The following is a comparative introduction betwee

The following is a comparative introduction between TB2 titanium alloy material and TC4 titanium alloy material:

Chemical Composition

• TB2 Titanium Alloy: It contains 5% Mo and 5% V as isomorphous β-stabilizing elements, 8% Cr as eutectoid β-stabilizing element, and 3% Al as α-stabilizing element, with a Mo equivalent of 18.15.

• TC4 Titanium Alloy: It mainly contains about 6% aluminum and about 4% vanadium, with an aluminum equivalent of approximately 7.0 and a molybdenum equivalent of 2.9.

Microstructure

• TB2 Titanium Alloy: It belongs to the metastable β-type titanium alloy.

• TC4 Titanium Alloy: It is a typical α + β-type titanium alloy.

Mechanical Properties

• Strength:

• TB2 Titanium Alloy: In the solution-treated and aged state, it has relatively high strength. Its tensile strength can reach a relatively high level, but it is slightly lower than that of TC4 titanium alloy. However, through appropriate processing and heat treatment processes, it can also meet the application requirements with high strength.

• TC4 Titanium Alloy: It has medium strength. The specified residual elongation stress σr0.2 ≥ 825 MPa. Its strength performs relatively excellently among many titanium alloys and can withstand relatively large loads. It is widely used in components with high strength requirements.

• Plasticity:

• TB2 Titanium Alloy: In the solution-treated state, it has good plasticity and can be cold-worked and formed, such as cold-heading and cold-rolling, to make parts of various shapes.

• TC4 Titanium Alloy: It also has good plasticity and toughness. Especially, it performs outstandingly in superplasticity and is suitable for forming by various pressure processing methods, such as forging and extrusion.

• Fatigue Performance: The fatigue performance of TB2 titanium alloy is inferior to that of TC4 titanium alloy. TC4 titanium alloy has relatively high fatigue strength and crack-growth resistance and performs more reliably in applications under cyclic loading.

Processing Performance

• Cold Working Performance:

• TB2 Titanium Alloy: In the solution-treated state, it has excellent cold-forming performance. It can cold-head bolts and rivets of various head shapes and can conduct cold working at room temperature with relatively low processing costs.

• TC4 Titanium Alloy: Its room-temperature plasticity is slightly lower than that of TB2 titanium alloy. When processing fasteners, it usually needs to use induction heating for hot-heading forming, with relatively high processing costs.

• Welding Performance:

• TB2 Titanium Alloy: It has good welding performance and can obtain welding joints with relatively good quality through conventional welding methods.

• TC4 Titanium Alloy: It also has good welding performance and can be connected by multiple welding methods. Moreover, the strength of the welding joint can reach about 90% of the strength of the base metal.

• Machining Performance: The machining performance of both is relatively poor because titanium alloys have low thermal conductivity and high chemical activity, and are prone to generating relatively high cutting temperatures and tool wear during the cutting process.

Physical Properties

• Density:

• TB2 Titanium Alloy: It has a relatively high density, approximately 4.8 g/cm³.

• TC4 Titanium Alloy: Its density is approximately 4.5 g/cm³. It has a certain weight advantage in fields such as aerospace and helps to reduce the structural weight.

• Elastic Modulus:

• TB2 Titanium Alloy: It has a relatively low elastic modulus, which is relatively close to the elastic modulus of human bones, having a certain application advantage in the biomedical field. However, it may not be very suitable for some structural components that require high stiffness.

• TC4 Titanium Alloy: Its elastic modulus is also relatively low, but slightly higher than that of TB2 titanium alloy. In some applications with requirements for elastic modulus, it needs to be selected according to specific circumstances.

Corrosion Resistance

• TB2 Titanium Alloy: It has good corrosion resistance and resistance to contact corrosion. When it is in contact with stainless steel, basically no corrosion occurs. When it is in contact with aluminum alloy and structural steel, it itself does not corrode, but the dissimilar metals are corroded. After anodization treatment, it can slow down the corrosion speed of structural steel and aluminum alloy in contact with it.

• TC4 Titanium Alloy: It also has excellent corrosion resistance and has good corrosion resistance performance in the atmosphere, seawater, oxidizing and neutral media. Its corrosion resistance is better than that of many common metal materials.

Application Fields

• TB2 Titanium Alloy: It is mainly used to manufacture aerospace fasteners that work below 300 °C and space-flight fasteners that work for a short time below 500 °C. It can also be used to manufacture satellite-rocket connection straps, corrugated cases, honeycomb structures, etc., and has important applications in the aerospace field.

• TC4 Titanium Alloy: It has a wider application range. In the aerospace field, it can be used to manufacture compressor components of aircraft engines, structural components of rockets, missiles and high-speed aircraft, etc. It also has numerous applications in fields such as petrochemical, shipbuilding, automobile, and medicine, such as manufacturing chemical equipment, ship components, automobile engine components, artificial joints, dental implants, etc.