titanium alloy materials
Titanium is an important structural metal developed in the 1950s. Titanium alloys are widely used in various fields due to their high strength, good corrosion resistance and high heat resistance. Many countries in the world have recognized the importance of titanium alloy materials, which have been researched and developed successively and have been put into practical use.
The first practical titanium alloy was the Ti-6Al-4V alloy successfully developed in the United States in 1954 due to its heat resistance, strength, ductility, toughness, formability, weldability, corrosion resistance and biocompatibility. It is better to become the ace alloy in the titanium alloy industry, and the alloy is used in an amount of 75% to 85% of the total titanium alloy. Many other titanium alloys can be considered as a modification of the Ti-6Al-4V alloy.
In the 1950s and 1960s, the company developed high-temperature titanium alloys for aircraft engines and structural titanium alloys for the aircraft. In the 1970s, a number of corrosion-resistant titanium alloys were developed. Since the 1980s, corrosion-resistant titanium alloys and high-strength titanium alloys have been further developed. development of. The use temperature of the heat resistant titanium alloy has increased from 400 ° C in the 1950s to 600 to 650 ° C in the 1990s. The appearance of A2 (Ti3Al) and r(TiAl) based alloys allows titanium to be propelled from the cold end (fan and compressor) of the engine to the hot end (turbine) of the engine at the point of use of the engine. Structural titanium alloys are developed in the direction of high strength, high plasticity, high strength, high toughness, high modulus and high damage tolerance.
In addition, since the 1970s, shape memory alloys such as Ti-Ni, Ti-Ni-Fe, and Ti-Ni-Nb have appeared, and have been increasingly used in engineering.
There are hundreds of titanium alloys developed in the world, and the most famous alloys are 20-30 kinds, such as Ti-6Al-4V, Ti-5Al-2.5Sn, Ti-2Al-2.5Zr, Ti-32Mo, Ti-Mo-Ni, Ti-Pd, SP-700, Ti-6242, Ti-10-5-3, Ti-1023, BT9, BT20, IMI829, IMI834, etc. [2, 4].
According to relevant statistics, in 2012, the amount of titanium used in China's chemical industry reached 25,000 tons, a decrease from 2011. This is the first time since 2009, China's chemical titanium market has experienced negative growth. In recent years, the chemical industry has been the largest user of titanium processing materials, and its proportion in the total amount of titanium has been maintained at more than 50%, accounting for up to 55% in 2011. However, as the economy is in a downturn, the chemical industry will not only significantly reduce new construction projects, but also face industrial restructuring, some new production capacity will be controlled, and backward production capacity will be phased out. Affected by this, its shrinkage of the amount of titanium processed materials has become a natural thing. Prior to this, some insiders predicted that the amount of titanium used in the chemical industry peaked between 2013 and 2015. In terms of current market performance, the overall economic weakness in 2012 may lead to a recession in the chemical industry.