Where Does The Loss Of Aerospace Titanium Bar Come From?

As a new type of material aerospace titanium bars are now used in two main areas of flying machines.

1) Aircraft engines: As the heart of an aircraft, the engine not only has to withstand extreme stress and high temperatures, but also has to ensure a high thrust to weight ratio (thrust/mass). Components such as engine compressor discs, blades, high-pressure compressor rotors and compressor magazines are made of titanium alloy.

(2) aircraft fuselage and fasteners: titanium in the medium temperature high strength, corrosion resistance, light mass and other characteristics of the perfect to meet the requirements of the fuselage materials, landing gear components, large forged wing structural parts, fuselage skin, heat shields, etc. are made of titanium alloy. At the same time many carbon fibre composites are used on the aircraft, titanium alloy and carbon fibre reinforced composites have matching modulus of elasticity and similar coefficient of thermal expansion; and have good chemical compatibility and are not susceptible to galvanic corrosion.　

The loss of aerospace titanium bar this mainly comes from: (1) the mechanical properties of the raw material in the later forging or heat treatment process is not up to standard, resulting in scrap (material rate); (2) the later material processing process due to cutting, deep punching and other processes to form edges, edges may appear stress concentration or shape and size is not suitable, can not continue to use (loss rate). The dual factors lead to a higher demand for titanium blanks per unit weight of military titanium compared to civilian titanium. The main demand for aerospace titanium alloys also comes from the regular maintenance and replacement of aircraft engines. Titanium alloys are currently used in engines mainly in the medium-temperature region (some ceramic-based composites in the low-temperature region and nickel- or cobalt-based high-temperature alloys in the high-temperature region), with a mass share of about 30%.