TC2 titanium alloy is an advanced α-type titanium alloy containing 4% of the α-stable element aluminum and 1.5% of the β-stable element manganese. TC2 titanium alloy has high strength, excellent mechanical properties, good toughness and corrosion resistance. This alloy is generally used in the annealed condition and cannot be strengthened by heat treatment. The semi-finished products of TC2 alloy we provide include plates, strips, bars, pipes, forgings and die forgings, etc. These materials can be used to make parts for plate stamping and welding machines.
Chemical Composition of TC2 Titanium Alloy
Mechanical Properties of TC2 Titanium Alloy
|H 900*||H||H 1025||H 1075||H 1100||H 1150||H 1150-M|
|0.2% Yield Strength||185||175||165||150||135||125||85|
|Elongation % in 2″ or 4XD||14||14||15||16||17||19||22|
|Hardness, Brinell (Rockwell)||420 (C 44)||409 (C42)||352 (C 38)||341 (C 36)||332 (C 35)||311 (C 33)||277 (C 27)|
Physical Properties of TC2 Titanium Alloy
Density: 0.282 lb/inch>3
Melting point: 2560 – 2625°F
Poisson rate: 0.272
Resistivity: 463 Ohm-circ mil/ft
Thermal Properties of TC2 Titanium Alloy
TC2 titanium alloy has high tensile strength and hardness in the 600°F temperature range
TC2 titanium alloy has excellent oxidation resistance in the 1100°F temperature range
TC2 titanium alloy has good creep rupture strength in the temperature range of 900°F
The specific thermal performance is shown in the table below:
Coefficient of Thermal Expansion, in/in°F x 10>-6
* 70°F to indicated temperature.
TC2 Titanium Alloy Heat Treatment
The heat treatment of TC2 titanium alloy heat treatment includes two main points: annealing and stress relief annealing:
The annealing conditions of TC2 titanium alloy plates and plate parts are: 660-710°C, 15-60min, air cooling or slower cooling;
The annealing conditions for TC2 titanium alloy bars, forgings and pipes are: 740-790°C, 1-2h, air cooling.
- Stress relief annealing
The stress relief annealing conditions for TC2 titanium alloy are: 545-585°C, 0.5-6h, air cooling or furnace cooling.
What are the effects of forging and heat treatment processes on the hardness of TC2?
(1) For the hardness of TC2 titanium alloy raw materials, the change of annealing temperature has little effect on it. After annealing at 740 to 790°C, the hardness of the bar hardly changes. When the annealing temperature exceeds 800 °C, the hardness of the bar increases slightly.
(2) Through the furnace cooling treatment after annealing, the TC2 titanium alloy material can be obviously softened. However, the furnace temperature does not have much effect on the hardness, and it is recommended to choose 600 to 650°C for furnace cooling treatment.
(3) The cooling method after forging has a great influence on the hardness. The hardness value after water cooling is the lowest, and the hardness value of air cooling, air cooling and slow cooling increases in turn.
(4) The cooling method after forging will significantly affect the microstructure. Acicular martensite can be observed in water-cooled and air-cooled samples, and flaky OT phases are rarely precipitated; in air-cooled and slow-cooled samples, obvious flaky OT phases can be seen, and as the cooling rate becomes slower , the flaky ot phase precipitated on the residual p matrix will be thicker and clearer. At the same time, the recrystallization phenomenon of equiaxed ot phase will be more obvious.
Welding Properties of TC2 Titanium Alloy
The welding performance of TC2 titanium alloy is reflected in the following aspects:
- Temperature control: It is necessary to control the temperature of the workpiece and the welding area during welding to avoid overheating or rapid cooling, so as not to cause material deformation or cracks.
- Suitable welding method and process parameters: TC2 titanium alloy is suitable for argon arc welding, spot welding and seam welding. Welded joints are not prone to defects such as cracks and shrinkage cavities. The strength and plasticity of fusion welded joints are close to those of the base metal. After welding, it is best to carry out stress relief annealing to eliminate the internal stress of welding.
- TC2 titanium alloy has a low melting point and good liquid fluidity, which makes the welding process relatively stable, easy to control welding parameters, reduces thermal stress and strain during welding, and reduces welding deformation.
- Can be welded with a variety of materials: TC2 titanium alloy can be welded with a variety of materials, such as steel, aluminum, etc., so it is widely used in welding processes in aerospace, chemical, marine and other fields.
- Good low-temperature welding performance: TC2 titanium alloy has good low-temperature welding performance, which can complete the welding process at a lower temperature, reduce the heat-affected zone, and reduce the risk of welding deformation and brittle damage.
Formability of TC2 Titanium Alloy
TC2 titanium alloy has good process plasticity in hot state. For best forming results, hot stamping is usually recommended. If it is necessary to form parts in a cold state, it is recommended to carry out intermediate annealing treatment, and the annealing temperature should be controlled within the range of 650-680°C. For complex stamping parts, they should be formed under heating. The blank can be heated by resistance heating or oxygen-acetylene torch, and the heating temperature is generally between 550-600°C.
The main application of TC2 titanium alloy
TC2 titanium alloy has high strength and low density, good mechanical properties, good toughness and corrosion resistance. In addition, the process performance of titanium alloy is poor, and it is difficult to cut and process. During thermal processing, it is very easy to absorb impurities such as hydrogen, oxygen, nitrogen, and carbon. Also have poor wear resistance, complex production process. Titanium alloys are mainly used to make aircraft engine compressor components, followed by structural parts of rockets, missiles and high-speed aircraft.