The Guide to 3D Printing with Inconel (LPBF)

What Is Inconel, and Why Does It Matter for Additive Manufacturing?

Inconel is a family of nickel-chromium superalloys engineered to retain mechanical properties at temperatures and in chemical environments that degrade aluminum, stainless steel, and most titanium alloys. Conventional machining of Inconel is slow and costly: the material work-hardens rapidly, tool wear is severe, and buy-to-fly ratios on complex components can run extremely high, driving raw material cost far beyond what the finished part requires. 3D printing with Inconel via LPBF changes that equation by building near-net-shape parts directly from Inconel powder, enabling internal geometries without subtractive cost penalties and reducing raw material consumption to what the part actually requires. MakerVerse offers LPBF in both Inconel 625 and Inconel 718.

Inconel 625 vs. Inconel 718 — Which Alloy Is Right for Your Application?

The two alloys are not interchangeable. The choice comes down to one axis: does your application demand maximum corrosion resistance, or maximum mechanical strength at operating temperature? 

Inconel 625 — When Corrosion Is the Primary Threat

IN625’s higher chromium and molybdenum content produces superior resistance to seawater, chloride-induced pitting, and acids. It strengthens via solid-solution hardening, requiring no aging heat treatment, which simplifies post-processing and produces more predictable dimensional stability. It also has a wider LPBF processing window than IN718, making it less prone to hot cracking. MakerVerse data sheets (v1.0.8) confirm relative density above 99.5%.

Typical applications: subsea components, offshore oil and gas hardware, marine fittings, chemical processing reactors and piping.

Values shown are reference values per data sheet v1.0.8; binding values on request.

Inconel 718 — When Mechanical Strength at Temperature Dominates

IN718 achieves its strength through precipitation hardening (gamma-prime and gamma-double-prime phases activated by heat treatment), producing stable mechanical properties up to 700°C and a hardness of 47 HRc. The tradeoff is a narrower LPBF processing window and a mandatory multi-step post-processing sequence. As-built IN718 without aging does not meet specification. Data values below apply to fully heat-treated material per MakerVerse data sheets (v1.0.8).

Typical applications: aerospace turbine blades, combustion chambers, fuel nozzles, downhole tools, rocket engine components.

Values shown are reference values per data sheet v1.0.8; binding values on request.

Side-by-Side Decision Table

Decision rule: if corrosion or chemical exposure dominates, specify IN625. If mechanical strength at elevated temperature is the primary constraint, specify IN718. For further guidance on selecting the right metal powder, see MakerVerse’s LPBF material selection guide.

Advantages of LPBF for Inconel Parts

The case for 3D printing with Inconel via LPBF is strongest when geometry is complex and the raw material is expensive — which describes most Inconel applications. LPBF produces conformal cooling channels, internal lattice structures, and undercuts that no cutting tool can reach, all without the subtractive cost penalty. It also eliminates casting tooling lead times: instead of months for pattern tooling and foundry scheduling, MakerVerse returns a binding delivery date alongside the instant quote. On the technical side, build volumes reach 500×500×500 mm, standard tolerance is ±0.3 mm up to 100 mm, and relative density above 99.5% is achievable for IN625.

Design for Manufacturing (DFM) — LPBF Rules for Inconel

Most DFM errors in 3D printing with Inconel come from applying stainless steel LPBF rules or CNC assumptions to a nickel superalloy. Inconel’s residual stress behavior and powder characteristics require a different approach. The rules below reflect general industry practice for nickel-superalloy LPBF rather than a published MakerVerse specification; confirm limits for a specific geometry via the Technology and Material Advisor or a manual engineering review.

Five DFM Rules for Inconel LPBF

1. Wall thickness: minimum 1.0 mm; structural walls at 2.0 mm or above. Below 1.0 mm, thermal stress during the build risks distortion or failure on support removal.

2. Overhangs: features angled below 45° from the build plate require support. In Inconel, support removal is significantly harder than in aluminum or stainless steel — minimize support volume on functional surfaces.

3. Internal channels: minimum opening 3 mm for powder removal; complex cavities require 7 mm. Trapped Inconel powder cannot be removed after sintering.

4. Corners and edges: fillet all internal edges with a minimum radius of 3 mm. Sharp corners concentrate thermal stress and become crack initiation sites in nickel superalloys.

5. Detail size: minimum feature size 0.5 mm. Smaller features lose definition due to Inconel powder particle size. Use CNC finishing for precision below 0.5 mm.

Post-Processing Inconel LPBF Parts

Post-processing is part of the material specification for any 3D-printed Inconel part, not an optional step. The two alloys follow meaningfully different paths.

IN625: stress relief is recommended but less critical than for IN718. Surface finishing options include polishing, tumbling, painting, and CNC machining of functional surfaces. HIP is only necessary for fatigue-critical or safety-critical applications.

IN718 (mandatory for structural parts): the industry-standard sequence per ASTM F3055-14a and AMS 2774:

1. Stress relief: 1065°C / 1.5 h

2. HIP (strongly recommended for fatigue-critical parts): 1120–1185°C / 4 h / ≥100 MPa — dissolves Laves phase, closes micro-voids

3. Solution anneal: 980°C / 1 h, air cool

4. Double aging: 718°C / 8 h + 621°C / 10 h — activates precipitation hardening

Industry Applications — Who Uses Inconel LPBF and Why

Aerospace is the largest IN718 consumer: turbine blades, combustion chambers, and fuel nozzles all require stable mechanical properties up to 700°C, and 3D printing with Inconel via LPBF enables the internal cooling geometries that casting cannot match economically.

Energy and oil and gas split by failure mode. Load-bearing turbomachinery and downhole tools use IN718. Components exposed to hot exhaust, seawater, or aggressive chemistry use IN625 — including gas-turbine emissions probes produced via MakerVerse LPBF. See the full customer stories for more examples.

Chemical processing: reactor internals and heat exchangers in acid or chloride media are IN625 applications, where corrosion resistance is the design priority.

3D Printing with Inconel: Ordering via MakerVerse

MakerVerse offers LPBF in Inconel 625 and 718 with tolerances of ±0.3 mm, build volumes up to 500×500×500 mm, and delivery from 6 working days. Upload your CAD file and technical drawing to receive a binding instant quote with a fixed delivery date. Every order goes through twofold quality control, and the consistency guarantee ensures reorders match the first build. For alloy selection support, the Technology and Material Advisor is available on the platform. Choosing between IN625 and IN718 starts with the operating environment. LPBF makes both alloys accessible for geometries that conventional machining cannot produce economically.