DMLS Materials - Technical Specifications

Technical Data
Mechanical properties at 20 o C
(vertical position)
DMLS Materials - Technical Specification
Inconel 718 (EOS 718 Alloy)
As built After heat-treatment 1 After heat-treatment 2
Ultimate tensile strength (MPIF 10) 980 MPa + 50 MPa 1400 MPa + 100 MPa 1384 MPa + 100 MPa
Yield strength (Rp 0.2%) 634 MPa + 50 MPa 1150 MPa + 50 MPa 1239 MPa + 100 MPa
Elongation at break 31% + 3% 15% + 3% 15% + 3%
Young’s Modulus
170 GPa + 20 GPa
Hardness ~ 30 HRC ~ 47 HRC ~ 43 HRC
Surface roughness
- after shot-peening
- after polishing
Thermal properties
Thermal conductivity (at 20°C)
Specific heat capacity
R a
4 - 6.5 µm
R
z
up to < 0.5 µm
TBC
TBC
Maximum operating temperature Under load 650°C
Oxidation resistance up to 980°C
Typical applications
• Aero and land based turbine engine parts.
• Rocket and space application components.
• Chemical and process industry parts.
• Oil well, petroleum and natural gas industry parts.
Physical & Chemical properties
Minimum recommended layer thickness 20 µm Relative density with standard parameters approx. 100% (8.2 g/cm 3 )
Minimum wall thickness 0.4 mm Material composition:
Volume rate 2 mm 3 /s
Age hardening shrinkage*
TBC
Ni
Cr
Fe
50-55 wt%
17-21 wt%
11.13-24.6 wt%
1
Age heat-treatment according to AMS5662:-
Step1. Solution Anneal at 980°C for 1 hour, air (/argon) cool.
Step 2. Ageing treatment; hold at 720°C 8 hours, furnace cool to 620°C in 2 hours, hold at 620°C 8 hours, air(/argon) cool.
2
Age heat-treatment according to AMS5664:-
Step1. Solution Anneal at 1065°C for 1 hour, air (/argon) cool.
Step 2. Ageing treatment; hold at 760°C 10 hours, furnace cool to 650°C in 2 hours, hold at 650°C 8 hours, air(/argon) cool.
Nb
Mo
Ti
Mn, Si - each max 0.35 wt%
4.75-5.5 wt%
2.8-3.3 wt%
0.65-1.15 wt%
Al 0.2-0.8 wt%
Co max 1 wt%
B max 0.006 wt%
P, S - each max 0.015 wt%
Under normal process conditions, all the parts will be built using Argon.
Source: EOS