Titanium alloy precision parts, it has the following characteristics, 1: Low density, high strength, high specific strength 2: Excellent corrosion resistance 3: Good heat resistance, maintaining good mechanical properties at about 500°C. 4: Good low temperature performance. The strength of some titanium alloys (such as Ti-5Al-2.5SnELI) increases with the decrease of temperature, but the plasticity is not reduced much, and there is still good ductility and toughness at low temperatures. It is suitable for ultra-low temperature Under use. It can be used on liquid hydrogen and liquid oxygen rocket engines, or as ultra-low temperature containers and storage tanks on manned spacecraft. 5: No magnetic 6: Small thermal conductivity 7: The modulus of elasticity is small 8: The tensile strength is close to the yield strength 9: Titanium is easily oxidized at high temperature 10: Low damping resistance 11: Shape memory function Ti-50%Ni (atomic fraction) alloy, under certain temperature conditions, it has the ability to restore its original shape, so it is called titanium shape memory alloy. 12: Superconducting function NbTi alloy, when the temperature drops to close to absolute zero, the wire made of NbTi alloy loses resistance and can pass arbitrarily large currents. The wire does not generate heat and consumes no energy. Therefore, NbTi alloys are called superconducting materials. 13: Hydrogen absorption function Ti-50%Fe (atomic fraction) alloy has the ability to absorb a lot of hydrogen. Using this feature of Ti-Fe alloy, hydrogen can be stored safely, that is, it is not necessary to use steel high-pressure gas cylinders to store hydrogen. Hydrogen storage titanium iron alloy can also release hydrogen under certain conditions, so it is called hydrogen storage material.
The thermal conductivity of titanium alloy is small, and the cutting temperature is very high when processing titanium alloy. Therefore, the temperature of the tool is very high, the tip of the tool is sharply worn, and the service life is reduced. The low modulus of elasticity of titanium alloy makes the machined surface easy to spring back, especially the processing spring back of thin-walled parts is more serious, which is easy to cause strong friction between the flank face and the machined surface, thereby wearing the tool and chipping. Titanium alloys are very chemically active and easily interact with oxygen, hydrogen, and nitrogen at high temperatures, increasing their strength and decreasing plasticity. The oxygen-rich layer formed during heating and forging makes machining difficult.We improve the precision of titanium alloys by selecting reasonable tool materials, improving cutting conditions, performing appropriate heat treatment on the processed materials, and selecting reasonable cutting parameters.
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