Aluminum alloy die-casting is a common industrial component that requires heat treatment during its manufacturing process to improve its mechanical properties and corrosion resistance. This article will introduce the heat treatment process of aluminum alloy die castings.
1. Heat treatment types of aluminum alloy die castings
Heat treatment process of aluminum alloy die castings
The heat treatment of aluminum alloy die castings mainly includes two types: solution treatment and aging treatment.
Solution treatment refers to heating aluminum alloy die castings to a certain temperature so that the solid solution inside them reaches a state of uniform distribution. This can improve the strength and plasticity of aluminum alloys, while also improving its corrosion resistance.
Aging treatment refers to cooling the aluminum alloy die castings to room temperature after solid solution treatment and then performing heat treatment. This can further improve the strength and hardness of the aluminum alloy, and also improve its heat resistance.
2. Heat treatment process flow of aluminum alloy die castings
1. Solid solution treatment
The solution treatment temperature of aluminum alloy die castings is generally between 480°C and 520°C. The holding time depends on the composition and thickness of the aluminum alloy, generally 2 to 8 hours. After solid solution treatment, rapid cooling is required to avoid re-precipitation of the solid solution.
2. Timeliness treatment
The aging treatment temperature of aluminum alloy die castings is generally between 150°C and 200°C. The holding time depends on the composition and thickness of the aluminum alloy, generally 2 to 8 hours. After aging treatment, natural cooling is required.
3. Precautions for heat treatment of aluminum alloy die castings
1. Temperature control
The heat treatment temperature of aluminum alloy die castings needs to be strictly controlled. Too high or too low will affect its mechanical properties and corrosion resistance.
2. Keeping time control
The heat preservation time of aluminum alloy die-casting parts also needs to be strictly controlled. Too short or too long will affect its mechanical properties and corrosion resistance.
3. Cooling method selection
The cooling method of aluminum alloy die castings needs to be selected according to specific conditions. Generally, water quenching or air cooling can be used.
4. Preparation before heat treatment
Before heat treatment of aluminum alloy die castings, they need to be cleaned and degreased to ensure the heat treatment effect.
In short, heat treatment of aluminum alloy die castings is one of the important processes to improve their mechanical properties and corrosion resistance. During heat treatment, the temperature, holding time and cooling method need to be strictly controlled, and preparation work is also required to ensure heat treatment efficiency.