ARCAM
  
– Arcam Ti6Al4V ELI (Grade 23)
Arcam Ti6Al4V ELI (Grade 23) 

General characteristics

The high strength, low weight ratio and outstanding corrosion

resistance inherent to titanium and its alloys has led to a

wide and diversified range of successful applications which

demand high levels of reliable performance in surgery and

medicine as well as in aerospace, automotive, chemical plant,

power generation, oil and gas extraction, sports, and other

major industries.

In the majority of these and other engineering applications,

titanium replaces heavier, less serviceable or less cost-effective

materials. Designs made using the properties provided by

titanium often result in reliable, economic and more durable

systems and components. These titanium components often

substantially exceed performance and service life expectations

at a lower overall cost.

Titanium is available in several different grades. Pure titanium

is not as strong as the different titanium alloys are. Ti6Al4V is

the most widely used titanium alloy. It features good machinability

and excellent mechanical properties. The alloy offers

the best all-round performance for a variety of weight reduction

applications in aerospace, automotive and marine equipment.

Ti6Al4V also has numerous applications in the medical

industry. The biocompatibility of Ti6Al4V is excellent,

especially when direct contact with tissue or bone is required.

Arcam EBM system

Special characteristics

Ti6Al4V ELI (Grade 23) is very similar to Ti6Al4V (Grade 5),

except that Ti6Al4V ELI contains reduced levels of oxygen,

nitrogen, carbon and iron. ELI is short for Extra Low Interstitials,

and these lower interstitials provide improved ductility

and better fracture toughness for the Ti6Al4V ELI material.

Applications

Ti6Al4V ELI is typically used for:

Biomedical implants

Aerospace components

Cryogenic applications

Offshore equipment

The alloys high resistance to

stress corrosion cracking (SCC)

in sea water makes Ti6Al4V ELI

an obvious choice in applications

that require both high strength

and corrosion resistance.

Powder specification

The Arcam Titanium Ti6Al4V ELI (Grade 23) is a gas-atomized

powder with a particle size between 45 and 100 microns. This

limit on the minimum particle size ensures safe handling of

the powder.

Please refer to the Arcam MSDS (Material Safety Data Sheet)

for more information about the handling and safety of the

Arcam Ti6Al4V ELI alloy.

POST PROCESSING

Heat treatment

Hot Isostatic Pressing (HIP) is recommended for fatigue-loaded

components. The following HIP parameters are recommended:

920 C

1000 bar

120 minutes

Machining

Ti6Al4V ELI parts manufactured in the EBM process feature

good machinability and can be machined without additional

operations.

The following factors contribute to efficient machining of

Ti6Al4V ELI parts:

Low cutting speeds

High feed rate

Generous quantities of cutting fluid

Sharp tools

Rigid setup

Welding

Ti6Al4V ELI may be welded by a wide variety of conventional

fusion and solid-state processes, although its chemical reactivity

typically requires special measures and procedures

Microstructure

Ti6Al4V ELI parts manufactured in the EBM process have a microstructure better than cast Ti6Al4V ELI

containing a lamellar α-phase with larger β-grains, and with a higher density and significantly finer grain,

thanks to the rapid cooling of the melt pool.

The build chamber is kept at an elevated temperature throughout the entire build process, and the material

therefore comes out of the EBM process in a naturally aged condition

Arcam
 
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