At present, aluminum alloy has the largest number of die castings. It has light weight, high specific strength, high mechanical properties and corrosion resistance, etc. However, compared with zinc alloy, its casting performance is relatively poor, and it has a tendency to stick to the mold. , it is more likely to produce defects such as oxidation, gas absorption, segregation, slag inclusions, and large crystal grains during smelting. Iron is a harmful element in aluminum alloys, but when the iron content in aluminum alloys is lower than 0.6%, it will be damaged during the production process. Die sticking is easy to occur in the medium, and when it is higher than 1%, the mechanical properties of the alloy will be reduced. The reasons for the "iron increase" of aluminum alloys mainly come from three aspects:M14 SERIES UNIVERSAL CYLINDRICAL GRINDING MACHINE 1) During the smelting process, there are many opportunities for contact between iron and alloys, such as crucibles, iron spoons, ladles, smelting tools, etc., and their surfaces should be coated with paint.M13 SERIES CYLINDRICAL GRINDING MACHINE 2) The dissolution rate of iron in molten aluminum alloy increases with the increase of temperature. When the melting temperature of aluminum alloy is higher than 750°C, it is called "overburning of aluminum alloy". At this time, the dissolution rate of iron increases rapidly.Pressureless Sintering of Silicon Carbide Ceramics 3) In addition to the temperature factor, the iron increase in aluminum alloy is also related to time, that is, the longer the holding time, the more iron is added, and the air intake is also increased. All are beneficial.What needs to be done for heat treatment with vacuum oil quenching furnace?