When to pick this combination
DMLS IN718 is the EOS-machine cousin of L-PBF IN718, with the same allowables and recipe but a different installed-base — pick it when an EOS M290/M400 is in your supply chain.
- Service 425–650 °C
- Fatigue-driven margins
- EOS-qualified supplier base
- Legacy AMS 5663 reorders
Typical defects and how the model accounts for them
As-built DMLS IN718 shows 0.3–0.7 % porosity, lack-of-fusion at vector transitions, and 5–10 % anisotropy between vertical and horizontal pulls. Walker-corrected fatigue with MMPDS-2024 scatter applies identically to L-PBF.
Required post-processing
The allowables above assume the full post-processing chain. Skipping any step degrades the row by 15–35 %.
- Stress relief: 1065 °C / 90 min / Ar
- EDM from plate
- HIP: 1163 °C / 100 MPa / 4 h
- Solution: 980 °C / 1 h / AC
- Age: 720 °C / 8 h → 620 °C / 8 h, FC
- Machine critical interfaces
Suggested build parameters
Starting recipe; tune against first-article inspection on geometry-sensitive features.
- Layer: 40 μm
- Laser: 285 W
- Scan speed: 960 mm/s
- Hatch: 110 μm
- Build plate: 80 °C
Frequently asked questions
Is DMLS IN718 interchangeable with L-PBF IN718?
For allowables purposes, yes — the underlying physics is identical. The procurement and parameter qualification path differs because DMLS implies an EOS machine and EOS-published parameter set.
Sources
- AMS 5663 — Inconel 718, bar/forging/ring/drawn shapes
- MMPDS-2024 §9 AM data submission requirements