FGH96
Material Introduction
FGH96 is a high-performance nickel-based powder metallurgy (P/M) superalloy specifically engineered for advanced powder metallurgy turbine disc applications. Designed for long-term operation under extreme temperatures, stress, and centrifugal loading, FGH96 provides excellent creep resistance, fatigue strength, and microstructural stability at service temperatures ranging from 650 to 750°C. Produced through hot isostatic pressing (HIP), isothermal forging, and controlled heat treatment, the alloy forms a uniform γ/γ′ microstructure with fine, stable precipitates that enhance high-temperature strength. With precise alloying additions—such as chromium, cobalt, molybdenum, tungsten, titanium, and aluminum—FGH96 achieves performance comparable to world-class turbine disc materials used in aerospace engines. Under Neway AeroTech’s rigorous material processing and precision manufacturing environment, FGH96 turbine discs demonstrate exceptional reliability, dimensional accuracy, and long service life in both civilian and military aviation power systems.
Alternative Material Options
Depending on temperature, load, and engine stage, several alternatives may be considered. For ultra-high-temperature turbine blades or directional components, single-crystal alloys available under single crystal casting offer superior creep strength. For corrosive or chemically aggressive combustion environments, Hastelloy alloys provide enhanced resistance. When wear and hot galling dominate design requirements, Stellite cobalt alloys may be the preferred choice. For lower-temperature rotating components requiring high toughness but not extreme thermal resistance, casting steels can be a cost-effective option. When titanium’s high strength-to-weight ratio is advantageous, TA15 and other titanium alloys can be suitable for cooler stages of the turbine.
International Equivalent / Comparable Grade
Country/Region | Equivalent / Comparable Grade | Specific Commercial Brands | Notes |
USA | ME3 / René 95 / René 88DT | GE René 95, GE René 88DT, ATI ME3 | Comparable P/M turbine disc alloys with similar γ′ strengthening. |
Europe (EN) | P/M Ni superalloys | P/M disc alloys for EU aeroengines | Used in high-duty compressor/turbine discs. |
China (GB/YB) | FGH96 (national standard designation) | FGH series P/M alloys | China’s primary P/M turbine disc material. |
ISO | P/M Ni-based superalloys | ISO aerospace-grade P/M alloys | Defines material characteristics & testing. |
Neway AeroTech | FGH96 P/M superalloy | Optimized for high-integrity turbine discs. |
Design Purpose
FGH96 was developed to serve as a high-strength, high-temperature turbine disc material capable of operating at elevated stresses and rotational speeds in the hot section of aero-engines. Its core design goal is to maintain stable mechanical properties—especially creep, fatigue, and tensile strength—under hundreds of thousands of flight cycles. Alloying elements such as Al and Ti promote the formation of γ′ strengthening phases, while Mo, Co, and W enhance high-temperature strength and solid-solution hardening. The powder metallurgy route enables the production of fine, uniform microstructures without casting segregation, ensuring predictable behavior during forging and subsequent heat treatment. The alloy is intended for turbine discs, compressor discs, and structural rotors that require long-term stability, excellent damage tolerance, and strict dimensional integrity in severe thermal and mechanical environments.
Chemical Composition
Element | Ni | Co | Cr | Mo | W | Al | Ti | Others |
Typical (%) | Balance | 8–15 | 12–16 | 2–4 | 3–6 | 2–3 | 3–4 | B, C, Zr, Hf (trace) |
Physical Properties
Property | Value |
Density | ~8.1–8.3 g/cm³ |
Melting Range | ~1300–1350°C |
Thermal Conductivity | ~8–12 W/m·K |
Electrical Conductivity | ~2–4% IACS |
Thermal Expansion | ~13–15 µm/m·°C (20–800°C) |
Mechanical Properties
Tensile Strength (RT) | ~1100–1400 MPa |
Yield Strength (RT) | ~900–1200 MPa |
Elongation | ~10–18% |
High-Temperature Strength | Excellent up to 750°C |
Fatigue Resistance | Very high; optimized via P/M & HIP |
Creep Resistance | Superior long-term behavior at 650–700°C |
Key Material Characteristics
Extremely high strength at both room and elevated temperatures due to γ′ strengthening.
Fine, uniform microstructure achieved via P/M eliminates segregation found in cast superalloys.
Excellent creep resistance critical for continuous turbine disc loading up to ~700°C.
Superior fatigue life, especially under high-cycle and low-cycle fatigue regimes found in aero-engine rotors.
Outstanding damage tolerance and crack-growth resistance.
High microstructural stability under thermal cycling, reducing long-term deformation.
Compatible with advanced HIP densification for premium part integrity.
Retains strong oxidation and corrosion resistance due to Cr and Al oxide layers.
Optimized for precision powder metallurgy turbine disc manufacturing.
Proven performance in military and commercial aviation turbine engines.
Manufacturability And Post Process
Powder metallurgy processing: Enables homogeneous alloy distribution and fine microstructure.
Hot Isostatic Pressing (HIP) ensures full densification and elimination of porosity.
Isothermal forging shapes turbine discs with optimized grain flow for fatigue resistance.
Heat treatment: Aging & solution cycles enhance γ′ precipitation and mechanical properties.
Superalloy CNC machining delivers tight tolerances for firtrees, bores, and attachment features.
EDM: Essential for intricate geometries and heat-affected features.
Deep hole drilling: Creates cooling holes or internal channels where required.
Material testing and analysis: Metallography, creep test, fatigue test ensure aerospace-grade quality.
Surface finishing such as shot peening improves fatigue life and crack initiation resistance.
NDT methods (UT, X-ray, CT) verify structural integrity for flight-critical parts.
Suitable Surface Treatment
Shot peening for improved fatigue performance and residual compressive stress.
Diffusion coatings for oxidation protection in high-temperature zones.
TBC coatings to extend life in extreme turbine environments.
Precision grinding and polishing for rotor interfaces and high-stress joints.
Stress-relief heat treatment after forging or machining.
Microstructure verification via metallographic analysis.
Common Industries and Applications
Aerospace and aviation: High-pressure and intermediate-pressure turbine discs.
Power generation: Turbine rotors for aero-derivative gas turbines.
Military aviation: High-strength discs for afterburning engines.
Advanced energy systems: Rotating high-temperature components.
High-performance industrial turbines requiring extreme fatigue and creep stability.
When to Choose This Material
High-temperature turbine discs: Ideal for continuous operation at temperatures of 650–750 °C.
High-speed rotating components: Excellent for parts requiring extreme fatigue strength.
Long-term creep resistance: Suitable for components under sustained thermal & mechanical stress.
Powder metallurgy precision: Perfect when segregation-free microstructure is essential.
High integrity requirements: Required for aerospace-class reliability and quality.
Weight optimization: Provides high strength without significant density penalty.
Critical flight hardware: Reliable for mission-critical turbine discs and rotors.
Demanding lifecycle conditions: Works well in cyclic, thermal, and high-load environments.
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