There are many factors that affect the mechanical properties of forgings after residual heat quenching, including heating temperature, forging deformation temperature (initial forging), final forging temperature, deformation amount, deformation speed, residence time from final forging to quenching, quenching medium and tempering temperature.

Next, we mainly understand the influence of the retention time of aluminum alloy precision forgings after forging on the mechanical properties of forgings after residual heat quenching. Forgings must be trimmed and corrected after forging, so they must stay for a period of time before quenching. The shorter the stay time, the more deformation strengthening effect they will retain. However, the influence of residence time after forging on the mechanical properties of forgings is complicated, which is related to austenitizing heating temperature and deformation temperature. If the residual heat quenching of forgings is not required to improve the strength and toughness of steel, but only the properties obtained are not lower than the ordinary quenching and tempering level, the residence time after forging can be extended, so the residual heat quenching of forgings can also be used for free forgings.

The influence of residence time before quenching after final forging on mechanical properties varies with forging material and forging process. Dynamic recovery and dynamic recrystallization of carbon steel will be completed during forging, and recrystallization will not only occur after forging, but even aggregate recrystallization, so it should be quenched as soon as possible after forging. For alloy steel, especially when the deformation temperature is low and the deformation amount is small, recrystallization is not easy to occur, and proper stay after forging will form a multilateral structure which is beneficial to improve the strength, thus obtaining a high strength and toughness fit. When the residence time is too long, the strength of forgings will decrease. In a word, the residence time from final forging to quenching depends on the specific conditions of the performance requirements of forgings, and generally should not be long. The suitable residence time after forging can be found through experiments.

Advantages of forging aluminum wheel hub with aluminum alloy die for automobile compared with casting

Automobile aluminum alloy wheel hub is made of aluminum alloy by forging or casting process. Compared with steel wheels, the advantages mainly lie in the following aspects.

First, the weight is relatively light. Aluminum alloy wheels of the same size are usually two kilograms lighter than steel wheels, and the lighter weight can reduce the resistance when the vehicle starts, accelerates and brakes, thus achieving the effect of fuel saving.

Secondly, the heat dissipation effect is good. It is reported that the thermal conductivity of aluminum alloy material is about three times that of steel material, which means that the heat generated by the vehicle can be transferred to the air more quickly through the aluminum alloy wheel hub during the driving of the vehicle, thus improving the safety performance of the vehicle.

Thirdly, the steel wheel hub looks monotonous, which is seriously inconsistent with people's diversified aesthetic needs. The shape of aluminum alloy wheel hub is more colorful and has more visual impact, which enhances the aesthetic feeling and invisibly enhances the grade sense of the vehicle.

Moreover, the operation is lighter and the driving comfort is better. Due to the lightweight design of the aluminum alloy wheel hub, high precision and strong shock resistance, the general bumps and steering wheel vibrations can be eliminated in time during the driving of the vehicle, making it more flexible and braking when turning, thus improving the handling and driving comfort of the vehicle.

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