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Study on cold rolling forming technology of TC4 titanium alloy seamless tube

Jan 18, 2016

Titanium alloy has excellent corrosion resistance, small density, good fatigue strength and crack resistance. It has broad application prospects in aviation, aerospace, automobile, shipbuilding, energy and other industries. The titanium has better corrosion resistance and better specific strength, so the titanium tube is thinner than other traditional metal materials and tubes, and the heat exchange effect is better. TC4 titanium alloy is one of the most widely used titanium alloys at present. It has high strength and good corrosion resistance. However, it is difficult to see the seamless titanium tube of TC4 at home and abroad. TC4 titanium plate mainly dominated mainly high strength thick wall TC4 pipe on the market in hot extrusion or oblique perforation method for the production of pipes, now people with warm rolling manufacturing method of TC4 titanium alloy rolling products, the need for traditional warm rolling roll was improved in rolling tube induction heating device mounting machine on the structure of the processing equipment is complicated, complex process and high production cost. The main reason for the present situation is that the strength of TC4 titanium alloy is high, and the cold rolling forming is difficult. In order to solve the key technology of TC4 seamless tube cold rolling forming, a series of studies have been carried out by school enterprise. For example, the production of high strength titanium alloy tube by direct cold rolling forming technology can not only greatly reduce the production cost, but also meet the requirements of high performance application of titanium alloy. 

With different deformation measures, the tube was rolled into tubes with a total deformation amount of 70% after two and three passes respectively. 800 degrees Celsius is carried out between the passes; 1 hours vacuum annealing; the cooling method is cold to room temperature after 500 DEG C, and the microstructure and property change are observed. So, in the case of small deformation, the deviation of the wall thickness is small and the surface roughness is gradually reduced; the large deformation amount and the large deviation of the wall thickness will affect the wall thickness deviation of the tube after subsequent rolling.

Under the condition of the same total deformation, the more rolling passes, the greater the elongation and hardness of the pipe, the higher the strength. Good comprehensive performance.

Large rolling deformation of material flow banded, small rolling deformation of material flow in a bundle, a heat treatment and subsequent rolling process under the same condition, large deformation billet microstructure more serious distortion of income.

The effect of small deformation on the anisotropy of pipe is not obvious; the anisotropy of mechanical properties in multipass rolling has certain fluctuation.

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