When to pick DMLS over generic L-PBF
DMLS is the EOS-branded variant of L-PBF. The physics are identical; what differs is the OEM-qualified parameter set, the installed base, and the supply chain for build cards. For Ti-6Al-4V the EOS recipe library is the deepest in the industry, which translates into shorter parameter qualification on production parts.
Pick DMLS when your part will be built on an EOS M 290 / M 400 fleet, or when downstream qualification leans on EOS-published allowables.
- EOS-fleet production environments
- Parts inheriting EOS-published material property cards
- Service bureaus that bid on OEM-qualified DMLS parameters
Defects and post-processing
Defect modes match L-PBF Ti-6Al-4V: gas porosity, lack-of-fusion, columnar prior-β grains, and Z-vs-XY anisotropy of 8–12 %. ForgeCast applies the same Walker correction and scatter band as the L-PBF variant.
Post-processing is identical: stress-relief, wire EDM from plate, HIP at 920 °C / 100 MPa / 2 h, surface finish on critical interfaces.
Suggested DMLS parameters
Starting recipe on EOS M 290 with 30 µm layer.
- Layer thickness: 30 µm
- Laser power: 280 W
- Scan speed: 1200 mm/s
- Hatch spacing: 140 µm
- Build atmosphere: argon, O₂ < 50 ppm
- Pre-heat: 200 °C plate
Frequently asked questions
Is DMLS really different from L-PBF?
Mechanically, no — both fuse metal powder layer-by-layer with a laser. 'DMLS' is the EOS trademark; the qualification ecosystem and parameter library are what you actually pay for.
Can I move a part from one DMLS machine to another without re-qualifying?
Across EOS machines of the same model and parameter set, yes for most non-critical parts. For flight or implant work, every machine + parameter combination is qualified independently.
Sources
- EOS Ti64 Material Datasheet (M 290, M 400)
- ASTM F3001 — AM Ti-6Al-4V ELI
- MMPDS-2024 Chapter 5