EOS NickelAlloy IN718

Material Data Sheet

High Temperature Strength and Corrosion Resistance

EOS NickelAlloy IN718 is a precipitation-hardening nickel-chromium alloy that is characterized by having good tensile, fatigue, creep and rupture strength at temperatures up to 700 °C (1290 °F). Parts built from EOS NickelAlloy IN718 can be easily post-hardened by precipitation-hardening heat treatments.

EOS NickelAlloy IN718 is a nickel alloy powder intended for manufacturing parts on EOS metal systems with EOS DMLS processes.

MAIN CHARACTERISTICS

Good tensile, fatigue, creep and rupture strength at temperatures up to 700 °C (1 290 °F)
Parts are easily precipitation hardened
Parts can be machined, spark-eroded, welded, micro shot-peened, polished and coated in both as-built and age-hardened states

TYPICAL APPLICATIONS

Gas turbine components
Instrumentation parts
Power industry parts
Process industry parts

The EOS Quality Triangle

EOS uses an approach that is unique in the AM industry, taking each of the three central technical elements of the production process into account: the system, the material and the process. The data resulting from each combination is assigned a Technology Readiness Level (TRL) which makes the expected performance and production capability of the solution transparent.

EOS incorporates these TRLs into the following two categories:

Premium products (TRL 7-9): offer highly validated data, proven capability and reproducible part properties.
Core products (TRL 3 and 5): enable early customer access to newest technology still under development and are therefore less mature with less data.

All of the data stated in this material data sheet is produced according to EOS Quality Management System and international standards

POWDER PROPERTIES

The chemical composition of EOS NickelAlloy IN718 is in compliance with UNS N07718, AMS 5662, AMS 5664, W.Nr 2.4668, DIN NiCr19Fe19NbMo3.

Powder Chemical Composition (wt.-%)

Element	Min.	Max.
Fe	Balance
Ni	50	55
Cr	17	21
Nb	4.75	5.5
Mo	2.8	3.3
Ti	0.65	1.15
Al	0.2	0.8
Co	-	1
Cu	-	0.3
Si	-	0.35
Mn	-	0.35
Ta	-	0.05
C	-	0.08
S	-	0.015
P	-	0.015
B	-	0.006
Pb	-	0.0005
Se	-	0.002
Bi	-	0.00003

Powder Particle Size

GENERIC PARTICLE SIZE DISTRIBUTION	20 - 55 μm

SEM micrograph of EOS NickelAlloy IN718 powder

HEAT TREATMENT

Description

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

Steps

Step 1: Solution Annealing: hold at 954 °C (1 750 °F ) for 1 hour per 25 mm (0.98 inch) of thickness, air (/argon) cool

Step 2: Ageing Treatment: hold at 718 °C (1 325 °F ) 8 hours, furnace cool to 621 °C (1 150 °F ) and hold at 621 °C (1 150 °F ) for total precipitation time of 18 hours, air (/argon) cool

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