Titanium and titanium alloy are light, high strength and corrosion resistant structural materials, which have been widely used in aviation, aerospace, ships, weapons, chemical industry, petrochemical, metallurgy, electric power, light industry, salt production, construction, ocean engineering, medicine, sports goods and daily living appliances and other fields.
Aero-engine is one of the earliest and most promising applications of titanium alloy. As early as the 1870s, the amount of titanium alloy in Russian aero-engine reached 50% of the metal parts products. In recent years, it is worth noting that the use of titanium alloy in military aircraft engine products has shown a decreasing trend, while the use of titanium alloy in large civil engines has shown an increasing trend.
This increasing trend is mainly due to the extensive application of gas turbine engines in large airliners, the accumulation of titanium alloy production and application experience, and the improvement of titanium alloy performance and reliability. Currently, turbofan engines used in large airliners and transport aircraft are the most advanced. The application of titanium alloy in a new type of gas turbine fan engine has obvious benefits only from the point of view of weight reduction. In recent years, the production of this kind of engine has increased significantly, and has shown a trend of further increase.
Relatively new type of combustion turbofan engine, the titanium alloy for the dosage of the military engine is showing a downward trend, the main reason for reducing the number of military engine with the relative amount of titanium, can be interpreted as the production batch is lesser, can also be interpreted as want to use by military aircraft engine is a turbojet engine supersonic speed engine, as a result, the amount of titanium is relatively less.
Titanium alloys are mainly used in the manufacture of fan and compressor discs, blades and isolation devices, as well as engine intakes, 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 the structure of 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 manufacture of disc and blade of large turbofans.
Various data and data show that the replacement of steel material by titanium alloy in aircraft engine can reduce the weight of engine structure by 30% ~ 40%. The economy of weight reduction mainly depends on the amount and design of the structural titanium alloy.
