.,Central South University | Liu L.-L.,Central South University | Gao M.,Central South University | Pan X.-Z.,Guangya Aluminium Co. | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2011

The 6061 aluminum alloy cooling rate curves and surface heat transfer coefficient variation with temperature under different cooling methods was studied through using cooling curves which were obtained by end-quench, combine with finite difference method and inverse heat conduction method. The results show that when using mist spray and water spray quench, the cooling rate firstly increases, at about 400 °C, reaches to its peak value about 30 °C/s, then decreases; surface heat transfer coefficient with temperature is nonlinear, which firstly increases to the maximum at 150-100 °C, then decreases quickly with quench temperature decreasing. Surface heat transfer coefficient of wind quench raises rapidly, but increasement of the coefficient slows down obviously when temperature decreases to 500 °C.

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