Metal additive manufacturing has crossed the line from novelty to necessity in Indian industry. Aerospace programmes demand titanium brackets with complex internal lattices. Medical device OEMs need stainless steel surgical instruments in patient-specific geometries. Defence electronics require Inconel heat exchangers that would take eight weeks in machining and four days in DMLS. Layer X operates DMLS in-house with AS9100 and ISO 13485 certification.
How DMLS Works
Direct Metal Laser Sintering (also called DMLM or SLM by different machine vendors) uses a high-power fibre laser to fuse metal powder in a thin layer (20–60 µm). The bed indexes down, a recoater spreads fresh powder, and the laser traces the next cross-section. After hundreds of layers, a solid metal part emerges from the powder bed with mechanical properties comparable to wrought stock.
Materials at Layer X
316L Stainless Steel: Corrosion resistance, food-grade, biocompatible (not implant-grade). Yield strength 450–500 MPa as-built. Used for chemical processing, food machinery, and general industrial applications. From ₹5,000/part.
17-4 PH Stainless Steel: Precipitation-hardenable to 1,200 MPa UTS in H900 condition. Used for aerospace fasteners, pump shafts, and valves.
Ti-6Al-4V (Grade 5 Titanium): Outstanding specific strength (strength-to-weight). Yield 910 MPa at 4.4 g/cm³. Biocompatible and ASTM F2924 qualified. Used for aerospace structures, orthopaedic implant positives, and satellite brackets. Build volume 250×250×325 mm.
H13 Tool Steel: Hardness up to 53 HRC after heat treatment. Used for injection mould tooling with conformal cooling channels — improving cycle time by 20–35% versus conventional drilled cooling.
Inconel 718: Retains strength above 700 °C. Used for gas turbine components, heat exchangers, rocket propulsion nozzles, and defence thermal management systems.
Tolerances and Surface Finish
Standard DMLS tolerance is ±0.1 mm for features above 10 mm. Features below 5 mm hold ±0.05 mm with careful orientation. As-built surface finish is Ra 4–8 µm depending on orientation (upfacing surfaces finer, downskin coarser). Post-machining achieves Ra ≤0.8 µm on critical bearing surfaces.
Support Removal and Post-Machining
DMLS parts are built on a steel plate and require support structures for overhangs below 45°. Support removal is included in the Layer X quote. Critical surfaces are CNC post-machined to drawing in our partner machining facility. All DMLS deliveries include dimensional inspection data.
Lead Times
Standard DMLS: 5–7 business days for most geometries under 10,000 cm³ build volume. Complex multi-material or multi-part builds: 8–12 days. Expedited 3-day service available for aerospace and defence customers with a written programme justification.
Is DMLS Right for Your Application?
DMLS makes economic sense when: the geometry cannot be machined (internal channels, lattices), the material is expensive (titanium billet waste is eliminated), or the volume is 1–50 parts (below injection moulding break-even). For >100 identical parts, investment casting or machined tooling usually wins on cost. Upload your STEP file at layerx3d.in and compare all available processes.