TC4

Titanium forgings are customized according to the drawings

Titanium rod Φ(8-400) ×L≤5000mm (rolled rod, forged rod)

Titanium plate/belt (0.3-60.0) × (400-1000) × (1000-3500) mm (cold rolled plate, hot rolled plate)

Titanium tube Φ(3-210) × (0.2-10.0) ×L (rolled pipe, extruded pipe)

Titanium ring Outer diameter φ(100-1200) × Inner diameter Φ(100-1000) × Height (20-800) mm

Titanium round cake Φ(150-1200) × (20-800) mm

Titanium wire Φ(0.1-7.0) ×L

1. Introduction to TC4 Materials

TC4 titanium alloy is a typical (α+β) titanium alloy, equivalent grade Ti-6Al-4V. Containing 6% alpha stabilizer aluminum and 4% beta stabilizer vanadium, TC4 owns balanced comprehensive performance, low density, high specific strength, outstanding corrosion resistance and excellent forming performance, making it an ideal structural material for aerospace engineering with ultra-high specific strength.

TC4 can work continuously at 400℃. It is widely applied in aviation for engine fan and compressor discs, as well as key aircraft structural parts including beams, joints and bulkheads. TC4 is normally supplied under annealed condition, and solution aging treatment is also available. It features good plastic forming property and superplasticity, suitable for all kinds of plastic forming, plus multiple welding and machining methods.

2. TC4 chemical composition

3. TC4 Physical properties

Density: 4.5 g/cm³, service temperature range -100~550℃

Tensile strength σb=1.012GPa, specific strength σb/g=23.5, while alloy steel specific strength is lower than 18.

4. Technical standards for TC4 materials

GB/T3620.1-2016 Titanium and Titanium alloy grades and chemical compositions

GB/T 3621-2007 ASTM/B265 Titanium and Titanium alloy sheet

GB/T2965 -2007 ASTM/B348 Titanium and Titanium alloy rod

GB/T 3624-2010 ASTM/B337 Titanium and Titanium alloy seamless pipe

GB/T16598-2013 ASTM/B381 Titanium and Titanium alloy tubes for heat exchangers and condensers

GB/T13810-1997 ASTM/F136 Titanium and Titanium alloy processing materials for surgical implants

GB/T3623-2007 ASTM/B863 Titanium and Titanium alloy wire

ASTM/B265 titanium and titanium alloy tapes and foils

TC4 heat treatment performance

When TC4 titanium alloy is heated to 1020℃, its high-temperature microstructure is single-phase β solid solution. Different cooling modes (water quenching, air cooling, furnace cooling) form different microstructures: water quenched structure consists of martensite α’+β phase; air cooled structure contains acicular α+β phase and original β grain boundary phase; furnace cooled structure forms strip α+β phase with original β grain boundaries.

Similarly, heating to 950℃ and 850℃ followed by different cooling rates yields different microstructures. At 950℃, water quenching produces primary equiaxed α + α’+β phase; air cooling forms primary equiaxed α + acicular β phase; furnace cooling gains primary equiaxed α with grain boundary precipitates. At 850℃, water quenching obtains primary equiaxed α + metastable β phase; air cooling gets primary equiaxed α + transformed β phase.

Room-temperature mechanical properties after heating TC4 to 1020℃, 950℃, 850℃ with different cooling rates are shown in the table below:

5. TC4 application fields

1. Aircraft compressor discs and blades, marine pressure-resistant shells, large forgings, die forgings
2. Rocket, missile and aircraft structural parts including fuselage frames, skins, engine components and beams
3. Seawater corrosion resistant pipeline systems, valves and pumps
4. Power plant condensers, petroleum refining equipment, seawater desalination devices and environmental pollution control equipment
5. Chemical heat exchangers, pump bodies and distillation towers
6. Medical device manufacturing