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Analysis of Mechanical Properties and Heat Treatment Performance of TC4 Titanium Alloy

TC4 titanium alloy, also known as Ti-6Al-4V alloy, is an alpha+beta type titanium alloy widely used in aerospace, marine, medical and other fields. It has excellent comprehensive mechanical properties and heat treatment performance. This article will analyze its mechanical properties and heat treatment performance.
1. Mechanical properties of TC4 titanium alloy
TC4 titanium alloy has high strength and good plasticity at room temperature. Its tensile strength can reach 900-1100 MPa, yield strength is 800-950 MPa, elongation is between 10% -15%, and fracture toughness is also good. The density of TC4 is about 4.43 g/cm ³, which is much lower than that of steel, making it advantageous in applications with strict weight requirements, such as aviation engines.
TC4 alloy has excellent fatigue performance and strong corrosion resistance, especially suitable for high-strength and corrosion-resistant environments. Its elastic modulus is about 110 GPa, which is lower than that of steel, so it can reduce the stiffness requirements of the structure in some applications.
2. Heat treatment performance of TC4 titanium alloy
TC4 titanium alloy can improve its mechanical properties and microstructure through different heat treatment processes, including annealing, quenching, and aging treatment.
(1) Annealing treatment
Annealing treatment is usually carried out at 700-800 ℃ to reduce residual stress and improve the plasticity of the material. After annealing treatment, the tensile strength of TC4 titanium alloy is reduced, but its ductility is improved, making it suitable for occasions with high ductility requirements.
(2) Quenching treatment
The quenching temperature of TC4 titanium alloy is generally 930-950 ℃. After water or air cooling, a martensitic structure will be formed, which significantly improves the strength of the material. At this point, the tensile strength can reach over 1100 MPa, but the toughness may decrease.
(3) Timeliness processing
After quenching, TC4 titanium alloy is usually subjected to aging treatment at a temperature range of 480-600 ℃. After aging treatment, the hardness and strength of the alloy are further improved, especially suitable for structural components that require high strength.
3. Effect of Heat Treatment on the Microstructure of TC4 Alloy
Different heat treatment processes have a significant impact on the microstructure of TC4 alloy. Annealing treatment will generate a relatively uniform α+β phase; And quenching treatment forms needle like martensite; Aging treatment is beneficial for the formation of precipitation strengthening phases, and these structural changes directly affect the mechanical properties of the alloy.
4. Summary
TC4 titanium alloy has become one of the top high-performance structural materials due to its excellent mechanical properties and controllable heat treatment performance. By selecting a reasonable heat treatment process, its strength, toughness, and plasticity can be significantly improved to meet the needs of different application fields.

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