Why do aluminum alloy quenching furnaces often use water for quenching
Aug. 22, 2020
Why do aluminum alloy quenching furnaces often use water for quenching?
The reason why the quenching medium of the aluminum alloy quenching furnace is often water is because the water has low viscosity, large heat capacity, fast evaporation heat, strong cooling capacity, and it is very convenient and economical to use. Enterprises have decided to use water as the quenching medium in terms of production and economic benefits. But its disadvantage is that after heating, the cooling capacity is reduced.
The cooling of the quenched product in water can be divided into three stages:
①The first stage is the film boiling stage. When the hot product just comes into contact with cold water, an uneven superheated steam film is immediately formed on its surface. It is very firm and has poor thermal conductivity, which reduces the cooling rate of the product.
②The second stage is the bubble boiling stage. When the vapor film is broken, the liquid close to the metal surface will boil violently, resulting in a strong heat exchange.
③The third stage is the heat convection stage. The circulation of cooling water, or the product swings left and right, or moves up and down, increases the convective heat exchange between the surface of the product and the water to increase the cooling rate.
