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The composition of titanium alloy TC4 material is Ti-6Al-4V, which belongs to (α+β) type titanium alloy and has good comprehensive mechanical properties. Greater specific strength. The strength of TC4 sb=1.012GPa, the density g=4.51g/cm3, the specific strength sb/g=23.5, and the specific strength sb/g of alloy steel is less than 18. Titanium alloy has low thermal conductivity. The thermal conductivity of titanium alloy is 1/5 of that of iron and 1/10 of that of aluminum. The thermal conductivity of TC4 is l=7.955W/m·K.
Coefficient of linear expansion=8.6*10-6℃(0-100℃), specific heat=0.612j/g·℃. The modulus of elasticity of titanium alloy is low. The modulus of elasticity of TC4 is E=110GPa, which is about 1/2 of steel, so it is prone to deformation during processing of titanium alloy. Its Poisson's ratio is 0.34. The surface modification of TC4 (Ti-6Al-4V) and TA7 (Ti-5Al-2.5Sn) titanium alloys adopts two implantation schemes. Tests show that after ion implantation, the titanium alloy increases the microhardness and significantly reduces The sliding friction coefficient is improved, and the wear resistance is effectively improved. In order to find out the modification mechanism, X-ray photoelectron spectroscopy (XPS) analysis was performed on the injected and uninjected samples, and satisfactory results were obtained.
●TC4 thermal expansion coefficient: TC4 titanium alloy has a series of advantages such as excellent corrosion resistance, small density, high specific strength, better toughness and weldability, etc., in aerospace, petrochemical, shipbuilding, automotive, medicine and other sectors Have been successfully applied.
●TC4 titanium alloy mechanical properties: tensile strength σb/MPa≥895, specified residual elongation stress σr0.2/MPa≥825, elongation δ5 (%) ≥ 10, reduction of area ψ (%) ≥ 25
●TC4 titanium alloy density: 4.5 (g/cm3) working temperature -100 ~ 550 (℃)
●TC4 titanium alloy chemical composition: TC4 contains titanium (Ti) balance, iron (Fe) ≤ 0.30, carbon (C) ≤ 0.10, nitrogen (N) ≤ 0.05, hydrogen (H) ≤ 0.015, oxygen (O) ≤ 0.20 , Aluminum (Al) 5.5～6.8, Vanadium (V) 3.5～4.5
Oxygen, nitrogen, carbon and hydrogen are the main impurities in titanium alloys. Oxygen and nitrogen have greater solubility in the α phase, which has a significant strengthening effect on the titanium alloy, but it reduces the plasticity. It is usually stipulated that the oxygen and nitrogen content in titanium is 0.15 to 0.2% and 0.04 to 0.05%, respectively. The solubility of hydrogen in the alpha phase is very small. Too much hydrogen dissolved in the titanium alloy will produce hydrides, which will make the alloy brittle. Generally, the hydrogen content in titanium alloys is controlled below 0.015%. The dissolution of hydrogen in titanium is reversible and can be removed by vacuum annealing. The chloride in the cutting fluid may also decompose or volatilize toxic gases during use. Safety protection measures should be taken when using it, otherwise it should not be used; after cutting, the parts should be thoroughly cleaned with a chlorine-free cleaning agent in time to remove chlorine residues Things. Among the three titanium alloys, α titanium alloy and α+β titanium alloy are commonly used; α titanium alloy has good machinability, followed by α+β titanium alloy, and β titanium alloy is poor. The alpha titanium alloy code is TA, the beta titanium alloy code is TB, and the alpha + beta titanium alloy code is TC.