EOS Nickel Alloy IN718 is a nickel based heat resistant alloy.
Its composition corresponds to UNS N07718, AMS 5662, AMS 5664, W.Nr 2.4668, DIN NiCr19Fe19NbMo3.
Ni (50 – 55 wt-%)     Co (<= 1.0 wt-%)
Cr (17.0 – 21.0 wt-%)     Cu (<= 0.3 wt-%)
Nb (4.75 – 5.5 wt-%)     C (<= 0.08 wt-%)
Mo (2.8 – 3.3 wt-%)     Si, Mn (each <= 0.35 wt-%)
Ti (0.65 – 1.15 wt-%)     P, S (each <= 0.015 wt-%)
Al (0.20 – 0.80 wt-%)     B (<= 0.006 wt-%)
Fe (balance)
Physical Properties
This nickel-chromium alloy hardens on precipitation. It is characterized by having good tensile, fatigue, creep and rupture strength at temperatures up to 700°C. The alloy also has outstanding corrosion resistance in various corrosive environments. Possesses excellent cryogenic properties.
Parameter As Built (typical, heated at 20⁰C) After Age-Hardening
Tensile Strength XY: 1060 ± 50 MPa; Z: 980 ± 50 MPa min. 1241 MPa ; typ. 1400 ± 100 MPa
Yield Strength XY: 780 ± 50 MPa; Z: 634 ± 50 MPa min. 1034 MPa ; typ. 1150 ± 100 MPa
Elongation at Break XY: (27 ± 5) %; Z: (31 ± 5 ) % min. 12 % typ. (15 ± 3) %
Modulus of elasticity 160 ± 20 GPa 170 ± 20 GPa
Hardness approx. 30 HRC approx. 47 HRC
Other Properties
Coefficient of thermal expansion approx. 12.5 – 17.2 x 10-6 m/m°C
Oxidation resistance approx. 980 °C
Max operating temp approx. 650 °C
Density min. 8.15 g/cm³
Relative Density Approx. 100%
3D Printing Details
Technology
DMLS
Possible Post Processing
machined, spark-eroded, welded, micro shot-peened, polished and coated
Accuracy
40 – 60 Microns(for small parts)
Min Wall Thickness 0.3-0.4 mm
Min Layer Resolution 40 Microns
Volume Rate
4 mm³/s
Surface Roughness Ra: 4-6.5 Microns ; Rz: 20-50 Microns
Applications
For applications which require high temperature
- Functional prototypes
- Series-production parts
- Aerospace
- Industry (e.g. high-temperature turbine components, instrumentation parts, power and process industry parts etc.)
- Cryogenic applications
Design Guidelines
Min Wall Thickness 0.3-0.4 mm
Min Layer Resolution 20 Microns
Min Detail Size 0.8 mm
Min Hole Diameter 0.8 mm
Min Text Size 2.5 mm
Max Part Dimension 300 mm
Gallery
Physical Properties
This nickel-chromium alloy hardens on precipitation. It is characterized by having good tensile, fatigue, creep and rupture strength at temperatures up to 700°C. The alloy also has outstanding corrosion resistance in various corrosive environments. Possesses excellent cryogenic properties.| Parameter | As Built (typical, heated at 20⁰C) | After Age-Hardening |
|---|---|---|
| Tensile Strength | XY: 1060 ± 50 MPa; Z: 980 ± 50 MPa | min. 1241 MPa ; typ. 1400 ± 100 MPa |
| Yield Strength | XY: 780 ± 50 MPa; Z: 634 ± 50 MPa | min. 1034 MPa ; typ. 1150 ± 100 MPa |
| Elongation at Break | XY: (27 ± 5) %; Z: (31 ± 5 ) % | min. 12 % typ. (15 ± 3) % |
| Modulus of elasticity | 160 ± 20 GPa | 170 ± 20 GPa |
| Hardness | approx. 30 HRC | approx. 47 HRC |
Other Properties
| Coefficient of thermal expansion | approx. 12.5 – 17.2 x 10-6 m/m°C |
| Oxidation resistance | approx. 980 °C |
| Max operating temp | approx. 650 °C |
| Density | min. 8.15 g/cm³ |
| Relative Density | Approx. 100% |
3D Printing Details
| Technology | DMLS |
|---|---|
| Possible Post Processing | machined, spark-eroded, welded, micro shot-peened, polished and coated |
| Accuracy | 40 – 60 Microns(for small parts) |
| Min Wall Thickness | 0.3-0.4 mm |
| Min Layer Resolution | 40 Microns |
| Volume Rate | 4 mm³/s |
| Surface Roughness | Ra: 4-6.5 Microns ; Rz: 20-50 Microns |
Applications
For applications which require high temperature- Functional prototypes
- Series-production parts
- Aerospace
- Industry (e.g. high-temperature turbine components, instrumentation parts, power and process industry parts etc.)
- Cryogenic applications
Design Guidelines
| Min Wall Thickness | 0.3-0.4 mm |
| Min Layer Resolution | 20 Microns |
| Min Detail Size | 0.8 mm |
| Min Hole Diameter | 0.8 mm |
| Min Text Size | 2.5 mm |
| Max Part Dimension | 300 mm |
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