Titanium and titanium alloy are light, high strength, corrosion resistant structural materials, in aviation, aerospace, ships, weapons, chemical, petrochemical, metallurgy, electric power, light industry, salt, construction, Marine engineering, medicine, sporting goods and daily living utensils and other fields have been widely used.
Aero engine is the application of titanium alloy is one of the earliest and most promising fields, as early as in the 1870s, titanium alloy in the Russian aero engine consumption reached 50% of the metal parts of the product. In recent years, it is noteworthy that the use of titanium alloy in military aircraft engine products has shown a declining trend, on the contrary, the use of titanium alloy in large civil engines has shown an increasing trend.
This increasing trend is mainly due to the wider application of gas turbine engines in large airliners, the accumulation of experience in the production and application of titanium alloys, and the improvement of the performance and reliability of titanium alloys. Currently, the turbofan engines used in large airliners and transport aircraft are the most advanced. The application of titanium alloy in the new type of gas turbine fan engine, only from the point of view of weight reduction, the benefit is very obvious. Production of such engines has increased significantly in recent years and is already showing signs of increasing further.
Compared with the new-type combustion turbofan engine, the consumption of titanium alloy for military engine shows a declining trend. The main reason for the relative reduction of titanium in military engine can be explained not only by the small production batch, but also by the supersonic engine and turbojet engine that military aircraft hope to use, so the consumption of titanium is relatively less.
Titanium alloy is mainly used in the manufacture of engine fans and compressor discs, blades and isolators, as well as engine intake cases, air collectors and other parts. Heat-resistant titanium alloy can generally work at the temperature of 500 ~ 550℃, even at 600℃ can also work normally, and structural titanium alloy can only work at 300 ~ 350℃.
Structural titanium alloys have better specific strength, plasticity and fracture resistance than heat-resistant titanium alloys. Therefore, structural titanium alloys are particularly suitable for the fabrication of large size turbine fan disks and blades.
A variety of data and data show that the replacement of steel material with titanium alloy engine can reduce the structural weight of the engine by 30% ~ 40%. The economy of weight reduction, mainly depends on the structure of titanium alloy dosage and design.
