Application of titanium alloy in engine blade
Some titanium and titanium alloys retain their original mechanical properties at low and ultra-low temperatures. Many annealed titanium alloys have sufficient ductility and fracture toughness at -195.5℃. The strength of Ti-5Al-2.5Sn with especially low interstitial elements increases with the decrease of temperature, but the ductility decreases little. It still has good ductility and toughness at low temperature, and can be used at -252.7℃.
NINCT20 alloy is a new low temperature titanium alloy developed in China for the liquid hydrogen pipeline of rocket engine. The alloy has moderate strength (600 ~ 700MPa), low temperature performance, welding performance, cold forming performance and excellent liquid hydrogen compatibility. The strength can reach 1200MPa at -253℃(20K) temperature Above, the elongation can reach more than 10%.
China has made remarkable achievements on its "space road". Since April 24, 1970, when the Long March no. 1 carrier rocket put the Satellite dongfanghong No. 1 into orbit, China has launched long March carrier rockets and Shenzhou spacecraft, both of which use titanium materials. For example, low temperature TA7ELI titanium alloy gas cylinder developed in China has been used in CZ-XX series carrier rockets. Our country also uses BT20 titanium alloy to manufacture missile shell and fuel tank shell; TC4ELI titanium alloy is used to manufacture cryogenic liquid oxygen and liquid hydrogen high-pressure cylinders for carrier rockets.
The internal structure of the structural materials of each cabin of China's manned spacecraft is heat-resistant titanium alloy. The thrust structure of the main engine supporting the orbiter of China's space shuttle is made of titanium alloy. In addition, titanium alloy is also used in the manufacture of rocket disk, missile base components, missile power blade sleeve, etc.
As the first company in China to make outstanding achievements in the field of memory alloys such as titanium alloy, Positive red has successfully achieved a breakthrough in the transformation temperature of memory alloys ±1°, and ranks among the world's top research and development technology level of high-tech materials such as titanium alloy.