Demand for titanium materials in China declined from year of 2011 to 2016, and then rose sharply. Since 2008, the demand for titanium has generally been on the rise. In 2011, the titanium market reached a stage high, and then the domestic demand for titanium materials began to decline. China's titanium industry has structural overcapacity, with high-end titanium materials in short supply for aviation and low-end titanium materials in serious overcapacity for civil use. Driven by the demand of high-end chemical, aerospace, shipbuilding and power industries, the demand for titanium processing materials in China continues to hit new highs.
1. Batch stability control technology of titanium alloy material quality
The batch stability of titanium alloy material quality directly affects the performance and safety of high-end assembly, and the development of its control technology is an eternal topic. Mass production quality stability by technology into the first batch, equipment status, on-site normative and other factors, and with the increase type titanium alloy ingot ingot, bar specifications, must vigorously on research and development to improve the quality of technological rationality, the identification process control key elements, thus improve the quality of the titanium alloy material batch stability control technology, To meet the requirements of the high-end field.
2. Preparation technology of large titanium alloy ingot, bar and forging billet
In order to improve the equipment performance and structural efficiency, reduce the weight of the structure, shorten the production cycle and control the cost, the consumption of titanium alloy parts of new military aircraft, civil large passenger aircraft and various aircraft engines is increasing, and the integral proportion of titanium alloy parts is increasing. For example, blades and bladed discs are replaced by integral bladed discs, multiple frame beams are replaced by integral frames, and the diameter of engine casing and drum is becoming larger and larger. In recent years, a number of large die forging forming equipment has been put into production in China, and large tonnage forming technology has developed rapidly. A large number of parts of more new military aircraft and large aircraft in China have clearly adopted the integrated manufacturing process route from the beginning of design, and the specifications of titanium alloy bars and forging billets for related parts and components are becoming larger and larger. The preparation technology of large titanium alloy ingot, bars and forging billets is still one of the important directions of industrial technology development.
3. Research and development of ultra-high strength and high toughness titanium alloy and high temperature titanium alloy
As the structural efficiency of new aviation equipment becomes higher and higher, the demand for ultra-high strength and high toughness titanium alloy becomes more and more urgent. Domestic units have also carried out the development of ultra-high strength titanium alloy of more than 1,350MPa. Domestic development of 1300MPa+60MPa• M1/2 grade of ultra-high strength and high toughness titanium alloy and a single weight of 5 tons, the section thickness of nearly 400mm super-large specification forging billet, but at present there is no such large specification forgings for ultra-high strength and high toughness titanium alloy materials. The technical maturity of ultra-high strength and high toughness titanium alloy needs to be further improved. High-temperature titanium alloy is the key material of aero-engine. The service temperature can cover 300℃~600℃. It can replace part of high-temperature alloy and stainless steel and be used to manufacture engine and gas turbine blade, disk, casing, drum and other engine parts. IMI834 titanium alloy is the most widely used titanium alloy with the highest technical maturity at 600℃. It has been used in Trent series of Rolls-Royce, EJ200 and PW350 of Pratt & Whitney. The technical maturity of high-temperature titanium alloys used at 600℃ and above in China cannot meet the development requirements of new aero-engines for the time being, and relevant development work needs to be accelerated.
4.Development and preparation technology of special titanium alloy for weapons
With high specific strength and good corrosion resistance, titanium alloy has unique advantages in weapons, ocean engineering, nuclear power and other fields. For example, using titanium alloy as the material of missile warhead can not only improve cruise speed by reducing weight, but also improve the precision strike capability of warhead with good damage tolerance. The development of new special titanium alloy is of great significance to its application in high performance weapons, ocean engineering, nuclear power and other fields.