Inconel 718 Investment Casting: Properties, Specs & Uses
Inconel 718 investment casting is the preferred route for high-strength, heat-resistant nickel superalloy parts used in jet engines, gas turbines, and rocket motors. At Uni Tritech, India’s NADCAP-certified aerospace foundry, we cast Inconel 718 to net shape with full metallurgical traceability.
This guide explains Inconel 718 investment casting properties, the heat treatment it needs, and how it compares with IN625. For background, see our investment casting process overview and the Inconel reference on nickel superalloys.
What Is Inconel 718 Investment Casting?
Inconel 718 investment casting uses the lost-wax process to form complex, near-net-shape parts from a precipitation-hardenable nickel-chromium superalloy. The alloy holds its strength to about 700°C, so Inconel 718 investment casting suits hot-section aerospace and energy components.
This guide explains Inconel 718 investment casting: the materials, process, tolerances and quality controls that matter. Uni Tritech is India's Airbus-approved, NADCAP-certified foundry serving aerospace, defence and medical OEMs globally.
Nickel Superalloy Casting Properties of Inconel 718
The nickel superalloy casting properties of Inconel 718 come from gamma double-prime strengthening. Cast Inconel 718 delivers high tensile strength, excellent fatigue life, and strong oxidation resistance. These nickel superalloy casting properties make it a workhorse for discs, casings, and brackets.
Key Inconel 718 casting properties:
- Tensile strength up to 1,240 MPa after full heat treatment.
- Service temperature near 700°C with strong creep resistance.
- Excellent resistance to oxidation, pitting, and crevice corrosion.
- Good weldability with low strain-age cracking risk.
- Near-net-shape casting cuts machining of this hard alloy.
Inconel 718 Heat Treatment Casting
Inconel 718 heat treatment casting is essential to develop full mechanical properties. The standard route is solution annealing followed by a double-aging cycle. Without correct Inconel 718 heat treatment casting, parts never reach their specified strength.
Standard heat treatment cycle:
- Solution anneal near 980°C, then rapid cool to fix the matrix.
- First age at 720°C for 8 hours to precipitate gamma double-prime.
- Furnace cool to 620°C for the second aging stage.
- Second age at 620°C for 8 hours, then air cool.
- Add HIP before aging when maximum fatigue life is required.
Inconel 718 vs IN625 Casting: Which Alloy Wins?
In an Inconel 718 vs IN625 casting comparison, 718 is age-hardenable and far stronger, while IN625 is solid-solution strengthened with superior corrosion resistance. Choose Inconel 718 vs IN625 casting based on whether strength or corrosion drives your design.
- Pick Inconel 718 for high-strength, fatigue-critical turbine parts.
- Pick IN625 for marine, chemical, and high-corrosion service.
- 718 is heat-treatable; IN625 relies on solid-solution strengthening.
- Both cast well to net shape using investment casting.
Why Choose Uni Tritech for Inconel 718 Investment Casting
Uni Tritech is a NADCAP-certified, AS9100D foundry approved by Airbus and Collins Aerospace. We deliver Inconel 718 investment casting with vacuum induction melting, in-house CNC machining, and full non-destructive testing for safety-critical parts.
- Vacuum induction melting for clean, low-inclusion nickel superalloy.
- NADCAP-accredited NDT: radiography, FPI, and ultrasonic testing.
- AS9102 first-article inspection with full CMM dimensional reports.
- One-stop casting, machining, and finishing under one roof.
Frequently Asked Questions
Inconel 718 is the most widely used nickel superalloy for jet engine castings because it combines high strength, fatigue resistance, and weldability up to about 700°C. For hotter sections, IN939 or MarM247 are specified.
For load-bearing turbine components needing high strength and fatigue life, Inconel 718 is better because it is age-hardenable. IN625 is chosen where corrosion resistance matters more than raw strength.
Inconel 718 investment casting is used for turbine discs, casings, brackets, seals, and structural hot-section parts in jet engines, rockets, and industrial gas turbines.
Yes. Inconel 718 heat treatment casting, a solution anneal plus double aging, is required to reach full strength. HIP is added when maximum fatigue life is needed.
Yes. Uni Tritech exports NADCAP-certified Inconel 718 investment casting to aerospace and energy OEMs worldwide, with full traceability and AS9102 documentation.
Need Inconel 718 investment casting for your aerospace or energy programme? Uni Tritech delivers NADCAP-certified, AS9100D nickel superalloy castings with full traceability. Contact our team today.
Looking for a trusted Inconel 718 investment casting manufacturer in India?
Uni Tritech casts high-performance nickel superalloy components for aerospace, defence, space, and energy. Talk to us about your Inconel 718 castings today.
