Inconel 718 CNC Turned Parts for Jet Engine Combustion Chambers

In the demanding aerospace sector, Inconel 718 (UNS N07718) stands as a premier nickel-chromium-based superalloy for CNC-turned components in jet engine combustion chambers. This age-hardenable alloy maintains exceptional mechanical properties and oxidation resistance at temperatures up to 700°C, making it ideal for the most thermally challenging sections of turbine engines.

Material Composition and Properties
The sophisticated composition of Inconel 718 includes 52-55% nickel and 19-21% chromium, with significant additions of niobium (4.75-5.25%) and molybdenum (2.8-3.3%). This elemental combination creates superior high-temperature strength through gamma prime and gamma double prime precipitation strengthening phases. The material demonstrates remarkable yield strength of 1035 MPa at room temperature, maintaining 690 MPa at 650°C. Its thermal stability allows continuous operation in combustion environments while resisting oxidation and carburization up to 980°C.

Advanced Manufacturing Process
Producing precision Inconel 718 turned parts requires specialized CNC machining approaches. The process begins with certified stock material undergoing rigorous ultrasonic testing. CNC turning centers equipped with PCBN (Polycrystalline Cubic Boron Nitride) inserts and high-pressure coolant systems (minimum 80 bar) handle the alloy's work-hardening tendency. Strategic process planning includes:

• Speed-controlled roughing at 25-35 m/min surface speed

• Precision finishing operations maintaining ±0.005mm tolerances

• Interrupted cut management for complex geometries
  Post-machining heat treatment follows AMS 5662 specifications, with solution treatment at 955-1010°C and age hardening at 720°C for 8 hours, followed by furnace cooling at 55°C/hour to 620°C with 8-hour stabilization.

Quality Assurance and Applications
Each component undergoes comprehensive verification including:

• Fluorescent penetrant inspection for surface defect detection

• Three-coordinate measurement for dimensional verification

• Microstructure examination ensuring proper grain size (ASTM 5-8)
  These precision parts serve critical functions in combustion chambers, compressor sections, and turbine assemblies across commercial and military aircraft platforms.

Technical Advantages
Inconel 718 turned components offer unmatched reliability in extreme environments, providing excellent creep rupture strength up to 650°C and superior fatigue resistance under thermal cycling conditions. The combination of advanced CNC turning technologies and specialized heat treatments creates components that withstand the most demanding aerospace applications while maintaining dimensional stability throughout their service life.