Application of different types of titanium alloys-1
1. Titanium by iodine method, grade TAD: It is high-purity titanium obtained by iodization method, so it is called titanium by iodine method, or chemically pure titanium. As the purity of titanium increases, the strength and hardness of titanium decrease significantly; therefore, its characteristics are: good chemical stability, but very low strength.
At present, industrial pure titanium rods and titanium alloy rods are widely used in industry.
2. Industrial pure titanium: The difference from chemical pure titanium is that industrial pure titanium contains a large amount of oxygen, nitrogen, carbon and various other impurity elements (such as iron, silicon, etc.), which is essentially a low alloy content. of titanium alloy.
The characteristics of industrial pure titanium are: the strength is not high, but the plasticity is good, and it is easy to form, punch, weld, and have good machinability.
TA3 can be selected when higher requirements on wear resistance and strength are required. TA1 can be selected when better formability is required.
3. α-type titanium alloys, grades TA4 titanium rods, TA5 titanium rods, TA6 titanium rods, and TA7 titanium rods: these alloys are in α-type single-phase state at room temperature and operating temperature, and cannot be strengthened by heat treatment (annealing is the only form of heat treatment ), mainly relying on solid solution strengthening. The room temperature strength is generally lower than that of β-type and α+β-type titanium alloys (but higher than industrial pure titanium), while the strength and creep strength at high temperature (500-600℃) are the highest among the three types of titanium alloys; and The structure is stable, the oxidation resistance and welding performance are good, the corrosion resistance and machinability are also good, but the plasticity is low (the thermoplasticity is still good), and the room temperature stamping performance is poor. Among them, TA7 is the most widely used, which has medium-high strength and sufficient plasticity in the annealed state, good weldability, and can be used below 500 ℃; when the content of interstitial impurity elements (oxygen, hydrogen, nitrogen, etc.) is extremely low, It also has good toughness and comprehensive mechanical properties at ultra-low temperature, and is one of the excellent ultra-low temperature alloys.
