Laser Powder Bed Fusion (LPBF) Providers
Laser Powder Bed Fusion is the umbrella term for metal AM processes that selectively melt thin layers of powder using a laser. LPBF delivers fine feature resolution and tight tolerances, making it ideal for complex internal channels, lattice structures, and lightweight aerospace brackets. Find LPBF providers on ForgedLink with verified capabilities across titanium, Inconel, aluminium, and stainless steel alloys.
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How Laser Powder Bed Fusion works
LPBF builds metal parts one layer at a time inside a sealed chamber filled with inert gas (typically argon for reactive alloys, nitrogen for stainless and aluminium). A high-power fibre laser selectively melts a 20–100 micron layer of fine metal powder, the build plate lowers, a recoater spreads fresh powder, and the cycle repeats. Layer thicknesses of 30–60 microns are typical for production work; thinner layers give finer surface finish at the cost of build time.
The process produces near-fully-dense parts (typically >99.5% of wrought density) with mechanical properties broadly comparable to wrought equivalents after appropriate heat treatment. Dimensional tolerances of ±0.1 to ±0.2 mm are achievable on well-controlled machines, with feature resolution down to ~0.4 mm wall thickness. Most production parts require post-processing — stress-relief heat treatment, support removal, HIP for fatigue-critical applications, and CNC machining of mating surfaces.
Common LPBF applications
Aerospace structural brackets
Topology-optimised brackets in Ti-6Al-4V or Scalmalloy that consolidate 5–20 machined parts into a single LPBF assembly, cutting weight by 30–50% on flight hardware.
Conformal cooling for tooling
Injection-mould inserts in maraging steel or H13 with conformal cooling channels that reduce cycle times by 20–40% versus straight-drilled cooling.
Hydraulic and fluid manifolds
Single-piece manifolds with internal flow paths optimised for pressure drop, replacing welded or O-ring assemblies prone to leak paths.
Medical and orthopaedic implants
Patient-specific cranial plates, spinal cages, and acetabular cups in Ti-6Al-4V ELI with engineered porous lattice for osseointegration.
Heat exchangers
Compact aluminium or copper-alloy heat exchangers with internal lattice or TPMS structures that triple surface area within a fixed envelope.
F1 and motorsport hardware
Lightweight uprights, pedal boxes, and turbo housings in Ti or Inconel with full traceability to FIA technical regulations.
Materials commonly processed by LPBF
Ti-6Al-4V (Grade 5 / Grade 23 ELI)
The most widely processed LPBF titanium. Grade 23 (extra-low interstitials) is required for medical implants. Always specify HIP for fatigue-critical applications.
Inconel 718 / 625
Nickel superalloys for high-temperature service up to ~700°C (718) and corrosion-resistant applications (625). Double-stage heat treatment is essential to achieve target tensile properties.
AlSi10Mg
The default LPBF aluminium alloy — castable composition adapted for AM. Good strength-to-weight, but not suitable for service above ~200°C. Scalmalloy and AlMgScZr are higher-performance alternatives.
Stainless 316L / 17-4 PH
316L for corrosion resistance, marine and food-contact applications. 17-4 PH for higher-strength precipitation-hardened parts after H900/H1025 heat treat.
Maraging Steel (1.2709 / M300)
Tool-steel grade widely used for conformal-cooled mould inserts. Achieves ~50 HRC after age hardening and machines well in the as-built state.
CoCrMo
Cobalt-chrome for dental crowns, bridges, and orthopaedic wear surfaces. Requires ISO 13485 chain of custody for medical use.
When to choose LPBF over DMLS, EBM, DED, or Binder Jetting
LPBF vs DMLS: these are the same process under different vendor branding (EOS coined "DMLS"; "SLM" is a separate trademark by SLM Solutions). If you see them listed as separate capabilities, treat them as equivalent for sourcing purposes — what matters is the specific machine platform, alloy parameter set, and post-processing chain the provider runs.
LPBF vs EBM: choose EBM for thick-section titanium where in-process stress relief matters (build chamber runs at 700°C+), or for pure-titanium implants where electron-beam vacuum environment avoids the alpha-case risk of laser processes. Choose LPBF for finer surface finish, broader material range, and tighter feature resolution.
LPBF vs DED: LPBF wins on geometric complexity, tolerance, and surface finish for parts under ~500 mm. DED is the right call for parts over a metre, repair work, or when build envelope is the limiting factor.
LPBF vs Binder Jetting: LPBF gives wrought-like mechanicals out of the printer; binder-jetted metal parts must be sintered, with shrinkage and density limits. For volumes above ~500 units in 316L or 17-4 PH, binder jetting is usually more economic; below that, LPBF is competitive.
Lead time and cost expectations for LPBF
First-article LPBF parts in standard alloys typically deliver in 2–4 weeks from order — longer if HIP, secondary heat treat, or CNC finishing is required. Cost scales primarily with build height and supported volume rather than part count, so nesting multiple parts in one build dramatically reduces unit cost.
Indicative pricing for a 100 cm³ Ti-6Al-4V part (single, supported, basic stress relief): £900–£1,400 / €1,050–€1,650. Stainless 316L runs roughly half that, AlSi10Mg slightly less. Inconel 718 is the most expensive common alloy due to powder cost and longer build times. The economic sweet spot for LPBF is 1–200 units; beyond that, binder jetting, MIM, or investment casting usually undercut on per-part cost.
Related processes & materials
Frequently asked questions
What is the difference between LPBF, SLM, and DMLS?
They describe the same fundamental process — selectively melting metal powder in a bed using a laser. "DMLS" is EOS's trademark, "SLM" was originally trademarked by SLM Solutions, and "LPBF" is the ISO/ASTM 52900 vendor-neutral term. For sourcing purposes, treat them as interchangeable; what matters is the machine platform, parameter set, and qualification status of the provider.
What tolerances are achievable with LPBF?
As-built dimensional tolerance is typically ±0.1 to ±0.2 mm on dimensions under 100 mm, ±0.3 mm on larger features. Surface roughness is 6–12 µm Ra in the as-built condition, depending on orientation. Tighter tolerances and smoother surfaces require CNC finishing of critical features after print.
Do LPBF parts need heat treatment?
Yes — almost always. Stress-relief heat treatment is essential before removing parts from the build plate to avoid distortion and cracking. Many alloys (Ti-6Al-4V, Inconel 718, 17-4 PH) also require a solution + age cycle to achieve target mechanical properties. HIP (Hot Isostatic Pressing) is standard for fatigue-critical parts to close internal porosity.
What is the maximum build size for LPBF?
Standard production machines have build envelopes of around 250 × 250 × 300 mm (e.g. EOS M290) to 400 × 400 × 400 mm (e.g. SLM 500, EOS M400). Large-format LPBF systems (e.g. SLM NXG XII 600, EOS M450) reach 600 mm or more in plan dimension. For parts above this envelope, DED, WAAM, or binder jetting are usually more cost-effective.
How dense are LPBF parts?
A well-qualified LPBF process produces parts at 99.5–99.9% of theoretical density. HIP can take this above 99.95% by closing residual gas porosity. For load-bearing aerospace and medical parts, density is typically verified by Archimedes density measurement plus CT scanning of first-article parts.
Which industries use LPBF most heavily?
Aerospace and defence (structural brackets, fuel system components), medical (implants, surgical instruments), motorsport, energy (turbine and combustor components), and tooling (conformal-cooled mould inserts). Adoption in automotive series production is growing but still limited by per-part cost above a few hundred units.