High-strength, thick-walled TC4 titanium pipes are primarily made via hot extrusion, oblique perforation, etc. Installing an induction heating device on the pipe mill will help this warm rolling process improve on the conventional roll. This type of processing machinery is expensive to produce and has a complex structure and procedure. The high strength of TC4 titanium alloy and the challenge of cold rolling forming are the primary causes of the current predicament. Titanium tube producers collaborated to conduct a number of studies in an effort to address the critical issue of TC4 seamless tube cold rolling forming.High strength titanium alloy pipe may be made using the direct cold rolling technique, which not only drastically reduces production costs but also satisfies the demands of high performance titanium alloy applications.
With a total distortion of 70%, the billets were rolled into the pipes in two passes and three passes, respectively. Vacuum annealing was done at 800°C with a one-hour gap between passes. The furnace was cooled to 500°C and then the air was cooled to room temperature as the cooling process. Changes in microstructure and characteristics were noticed. The result is that:
Wall thickness deviation is minimal and surface roughness gradually decreases when there is little distortion. High wall thickness deviation and large billet deformation will have an impact on the wall thickness deviation of the tube produced by future rolling runs.
The more rolling passes, larger elongation, and harder the pipe, the higher the strength is when the overall deformation is the same. good all-around performance. The material flow is banded when rolling with considerable distortion, but the material flow is bunched when rolling with small deformation. The pipe with high deformation has a more substantial microstructure distortion when inter-pass heat treatment and the same rolling procedure are used.
The anisotropy of the pipe is not significantly affected by the slight distortion of the blank. In multipass rolling, the mechanical characteristics' anisotropy changes.
