There are three types of
titanium alloy: titanium alloy, titanium alloy and titanium alloy.It has small specific gravity, high specific strength, high temperature resistance, corrosion resistance, super memory, non-magnetic, low elastic modulus and biocompatibility, which make it widely used in the field. Titanium melting point is 1668 ℃, boiling point is 3400 ℃, higher than that of nickel iron, therefore, the light became the basis of its good heat resistance, can work under 500 ℃ for a long time. New type of titanium alloy long-term working temperature is higher, in 300-350 ℃ under its strength is 10 times higher than the aluminum alloy.In common use, the strength of beta + beta titanium alloy reaches 1.2GPa, 0.44MPa, and the specific strength is 23-27, both higher than that of alloy steel. The tensile strength of titanium alloy can exceed 1.5GPa, which must be applied to the processing of titanium alloy.
The thermal conductivity of titanium is 0.036 CAL, and the thermal conductivity of TC11 titanium alloy is worse. The elastic modulus of titanium is about 1/2 of that of steel.
Titanium alloys contain oxygen, hydrogen, nitrogen, carbon, and sometimes silicon, iron and other impurity elements. These elements undergo a strong reaction and exist in the lattice in interstitial form, which can improve the strength of titanium alloys, reduce the plasticity, and even deteriorate the fracture toughness, low temperature toughness, fatigue strength, corrosion resistance, cold forming and weldability. Titanium alloy has high chemical property in high temperature. At a certain grinding temperature, titanium forms an oxidized and nitride protective film, which makes the surface layer become brittle, reduces elasticity and increases the degree of hardening in the process. When grinding, it is easy to stick to and block the grinding wheel, resulting in overheating in grinding and loss of surface integrity.
