TC4 titanium alloy is currently one of the most widely used titanium alloys. It has high strength and good corrosion resistance. However, it is difficult to see seamless titanium tubes made of TC4 in the seamless titanium tube market at home and abroad. The titanium tube is thinner than other traditional metal pipe fittings, and the heat exchange effect is better. The TC4 pipes on the market are mainly high-strength thick-walled pipes produced by hot extrusion or oblique perforation.
In order to solve the key technology of TC4 seamless tube cold-rolling forming, a series of researches were carried out jointly by schools and enterprises. For example, the direct cold-rolling forming process is used to produce high-strength titanium alloy tubes, which not only greatly reduces the production cost but also meets the requirements for high-performance titanium alloy applications.
The billeting method with different deformations is adopted, and the tube blank is rolled into a tube with a total deformation of 70% after two passes and three passes, respectively. Carry out 800℃×1h vacuum annealing between passes. The cooling method is furnace cooling to 500℃ and then air cooling to room temperature to observe the changes in structure and properties. Concluded:
In the case of small deformation billeting, the wall thickness deviation is small, and the surface roughness is gradually reduced; for large deformation billeting, the wall thickness deviation is large, which will affect the wall thickness deviation of the pipes obtained by subsequent passes. In the case of the same total deformation, the more rolling passes, the greater the elongation and hardness of the pipe, and the higher the strength.
In summary, the small deformation billet has little effect on the anisotropy of the pipe; the anisotropy of the mechanical properties in multi-pass rolling has certain fluctuations, and the material flow is strip-shaped when rolling with large deformation. When rolling with small deformation, the material flow is in a bundle shape. Under the condition of the same heat treatment conditions between passes and subsequent rolling processes, the structural distortion of the pipe obtained from the large deformation billet is more serious.
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