Process Information Metal
This process parameter includes two variations of the exposure set: the first one provides better productivity while the second one enables low angle buildability down to 20°. The low angle buildability can be optimized further through the part geometry and the length of overhang.
| System Setup | EOS M 400-4 |
|---|---|
| EOS Material set | IN718_040_080_HiProM404 |
| Powder Product No. | 9011-0020 / 9030-0022 |
| Software Requirements |
EOSPRINT 2.11 or newer EOSYSTEM 2.15 or newer |
| Recoater Blade | HSS (High Speed Steel) |
| Nozzle | EOS Aerospike Nozzle |
| Inert gas | Argon |
| Sieve | 63 µm |
| Additional Information | |
|---|---|
| Layer Thickness | 40 µm |
| Volume Rate | up to 4 x 5.2 mm³/s |
| Min. Wall Thickness | typical 0.3 - 0.4 mm |
Chemical and Physical Properties of Parts
Microstructure of the Produced Parts
| Defects | Thickness | Result | Number of Samples |
|---|---|---|---|
| Average Defect Percentage | 40 µm | 0.01 % | - |
| Density EN ISO 3369 | Thickness | Result | Number of Samples |
|---|---|---|---|
| Average Density | 40 µm | ≥ 8.21 g/cm³ | - |
Mechanical Properties
Mechanical Properties Heat Treated
| EN ISO 6892-1 Room Temperature | 40 µm | Yield Strength [MPa] | Tensile Strength [MPa] | Elongation at Break A [%] | Reduction of Area Z [%] | Modulus of elasticity [GPa] | Number of Samples |
|---|---|---|---|---|---|---|
| Vertical | 1170 | 1410 | 15 | - | - | - |
| Horizontal | 1240 | 1490 | 13 | - | - | - |
Heat treatment procedure conform to Aerospace Material Specification AMS 2774 and AMS 5662.
As manufactured microstructure for additively manufactured IN718 consists of gamma phase (γ). Heat treatment for IN718 is required to produce desired microstructure and part properties (gamma double prime precipitates, γ"). Heat treatment is also used to relieve stresses.
Step 1:
Solution Anneal: hold at 954 °C (1750 °F ) for 1 hour per 25mm (0.98 inch) of thickness, air (/argon) cool
Step 2:
Ageing treatment; hold at 718 °C (1325 °F ) 8 hours, furnace cool to 621 °C (1150 °F ) and hold at 621 °C (1150 °F ) for total precipitation time of 18 hours, air (/argon) cool
Mechanical Properties As Manufactured
| EN ISO 6892-1 Room Temperature | 40 µm | Yield Strength [MPa] | Tensile Strength [MPa] | Elongation at Break A [%] | Reduction of Area Z [%] | Modulus of elasticity [GPa] | Number of Samples |
|---|---|---|---|---|---|---|
| Vertical | 630 | 970 | 30 | - | - | - |
| Horizontal | 770 | 1060 | 26 | - | - | - |
Hardness
| EN ISO 6507 Heat Treated | |
|---|---|
| Value | 463 |
| Unit | HV |
Stress Rupture Performance
| ASTM E292 Heat Treated | Stress [MPa] | Temperature [°C] | Time to Rupture [hrs] | Elongation [%] | RA [%] |
|---|---|---|---|---|---|
| Vertical | 689 | 650 | 53 | 5 | 20.05 |
The stress-rupture performance of EOS NickelAlloy IN718 was tested on vertically oriented samples, in heat-treated condition. No HIP was applied. The data presents the Larson-Miller parameter values achieved at stress levels of 689 MPa.
Surface Roughness
Stress Rupture Performance
| Surface Roughness | From | To |
|---|---|---|
| Sa (µm) | - | - |
| Ra (µm) | - | - |
