• Study on straightening process of U profile of extruded TC4 titanium alloy

The effects of straightening heating temperature and cooling rate on straightening deformation, microstructure and properties of U profile were studied. The results show that under the same cooling rate, the straightening deformation effect of U profile is good with the straightening temperature increasing. At the same heating temperature, with the decrease of cooling rate, the resilience after high temperature straightening deformation is smaller, and the straightening deformation effect of U profile is better. When the straightening heating temperature is 720℃ and the cooling rate is 30℃/min, the straightening U profile meets the relevant requirements of AMS2245 "Dimensional Tolerance of Titanium and titanium alloy extrusion bars, bars and profiles"; The straightening heating temperature is not higher than 720℃, and the straightening process does not change its structure and properties.

Titanium alloys have been widely used in aviation industry and aerospace technology because of their high specific strength, heat resistance and corrosion resistance. The advantages of using the hot extrusion process to produce titanium alloy profiles are that the hot extrusion method makes the deformed metal have the best three-way compressive stress state, so that higher quality products can be obtained. When the hot extrusion process is used, because the preparation of the mold is relatively simple, the flexibility of replacing the variety is greatly improved, which also improves the economy of the product.

Use:Titanium metal and alloy have  good heat resistance, low temperature toughness and fracture toughness, so it is often used as aircraft engine parts and rocket and missile structural parts. Titanium alloys can also be used as fuel and oxidizer storage tanks and high-pressure vessels. It has been used to make automatic rifles, mortar mounts and recoilless gun tubes.

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