Aerospace aluminum alloy heat treatment technology

Aerospace aluminum alloy heat treatment technology

[China Aluminum Industry Network] With the development of transportation technology, aluminum alloys are widely used in aerospace materials due to their light weight, high strength, and ease of processing. The effective application of aluminum alloys reduces the structural weight of aircraft and improves flight performance. And increase the economic benefits, so aviation aluminum alloy technology has also received more attention, this issue Xiaobian will take everyone to understand the next aviation aluminum alloy heat treatment technology:

Aluminum alloy heat treatment uses air circulation electric furnace instead of nitrate salt furnace

The traditional heat treatment using nitrate salt furnace heating, there is a serious environmental pollution, energy consumption and waste of large shortcomings, and the air circulation furnace has the advantages of quick start, good energy saving effect, quenching transfer time is fast and adjustable to meet the different aluminum alloy parts Claim. The solid solution quenching after heating in the air circulating electric furnace has no pollution to the cooling medium, which is favorable for promoting the use of organic quenching media, reducing heat treatment distortion, and improving production efficiency.

The key technology of the air circulation electric furnace is how to ensure the uniformity of the furnace temperature (±3 to ±5°C), especially the requirements for the large-size furnace, and how to meet the requirements for the uniformity of the furnace temperature at lower temperatures (100 to 150°C). The second key technology is how to ensure rapid quenching transfer time, and can be adjusted and controlled according to different requirements of parts.

Organic quenching medium

Aluminum alloy quenching medium is commonly used water or hot water, but for heat treatment deformation or deformation of the case of stricter conditions, hot water can not meet the requirements, you must use organic quenching medium aqueous solution. An organic quenching medium aqueous solution is used instead of water in the air circulation furnace to reduce aluminum alloy heat treatment deformation and sheet metal parts calibration time by more than 50%.

Conductivity detection

Since aluminum alloy materials are used in aircraft manufacturing, tensile tests or hardness tests have been used to detect the quality of aluminum alloy heat treatment. Due to the heat treatment of aluminum alloys, there may be two different states at one strength (hardness) value, whereas there may be two different strength (hardness) values ​​in one state. Therefore, using only the hardness or strength to control the quality of the aluminum alloy after heat treatment is an lagging test method and cannot fully ensure the quality.

Conductivity detection is convenient and efficient, and it has high work efficiency. It is basically not affected by the shape, weight, and other conditions of the part being inspected. It has no unique damage to parts. Since the eighties, conductivity testing has gradually been applied to the inspection of aluminum alloy materials/parts in the heat treatment state. In GB/T12966-1991 "Aluminum alloy conductivity eddy current test method" standard, given the test method, GJB2894 a l997 "aluminum alloy conductivity and hardness requirements", the requirements of the conductivity and hardness values.

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