Quenching and cooling rates for aluminium alloys

Quenching and cooling rates for aluminium alloys

The cooling rate during quenching in aluminium quenching furnaces must ensure that the supersaturated solid solution is held in place and does not decompose. This prevents the reinforcing phase from precipitating and reducing the mechanical properties after quenching and ageing. Therefore, the faster the cooling rate during quenching, the better. However, the greater the cooling rate, the quenched product residual stress and residual deformation is also greater, so the cooling rate should be determined according to the different alloys and different shapes and sizes of products. General quenching of the alloy is sensitive to the cooling rate, the choice of cooling rate to large. Such as 2A11, 2A12 alloy quenching cooling rate should be more than 50 ℃ / s, and 7A04 alloy is very sensitive to the cooling rate, the quenching cooling rate required in 170 ℃ / s or more.

In addition, for the shape, size of different products should be used for different cooling rates, usually mainly by adjusting the temperature of the quenching medium to achieve. For the shape of simple, small and medium-sized, bar available room temperature water quenching (water temperature is generally 10 ~ 35 ℃), for the shape of complex, large differences in wall thickness of the profile, available 40 ~ 50 ℃ of water quenching. And for particularly easy to produce deformation of the product, even the water temperature can be increased to 75 ~ 85 ℃ quenching. The test proves that as the water temperature rises, the mechanical properties and corrosion resistance of the quenched products are reduced.

This is the basic content of the quenching and cooling rate of aluminium alloys. We will have more details in the future. Or you can contact us for a free consultation.