Introduction aux matériaux de la classe 5 Ti - 6Al - 4V
Grade 5 Ti6al4V is a common titanium alloy material, whose main components include titanium (Ti), aluminum (Al) and vanadium (V). Specifically, it contains about 6% aluminum and 4% vanadium, so it is sometimes called Ti-6Al-4V. Ti-6Al-4V combines the advantages of both α and β titanium alloys, showing good comprehensive performance.
Density: about 4.5 g/cm³.
Melting point: 1800°C.
Thermal conductivity: 15.24 W/(m·K).
Tensile strength: 539 MPa.
Elongation: 25%.
Sectional reduction: 25%.
Elastic modulus: 1.078 × 10^5 MPa.
Hardness: HB 195.
Features
High strength: Grade 5 Ti-6al-4V has a high specific strength, with a density of about 60% of steel, but its strength is close to that of ordinary steel.
High thermal strength: The operating temperature can reach 450-500°C, and it still maintains high strength at moderate temperatures.
Good corrosion resistance: It shows excellent corrosion resistance in humid atmosphere and seawater, and has strong resistance to pitting, acid corrosion, and stress corrosion.
Good low-temperature performance: It can still maintain good mechanical properties at low and ultra-low temperatures.
High chemical activity: It is easy to react with elements such as O, N, H, CO, CO2, etc. to produce a hard and brittle surface.
Low thermal conductivity: about 1/4 of nickel, 1/5 of iron, and 1/14 of aluminum.
Low elastic modulus: about 1.078 × 10^5 MPa.
Application areas
Aerospace: Widely used in key components such as aircraft fuselages, wing parts, and engine blades.
Military equipment: Such as missiles and high-speed aircraft structural parts.
Low-temperature structural materials: Suitable for manufacturing low-temperature and high-pressure containers, such as liquid hydrogen fuel tanks for rockets and missiles.
Welding performance
Grade 5 Ti-6al-4V alloy can be welded by a variety of welding techniques, including but not limited to argon arc welding, spot welding, electron beam welding and plasma welding. The strength of the welded joint is equivalent to that of the parent material 24.
Production and standards
Implementation standards: ASTM B348, ASTM B381, ASTM F136, ASTM B863, AMS4911, AMS4928, etc.
Melting and casting: The ingot needs to be melted in a vacuum consumable electrode arc furnace at least twice; the material for engine rotor parts needs to be melted three times.
Conclusion
Grade 5 Ti-6al-4V titanium alloy has been widely used in many fields such as aerospace due to its excellent comprehensive properties.
1. Grade 5 Ti-6al-4V titanium alloy characteristics:
Grade 5 Ti-6al-4V titanium alloy has a series of advantages such as excellent corrosion resistance, low density, high specific strength, good toughness and weldability
2. Grade 5 Ti-6al-4V titanium alloy mechanical properties:
Tensile strength σb/MPa≥895,
Specified residual elongation stress σr0.2/MPa≥825,
Elongation δ5(%)≥10,
Sectional contraction ψ(%)≥25
3. Grade 5 Ti-6al-4V titanium alloy chemical composition:
Grade 5 Ti-6al-4V
Contains titanium (Ti) Residue,
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
4. Application of Grade 5 Ti-6al-4V titanium alloy:
Since industrial pure titanium has good comprehensive properties and excellent corrosion resistance, it has become an indispensable structural material in many industrial parts. As a biological implant material, it has been widely used in clinical practice since the 1960s. Among all commonly used implant metal materials, titanium has good biocompatibility, and because its density and elasticity are close to human bones and it is non-magnetic, titanium is the most promising bioengineering material among the three major metal implant materials of stainless steel, cobalt-chromium-molybdenum alloy and titanium. The application of titanium has solved many major engineering and technical problems, promoted scientific and technological progress, and brought obvious economic benefits. The excellent performance and huge potential of titanium have demonstrated its broader application prospects. It has been successfully applied in aerospace, petrochemical, shipbuilding, automobile, medicine and other sectors.
