Titanium alloys can be divided into: structural titanium alloys, heat-resistant titanium alloys, high-strength titanium alloys, corrosion-resistant titanium alloys and functional titanium alloys. In order to give users a more comprehensive understanding of the purpose and performance classification, the classification is now sorted out as follows:
1. Structural titanium alloy
Structural titanium alloys generally refer to alloys with high strength and long-term use temperatures below 400℃. This type of titanium alloy has a wide range of applications and can work in a wide temperature range below 400℃ and under a variety of environmental conditions, and the material performance requirements are also different. It is generally required to have good comprehensive mechanical properties, which are convenient for cold and hot processing and welding. Such as TA7, TC4, TB5 (Ti-153), TB6 (Ti-1023), etc., belong to this type of alloy. One thing that these alloys have in common is that they contain the basic alloy element Al, which is used to ensure the stability of the alloy's performance at room temperature and high temperatures. At the same time, they also have thermal strengthening capabilities and have certain processing plasticity.
2. Heat-resistant titanium alloy
Heat-resistant titanium alloys are also called high-temperature titanium alloys, which can usually work for a long time at temperatures above 400℃. It is mainly used for compressor discs and blades of aircraft engines, which can reduce the engine weight and increase the thrust-weight ratio of the aircraft. As a heat-resistant (high temperature) titanium alloy, the main performance indicators are high temperature strength, creep strength and high temperature thermal stability. The characteristic of high-temperature titanium alloy is that there are many types of alloy elements added, and commonly used elements include Al, Sn, Zr, Mo, Si, Nb, Nd, etc. Among them, Al, Sn, and Zr can solid solution strengthen the α phase, improving room temperature and high temperature performance; Nb is a rare earth element, which can prevent the growth of β grains, achieve the purpose of refining grains, and improve thermal stability and heat resistance. Therefore, the structural characteristics of most high-temperature heat-resistant titanium alloys are based on the α phase and a small amount of β phase, which is a near-α-type titanium alloy. This type of alloy retains the heat resistance and high thermal stability of the α-type alloy, and also has the characteristics of high strength and good plasticity of the α+β-type alloy. This type of alloys include TC6 and TC9. Thermal titanium alloy has good instantaneous performance, good durability and high corrosion resistance, as well as good welding performance. In order to restore plasticity, heat treatment should generally be performed after welding. High-temperature titanium alloys are generally used for rotating components, especially in the hot zone of the compressor where both temperature and pressure are relatively high. Titanium is used to reduce the weight of the blades, reduce the stress of the compressor disk, and make the disk section thinner. As the blade weight is reduced by 44%, the disc weight is reduced by 20%.
3. High-strength titanium alloy
Generally refers to titanium alloys with a strength of more than 1000MPa, such as TC6, BT14, BT15, BT16 (TC16) and other alloys. The three elements of Ti-Al-V are the basis of most high-strength titanium alloys, while Ti-Al-Mo is the basis of hot-strength titanium alloys. Heat-resistant titanium alloys and high-strength titanium alloys are collectively called thermally strong titanium alloys. Titanium alloys with high strength structure are based on stable solid solution of titanium, and there is no need for complex heat treatment to achieve high strength.
4. Corrosion-resistant titanium alloy
Although pure titanium can have strong corrosion resistance in atmosphere, seawater and oxidizing media, its corrosion resistance in neutral and reducing media is not strong. Use in such media can cause crevice corrosion. Therefore, a series of new corrosion-resistant titanium alloys have been developed based on pure titanium. For example, Ti-Mo system, Ti-Pd system, Ti-Mo-Ni system, etc., in order to resist stress corrosion of high-speed seawater, and at the same time have good high toughness and welding properties, deep-water submarine shells, propellers and hydrofoils can be used.
5. Functional titanium alloy
Through alloying, some normal titanium alloys can be developed into functional titanium alloys with certain special physical, chemical, biological and other functions. Such as shape memory alloys, flame retardant alloys, superconducting alloys, hydrogen absorption (hydrogen storage) functional alloys, superplastic molding alloys, shock absorbing alloys, and biocompatible alloys.
Shaanxi Hangyu Nonferrous Metal Processing Co., Ltd. was established in December 2005. It is a high-tech enterprise mainly forging and deep processing of precision parts such as titanium and titanium alloys, nickel, zirconium and other non-ferrous metal materials. Its product scope covers aerospace, weapons, marine equipment and petrochemical fields. The production capacity of titanium and titanium alloy rods, forgings and plates reaches 3,000 tons/year, and the machine-added capacity of non-ferrous metal precision parts reaches 500,000 pieces/year, and has the ability to deep processing of the entire industrial chain from titanium and titanium alloy raw materials to precision parts.
