Process Data Sheet

EOS Aluminium AlSi10Mg for EOS M 290 | 30 µm

EOS M 290 - 30 µm - TRL 9

Process Information Metal

High performance process with smooth and shiny surfaces. Process is developed to have high density
with smooth vertical surfaces. T6 heat treatment enables excellent elongation with moderate strength and reduced anisotropy.

 

Main Characteristics:
→ Good mechanical properties and low amount of defects.
→ Shiny and smooth surfaces on vertical areas.
→ Mechanical properties can be modified with heat treatment.

System Setup EOS M 290
EOS Material set AlSi10Mg_FlexM291 2.01
Recoater Blade HSS (High Speed Steel)
Build Platform Temperature 35 °C
Nozzle Standard
Inert gas Argon
Sieve 90 µm
Additional Information
Layer Thickness 30 µm
Volume Rate 5.1 mm³/s
Wall Thickness 0.4 mm

Chemical and Physical Properties of Parts

The chemical composition of the EOS Aluminium AlSi10Mg parts is in compliance with DIN EN 1706 (EN AC—43000) and ASTM F3318-18 standards.

As manufactured
As manufactured and etched according to internal procedure using Groesbeck reagent
Heat treated
Heat treated and etched according to internal procedure using Groesbeck reagant

Microstructure of the Produced Parts

Defects Thickness Result Number of Samples
Average Defect Percentage 30 µm 0.04 % -
Density EN ISO 3369 Thickness Result Number of Samples
Average Density 30 µm ≥ 2.67 g/cm³ -

Mechanical Properties

Mechanical Properties Heat Treated

EN ISO 6892-1 Room Temperature | 30 µm Yield Strength [MPa] Tensile Strength [MPa] Elongation at Break A [%] Reduction of Area Z [%] Modulus of elasticity [GPa] Number of Samples
Vertical 250 310 11 - - -
Horizontal 260 320 11 - - -

EOS T6 Heat Treatment

EOS has developed an AM optimized heat treatment procedure that is 40 % shorter than conventional T6 heat treatment procedures.
Solution annealing 30 min @ 530 °C, water quench. Artificial aging 6 h @ 165 °C, cooling in air. Parts to preheated oven. Maximum overheating 5 °C. Delay between SA and quenching maximum 30 s. Oven type & configuration may have impact on the mechanical properties. For complex and massive parts uniform heating and cooling needs to be arranged.

EOS T6 treatment is recommended to obtain controlled mechanical properties and lower variation in mechanical values (for example in long build jobs if heat transfer from parts is limited by low amount of support and after stress relief heat treatment).

An increase in porosity due to heat treatment is possible. A more detailed description of heat treatment is available upon request.

Solution Annealing:
30 minutes in 530 °C followed by immediate quenching to water.

Aging:
Artificial aging of 6 hours in 165 °C followed by cooling in air.

In case higher build platform temperature is used it is strongly advised to perform EOS T6 heat treatment in order to obtain mechanical properties similar to those stated in the MDS.

Mechanical Properties As Manufactured

EN ISO 6892-1 Room Temperature | 30 µm Yield Strength [MPa] Tensile Strength [MPa] Elongation at Break A [%] Reduction of Area Z [%] Modulus of elasticity [GPa] Number of Samples
Vertical 233 466 6.3 - - -
Horizontal 270 461 10.2 - - -
The testing was done according to ISO 6892-1, B10. Machined (turned) samples were used. T99: One-sided (lower bound) Tolerance Interval provides limit above which 99% of the population falls with 95% level of confidence. Tolerance intervals are based on e.g validation data / QA statistics.

Hardness

EN ISO 6506 As Manufactured
Value 114 HBW
Unit HBW2.5/62.5
EN ISO 6506 Heat Treated
Value 105
Unit HBW 2.5/62.5

Fatigue

As Manufactured
Fatigue strength [MPa] 110

HCF, ASTM E466-15, 20 million cycles, turned, fully reversed.

High cycle fatigue testing performed on machined vertical and horizontal samples. No heat treatment. A

luminum alloys do not have fatigue limit. Actual fatigue values depend on sample geometry and specially surface finish.

Thermal Conductivity

EN ISO 22007-2 Orientation [W/m*K]
As Manufactured Vertical 100
As Manufactured Horizontal 110
EN ISO 22007-2 Orientation [W/m*K]
Heat Treated Vertical 165
Heat Treated Horizontal 155

EOS T6 Heat treatement

EN ISO 22007-2 Orientation [W/m*K]
Stress-relieved Vertical 160
Stress-relieved Horizontal 165

Surface Roughness

Typical gas tightness with helium leak test (2 mm wall thickness)

EN 13185:2001
Value

10*6
Unit

mbar l/s

Electrical Conductivity

ASTM E1004-17 Orientation Typical Electrical Conductivity [%IACS]
As Manufactured | 30 µm | Horizontal 25
ASTM E1004-17 Orientation Typical Electrical Conductivity [%IACS]
Heat Treated | 30 µm | Horizontal 44

EOS T6 Heat treatement

ASTM E1004-17 Orientation Typical Electrical Conductivity [%IACS]
Stress-relieved | 30 µm | Horizontal 44

Coefficient of Thermal Expansion

ASTM E228 Temperature
20*10-6/K 25 – 100 ºC
22*10-6/K 25 – 200 ºC
27*10-6/K 25 – 300 ºC
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