Quenching process of cast aluminum parts: In order to prevent the elements from precipitating in the supersaturated solution, it is very important to pass the 200 degree temperature range as fast as possible during quenching. The rate of cooling that maintains supersaturation conditions depends on the composition of the solution. The following is a detailed introduction to the quenching process of the cast aluminum parts.
Aging: After the first two stages of the hardening process, the vacancies and solute atoms of the solid solution are supersaturated. The precipitated supersaturated solute atoms can be balanced. The dispersion of solute atoms and the presence of excess vacancies are intended to facilitate the smooth passage of atoms through the crystal lattice. Because this process relies on temperature and time, it can be precipitated either naturally or artificially, that is, it can be precipitated at normal temperature and high temperature, respectively.
Aging strengthening effect: For the forging aluminum alloy which can be aged, the heat treatment of cold working or hot working is very important in practical application. A process like this is called a deformation heat treatment.
In order to remove the residual stress generated by quenching after the fixed solution treatment, this has to be done using a relatively low degree of cold work, and the cold work degree is also selected here, and the required strength can be completed in the subsequent natural aging; cold working The natural aging strength afterwards is higher than that obtained by natural aging alone. However, it is inevitable that the ductility of the alloy is greatly reduced.