Ti-6Al-4V Purpose High Strength Alloy
Ti 6Al-4V offers a combination of high strength, light weight, formability, and corrosion resistance, which has made it the most commonly used titanium alloy. It is an alpha+beta alloy that is heat treatable to achieve moderate increases in strength and is recommended for use at service temperatures up to approximately 660°F (350°C).
Grade 5 Ti-6Al-4V alloy is fully heat treatable in sections measuring up to 15mm. It can be heated up to 400°C (750°F), and has good tensile properties at room temperature, creep resistance up to 325°C, and excellent fatigue strength.
Ti 6Al-4V may be considered in any application where a combination of high strength at low to moderate temperatures, light weight and excellent corrosion resistance are required.
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Machinability
Although tough, grade 5 Ti-6Al-4V alloy can be machined using the right quantity of coolant flow, slow speeds and high feed rates. High speed tools should be used for tooling this alloy and the recommended tool types are tungsten carbide designations C1-C4 or cobalt based.
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Forming
Grade 5 Ti-6Al-4V alloy can be hot or cold formed. The forming techniques include hydropress, stretch or drop-hammer.
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Welding
Weldability of grade 5 Ti-6Al-4V alloy is rated as fair.
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Annealing
Annealing can be performed by holding at 732°C (1350°F) between 1/4 and 4 h, then furnace cooled to 566°C (1050°F) followed by air cooling. In case of forgings and bars, furnace cooling is not required.
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Heat Treatment
Solution treatment of the material is done at 904-954°C (1660-1750° F) for 2 h, which is followed by water quench process.
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Forging
Rough forging of grade 5 Ti-6Al-4V alloy should be performed at 982°C(1800°F), and finished at 968°C (1750°F).
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Hot Working
Hot working enhances the overall ductility of the material.
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Cold Working
Cold working features of this material is same as that of a moderately tempered austenitic stainless steel. Post-work annealing is recommended to re- attain favorable performance properties.
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Aging
Aging of grade 5 Ti-6Al-4V alloy can be performed at 538°C (1000°F) for 4 h, and then air cooled.
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Applications
Grade 5 Ti-6Al-4V alloy is a popular titanium alloy and is widely used in several industries including aerospace, power generation, marine, and offshore industries.
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