1. The high temperature deformation resistance of various aluminum alloys in aluminum alloy forging is quite different. The deformation resistance (also called flow stress) of aluminum alloys changes obviously with different compositions. Some low-strength aluminum alloys and medium-strength aluminum alloys, such as 6000 series aluminum alloys, have lower high-temperature deformation resistance, while high-strength aluminum alloys, especially ai-zn-mg-cu aluminum alloys, such as 7000 series aluminum alloys, have higher high-temperature deformation resistance, such as forged aluminum 2a50 aluminum alloy with a strength limit of 20mpa at 500 degrees Celsius and hard aluminum 2a12 aluminum alloy with a strength limit of 40mpa at 500 degrees Celsius.

2. Most commonly used deformed aluminum alloys have lower room temperature deformation resistance than carbon steel, but there are three kinds of high temperature deformation resistance: lower than carbon steel, equivalent to carbon steel, and higher than carbon steel.

3. The deformation resistance of aluminum alloy is very sensitive to temperature (it changes rapidly with the increase or decrease of temperature): with the decrease of temperature, its high-temperature deformation resistance increases rapidly, faster than that of carbon steel. By comparison, it can be seen that the growth rate of high-temperature strength limit is faster than that of carbon steel when it is dry. The temperature of carbon steel and low-alloy structural steel decreases by 100 degrees Celsius, and the strength limit increases by about 50%. However, when the temperature of aluminum alloy drops by 50 degrees Celsius, the strength limit increases by 50%-300%. Therefore, aluminum alloy, especially aluminum alloy with high alloying degree, cannot be finally forged at low temperature, so the forging temperature range of aluminum alloy is narrow and the operation should be rapid. The deformation resistance of aluminum alloy in die forging production determines the strength limit, processing conditions and complexity of forgings.

Matters needing attention in forging aluminum alloy processing

Aluminum alloy forging is an object in which metal exerts pressure and plastic deformation to shape the requested shape or appropriate shrinkage force. Guardian aluminum forgings show that the end of this kind of pneumatic paradigm is achieved by hammer or pressure. During the casting process, exquisite grain structure was built and the physical properties of metal were improved. In the imaginary use of parts, a correct imagination can make particles flow in the target purpose of main pressure.

Aluminum alloy forging requires each piece to be divergent without any porosity, extra space, inclusions or other defects. The components consumed by this method have a high ratio of strength to weight. These components are commonly used in aircraft structures.

Forging reminder, officially because aluminum forgings can stretch the length and shrink the cross section; Contractible length, extensible cross section; A changeable length, a changeable cross section. Therefore, it is widely influenced in all walks of life and is suitable for machinery, metallurgy, engineering and other fields.

What are the technological properties of forging aluminum alloy?

Wrought aluminum alloys belong to Al-Mg-Si-Cu series and Al-Cu-Mg-Ni-Fe series. There are many kinds of alloying elements in wrought aluminum, but the content of each element is less, so it has good thermoplasticity and is suitable for manufacturing all kinds of aviation forgings, especially large forgings with complex shapes. Mixing copper, magnesium, silicon and other elements with wrought aluminum alloy can form Mg2Si,Al2CuMg,CuAl2 and other compounds. After adding iron and nickel, the service temperature of wrought aluminum can be increased, so it is called heat-resistant wrought aluminum alloy. Common wrought aluminum alloys include 6A02,2A50,2B50,2A14, etc. The supply state is generally quenching plus artificial aging.

For forged aluminum alloys that need to work at a temperature away from the temperature, a small amount of transition group elements such as manganese, chromium, germanium and titanium are often added to make these elements soluble in the matrix energy, which greatly increases the recrystallization temperature and effectively prevents the recrystallization process and grain growth of two phases from dispersing and precipitating. The recrystallization temperature is also an index of heat resistance.

The high content of alloying elements in forged aluminum alloy will lead to a serious decline in process plasticity and corrosion resistance of forged aluminum alloy, and even make it difficult to press-work forged aluminum alloy. Therefore, the content of w(Cu) in wrought aluminum alloy is not more than 5%,w(Mg) is not more than 2.5%-5%,w(Zn) is not more than 3%-8% and W (Si) is not more than 0.5%-1.2%. Elements such as iron and silicon are harmful impurities in forging aluminum alloy.

Most wrought aluminum alloys have good malleability and can be used to produce forgings of various shapes and types. Aluminum satin parts can be produced by various existing forging methods, including free forging, die forging, dry forging, roll forging, rolling, spinning, ring rolling and extrusion.

The flow stress of the alloys obviously varies with the composition, and the maximum flow stress of each alloy is about twice the minimum. Some low-strength wrought aluminum has lower flow stress than carbon steel. The flow stress of some other forged aluminum alloys is very similar to that of carbon steel. As an alloy, wrought aluminum alloy is generally considered to be more difficult to forge than carbon steel and many alloy steels, but it is easier to forge than nickel, cobalt-based alloy and titanium alloy, especially when isothermal die forging process is adopted.

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