The research of titanium alloy includes the creation of new alloy and the deepening research of common alloy. Before the 1960s, small-scale industrial expansion experiments were conducted mainly in laboratory development. In 1970, China formulated a titanium alloy standard, including 21 alloy grades. After entering the 1970s, the development of new alloys and the deepening of old alloys were carried out at the same time. At this stage, great efforts have been made to deepen the commonly used Ti-6Al-4V alloys. The major domestic research and production units have worked together to conduct a comprehensive study of the alloy’s composition range, smelting processing technology, intersection, structure and performance, and determined the processes of forging, rolling rods, extruding rods, precision forging rods and plates The metallurgical structure classification rating chart was measured, and the overall performance of the forgings and bars was determined. Basically, the composition of the alloy was regulated-the law of the relationship between the process-structure and performance was laid for the application of the alloy in aviation and other industries A good foundation.
New alloy planing mainly carried out research on high temperature, high strength, high toughness, corrosion resistance and functional materials, and created many new alloys. In terms of superalloys, by discussing the influence of a and b stabilizing elements, a small amount of additives, and rare earth elements on near-a alloys, alloys with good creep resistance and good thermal stability at 550 ° C were obtained. Test alloys such as Ti-633G, Ti-533IIS, and HTi-2Y have equivalent performance to IMI829, and the electron concentration theory to control the thermal stability of the alloy was proposed during the development process. In terms of high-strength titanium alloys, three metastable b alloys, TB2, Ti-22 and Ti-4721, have been successfully developed and expanded tests have been conducted. The research of Ti-Ni memory alloy has entered the application stage. Although most new alloys are temporarily difficult to produce and apply, a lot of work done in the process of creating innovative alloys is of great significance to the further development of titanium alloys in China.
Has also done a lot of research work on new technology. The new process mentioned here mainly refers to the near net shape process, including precision casting, isothermal forging, powder metallurgy forming, superplastic forming and diffusion connection. Because these processes can greatly improve the material utilization rate and reduce the cost of titanium products, more and more attention is paid abroad. All the above new technologies have been tested in China, and many papers were published at the 5th National Titanium Alloy Academic Exchange Conference. For example, the isothermally forged TCll alloy compressor disk has not only mastered the process, but also has been applied to the engine. The superplastic forming diffusion connection technology is used to process the complicated shape of the air-driven pump cabin door.
Test flight. In powder metallurgy, high-quality whisker alloy powder with low oxygen content is produced by plasma rotary electric pine and hydrogenation depacking process, and the recognition performance obtained by hot isostatic pressing is equivalent to that of smelting processed materials.
In the study of new materials and new processes, it is worth noting that in the past more than ten years, a microporous material has been developed in China. The product varieties include seamless and entangled microporous titanium tubes, titanium plates, titanium belts and Various shaped pieces. In the process of developing this material, 4 forming processes including powder rolling, isostatic pressing, plasticizing extrusion and molding were developed and adopted. This kind of hole-making material has excellent comprehensive properties such as high strength and hardness, heat resistance, corrosion resistance, earthquake resistance, and ability to be welded. It has achieved good results in many fields. As a part of titanium materials, such materials are promising for further improvement of technology and cost reduction.
Research And Progress Of New Alloys And New Processes
