Ta18 (Ti-3Al-2.5V) was developed in the United States in the late 1960s α Type titanium alloy was developed for the application of aircraft pipeline pressurization system in the early stage. It not only has good room temperature, high temperature mechanical properties and corrosion resistance, but also has excellent cold and hot processing plasticity, formability and weldability; In addition, it is not sensitive to notch, and has excellent matching with the strength and stiffness of the composite, which can further obtain a good weight reduction effect. Therefore, ta18 titanium alloy can be used to manufacture components with working temperature up to 315 ℃ and certain strength and oxidation resistance requirements. For example, ta18 titanium alloy seamless pipe is suitable for high-pressure resistant and light hydraulic and fuel oil pipeline systems on aircraft and engines in aerospace.
Ta18 titanium alloy pipe has important applications in aerospace because of its excellent comprehensive properties. The developed countries led by the United States are ahead of China in the preparation technology and application of ta18 titanium alloy pipe. In recent years, with the development of China's aviation industry, the demand for high-strength ta18 titanium alloy pipes has become more and more urgent. Based on the development of medium and strong ta18 titanium alloy pipes, China has carried out key technical research on high-strength ta18 titanium alloy pipes. Through research in recent years, phased achievements have been made in the development of ta18 titanium alloy pipes, It is expected to be used in domestic aircraft within 2 ~ 3 years.
Ta18 titanium alloy is a widely used titanium alloy. The nature of this titanium alloy belongs to low alloying, and its essence is close to α Compared with other types of titanium alloys, this kind of titanium alloy first has a good room temperature; Secondly, it has excellent properties, especially high-temperature mechanical properties, which can withstand extremely high temperature. In addition, its corrosion resistance is also prominent; Finally, ta18 titanium alloy can not only be cold processed, but also be hot processed. No matter which processing method is conducive to welding. Because of this, this titanium alloy is widely used in the aerospace field as an indispensable pipeline system material in this field.
Surface finishing process of ta18 titanium alloy pipe
In the process of electrolytic magnetic composite grinding, ta18 is affected by the synergistic effect of wear assisted passivation and passivation assisted wear. Therefore, under reasonable process conditions, its surface burrs, scratches and other defects can be effectively removed, which is conducive to improving its surface micro morphology and obtaining good surface quality. When the electrolytic voltage is 9 V, the particle size is 185 μ When the magnetic abrasive particles of M grind the inner surface of ta18 tube for 50 min, the grinding effect is the best, the workpiece surface is uniform and flat, and the surface roughness Ra is from the original 1.60 μ M down to 0.13 μ m。
Cold rolling process of ta18 titanium alloy
(1) With the increase of feed rate, the radial tensile strain and circumferential compressive strain in the open area increase, and the forming load increases, resulting in the reduction of die life. Excessive feeding will also lead to metal overflow from the roll gap, resulting in cracking or folding.
(2) With the increase of rolling speed, the radial tensile strain and circumferential compressive strain decrease, and the vertical component also decreases.
(3) With the increase of friction coefficient, the radial tensile strain and circumferential compressive strain in the open area decrease, and the forming load increases. For thick walled pipes prone to internal surface quality problems, it is recommended to increase friction appropriately.
