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Heat treatment method for aluminum alloy casting

Release time:

2021-11-03

Generally, the shape of aluminum alloy casting is more complex, the thickness is uneven, the structure is coarse, and the segregation is serious. Therefore, it can only be used normally after proper heat treatment. Typical heat treatment processes include annealing, quench aging, and stable tempering. The purpose of aluminum alloy casting heat treatment is to eliminate the internal stress of the casting. Eliminate the segregation of castings, change the shape of needle-like components in the alloy structure, improve the mechanical properties of aluminum alloy, stabilize the size, structure and performance of parts at high temperature, and improve the workability of castings. The following describes the process of aluminum alloy casting heat treatment.

Generalaluminum alloy castingThe shape is more complex, the thickness is not uniform, the organization grain is coarse, and the segregation is serious. Therefore, it can only be used normally after proper heat treatment. Typical heat treatment processes include annealing, quench aging, and stable tempering.aluminum alloy castingThe purpose of heat treatment is to eliminate the internal stress of the casting. Eliminate the segregation of castings, change the shape of needle-like components in the alloy structure; improve the mechanical properties of aluminum alloy; stabilize the size, structure and performance of parts at high temperatures; Improve the workability of castings. The following introductionAluminum alloy castingProcess flow of heat treatment.

① Annealing

铝合金铸造

In the special aluminum alloy annealing furnace, the room temperature is raised280-300°C. According to the thickness of the casting, the size of the furnace and the pouring form, the holding time is reasonably determined, generally 2 to 3 hours, and the annealing process can be completed. Then cut off the power supply, open the furnace door, and spread the casting on the cooling table for air cooling. Stacking is strictly prohibited.

② Quenching and aging

Consideringaluminum alloy castingThere are many impurities, the organization is not uniform, the melting point of the eutectic tissue is low, and the quenching heating temperature is lower than the dissolution temperature. The quenching heating temperature is generally500-535 ℃, furnace temperature should be lower than 350 ℃. It should be heated slowly, and the holding time is 2-20h. Considering the prevention of deformation and cracking of complex parts, aluminum alloy casting products should be cooled in water at 80-100°C. When selecting the quenching temperature, the influence of the above factors should be considered to avoid overheating or excessive combustion. The aging of aluminum alloy casting products is divided into two types: complete aging and incomplete aging, which should be reasonably selected according to the specific requirements of the parts.

③ Stable tempering

After casting and quenching, the aluminum alloy can be stably tempered in a special electric furnace without aging treatment. Generally, the tempering temperature is higher than the artificial aging temperature and close to the working temperature of the casting. After the heat preservation is completed, air cooling can be carried out.

Key words：

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