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Meltio Invar 36

Product catalog summary

Overview: The Meltio Invar 36 datasheet provides detailed information about Invar 36, a nickel-iron alloy known for its low coefficient of thermal expansion and high dimensional stability. This makes it suitable for precision instruments, scientific devices, cryogenics, composite molds, and aerospace components.

Material Specifications:

Wire Density: 8.10 g/cm³
Melting Point: 1613 K (1340 ºC, 2445°F)
Wire Diameter: 1.0 mm
Weight on Spool: 15 kg
Volume on Spool: 1851 cm³
Spool Type: BS300
Wire Coating: Uncoated

Heat Treatment: Invar requires annealing after 3D printing to relieve residual stresses and improve mechanical properties. The process involves heating to 800ºC, holding for 1 hour, and slow cooling. Aging involves heating to 425ºC, holding for 2 hours, and cooling in the oven.

Deposition Parameters: Recommended 3D printing parameters include:

Laser Power: 1100 W
Velocity: 7.5 mm/s
Argon Flow: 10 l/min
Layer Height: 0.8 mm
Wire Speed: 7.64 mm/s
Energy Density: 183 J/mm³

Chemical Composition: The alloy consists of Fe, C (0.35%), Ni (36.0%), Mn (1.0%), Nb (2.5%), and Ti (1.0%).

Mechanical Properties: The datasheet compares the mechanical properties of Meltio's 3D printed Invar with conventional methods:

Ultimate Tensile Strength (UTS): 522 ± 14 MPa (Meltio) vs. 500 MPa (Wrought)
Yield Strength: 337 ± 22 MPa (Meltio) vs. 241 MPa (Wrought)
Elongation: 24 ± 2% (Meltio) vs. 31% (Wrought)
Hardness: 147 HV-30 (Meltio) vs. 127 HV-30 (Wrought)

Microstructure: The as-printed microstructure is heterogeneous and primarily austenite with nickel dissolving in γ-Fe. Computed tomography scans show no detectable voids or defects.

Disclaimer: The datasheet notes that specifications may change as research progresses and advises users to verify the suitability of the material for their applications.

Catalog excerpts

Meltio Material Datasheet Rev 2.0 Meltio Invar 36 Invar 36 /Alloy 36/1.3990 Invar is a type of nickel-iron alloy that is known for its unique properties, including low coefficient of thermal expansion and high dimensional stability over a wide range of temperatures. These characteristics make it a valuable material in various applications that require precision and stability, such as precision instruments, scientific measuring devices, cryogenics, composite molds and aerospace components.

Open the catalog to page 1

Meltio Material Datasheet Tomography Computed Tomography Scan of 3D printed sample part in Invar without detectable voids or defects. Resolution of 24 pm per pixel. Meltio Invar 36 Invar 36/Alloy 36/ 1.3990 Micrography The as printed microstructure of Invar is heterogeneous and mostly austenite with nickel dissolving in y-Fe. Relative density as 3D printed Mechanical Properties Results show that specimens printed using Meltio’s wire-laser metal 3D printed process perform at a high level when compared to samples made with conventional manufacturing methods. Testing is carried out in the less favorable...

Open the catalog to page 2

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