properties of 6al-4v

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Titanium 6Al-4V

Chemistry Data

Aluminum

5.5 - 6.75

Carbon

0.08 max

Hydrogen

0.015 max

Iron

0.25 max

Nitrogen

0.05 max

Oxygen

0.2 max

Titanium

Balance

Vanadium

3.5 - 4.5

General Information

Principal Design Features

This alpha-beta grade is the most widely available and heavily used of all the titanium grades. The alloy is heat treatable and combines excellent strength and corrosion resistance with weld and fabricability. Beta Transus (F +/- 25) 1830.

Applications

6-4 is widely used in the aircraft industry in a variety of turbine and "hot" structural applications. It is generally employed in applications up to 400 C(750 F).

Machinability

As a family, titanium and its alloys have developed a mystique as a nightmare to machine. This is simply not the case. Experienced operators have compared its characteristics to those found in 316 stainless steel. Recommended practice includes high coolant flow(to offset the material's low thermal conductivity), slow speeds and relatively high feed rates. Tooling should be tungsten carbide designations C1-C4 or cobalt type high speed tools.

Forming

This alloy may be hot or cold formed. Popular methods include hydropress, stretch or drop-hammer. This material responds similarly to 300 series stainless steels.

Welding

Rated as "fair" in terms of weldability.

Heat Treatment

Solution treat at 904-954 C(1660-1750 F) for 2 hours followed by water quench.

Forging

Rough forge at 982 C(1800 F), finish at @ 968 C (1750 C).

Hot Working

Hot forming will reduce both the springback and required forming forces, and will increase the overall ductility of the material.

Cold Working

The cold working characteristics of this material are similar to those of austenitic stainless steels. In multiple forming operations, intermediate stress relieving is recommended to offset the alloy's tendency to work harden. Post-work annealing is required to re-attain optimum performance characteristics.

Annealing

Hold at 732 C(1350 F) between 1/4 and 4 hours, Furnace cool to 566 C(1050 F) then air cool. Furnace cooling is not required for forgings and bars.

Aging

Age at 538 C (1000 F) for 4 hours, air cool.

Other Physical Props

Beta Transus (F +/- 25) 1830

Physical Data

Density (lb / cu. in.)

0.16

Specific Gravity

4.43

Specific Heat (Btu/lb/Deg F - [32-212 Deg F])

0.135

Electrical Resistivity (microhm-cm (at 68 Deg F))

171

Melting Point (Deg F)

3200

Thermal Conductivity

3.9

Modulus of Elasticity Tension

16.5

Reduction of Area

25

Mechanical Data

Form

Sheet

Condition

Solution Annealed & Aged

Temper

70

Tensile Strength

130

Yield Strength

120

Elongation

10

Reduction of Area

25

Form

Sheet

Condition

Test Specimen Annealed

Temper

70

Form

Sheet

Condition

Test Specimen Annealed

Temper

600

Tensile Strength

100

Yield Strength

90

Elongation

17

Reduction of Area

52

Form

Sheet

Condition

Test Specimen Annealed

Temper

800

Tensile Strength

90

Yield Strength

75

Elongation

18

Reduction of Area

53

Form

Sheet

Condition

Test Specimen Annealed

Temper

1000

Tensile Strength

70

Yield Strength

60

Elongation

30

Reduction of Area

68