What Is DMLS for Titanium? - Complete Process Guide
Complete guide to Direct Metal Laser Sintering (DMLS) additive manufacturing for titanium alloys. Process capabilities, tolerances, surface finishes, lead times, cost ranges, and applications for additively manufactured titanium components.
Quick Answer
What is DMLS for titanium?
Direct Metal Laser Sintering (DMLS) is an additive manufacturing process that builds titanium components layer by layer from metal powder using a high-power laser. It enables the production of complex geometries, internal cooling channels, and lightweight lattice structures that cannot be manufactured through conventional subtractive methods.
Capability
DMLS offers unrivalled design freedom for titanium components. Key capabilities include:
- Complex internal geometries 鈥?conformal cooling channels, lattice structures, organic shapes
- Thin wall capability 鈥?down to 0.3 mm minimum wall thickness
- High material utilisation 鈥?<5% waste vs 80鈥?0% scrap in conventional machining
- Multiple parts per build 鈥?nested within build volume up to 400 x 400 x 400 mm
- Support structures 鈥?breakaway or soluble supports for overhangs >45掳
- Layer thickness 鈥?30 碌m (standard), 60 碌m (rapid), 20 碌m (high-resolution)
Tolerance
| Standard | Precision (post-machined) |
|---|---|
| 卤0.05 mm (as-built) | 卤0.02 mm |
| 卤0.002 mm/mm for features >100 mm | 卤0.005 mm |
| ISO 2768-m (as-built) | ISO 2768-f (post-machined) |
Critical mating surfaces typically require post-build CNC machining to achieve tight tolerances. DMLS is often paired with subtractive finishing for hybrid manufacturing.
Surface Finish
| As-built | Post-processed |
|---|---|
| 6鈥?0 碌m Ra (standard) | 0.4 碌m Ra (machined) |
| 3鈥? 碌m Ra (fine parameters) | 0.1 碌m Ra (polished/electropolished) |
As-built surfaces have characteristic roughness from partially sintered particles. Post-processing (CNC machining, polishing, electropolishing) is standard for functional surfaces.
Lead Time
| Phase | Duration |
|---|---|
| Prototype (1鈥?0 pcs) | 5鈥?0 business days |
| Low-volume (10鈥?0 pcs) | 2鈥? weeks |
| Production (50鈥?00+ pcs) | 4鈥? weeks |
| Express service | Available on request |
Build time depends on part height, volume, and number of parts per build. Complex lattice structures add significant scan time.
Cost Range
| Complexity | Typical Range (per part) |
|---|---|
| Simple geometry, small (<50 mm) | $200鈥?800 |
| Moderate (internal features, lattices) | $800鈥?3,000 |
| Complex (large, thin walls, intricate) | $3,000鈥?10,000+ |
| NRE (file preparation + build setup) | $500鈥?2,000 |
Cost factors: part volume and height (determines build time), material grade (Grade 23 powder costs more), post-processing requirements, and quantity (build nesting reduces per-part cost). Titanium powder cost is a significant contributor.
Recommended Materials
- Grade 5 (Ti-6Al-4V) 鈥?Aerospace brackets, lightweight structural components, custom tooling
- Grade 23 (Ti-6Al-4V ELI) 鈥?Medical implants (custom patient-specific), surgical guides, Class II/III devices
Both materials are widely qualified for DMLS. Grade 23 is preferred for medical implant applications due to its improved fracture toughness.
Applications
- Custom patient-specific medical implants (orthopaedic, cranial, spinal)
- Aerospace lightweight brackets and ducting with organic optimisation
- Complex cooling channels for injection mould tooling and hot-runner systems
- Lightweight lattice structures for weight-critical components
- Prototype titanium parts for functional testing
- Low-volume production of complex geometries uneconomical to cast or machine
- Medical surgical guides and custom instrumentation