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.
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).
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.
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.
Rated as “fair” in terms of weldability.
Solution treat at 904-954 C(1660-1750 F) for 2 hours followed by water quench.
Rough forge at 982 C(1800 F), finish at @ 968 C (1750 C).
Hot forming will reduce both the springback and required forming forces, and will increase the overall ductility of the material.
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 requ
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.
Age at 538 C (1000 F) for 4 hours, air cool.
Other Physical Properties
Beta Transus (F +/- 25) 1830
Specific Gravity: 4.43
Specific Heat: 0.135
Electrical Resistivity: 171
Melting Point: 3200
Thermal Conductivity: 3.9
Reduction Of Area: 25
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