Overview
Nimonic 80A is a high-temperature nickel-based alloy known for its excellent high-temperature strength, creep resistance, and oxidation resistance, making it ideal for use in aero engines, gas turbines, nuclear industry, and heat treatment equipment. It is strengthened through solution treatment and age hardening, with aluminum (Al) and titanium (Ti) added to form the γ’ (Ni₃(Al,Ti)) precipitate, significantly improving its creep resistance.
1. Nominal Chemical Composition of Nimonic 80A (%)
Element | Ni (Nickel) | Cr (Chromium) | Co (Cobalt) | Ti (Titanium) | Al (Aluminum) | Fe (Iron) | Mn (Manganese) | Si (Silicon) | Cu (Copper) | C (Carbon) | S (Sulfur) |
---|---|---|---|---|---|---|---|---|---|---|---|
Nominal Value | Balance | 18–21 | ≤2.0 | 1.8–2.7 | 1.0–1.8 | ≤3.0 | ≤1.0 | ≤1.0 | ≤0.2 | 0.06–0.12 | ≤0.015 |
Function of Major Elements:
• Nickel (Ni): Base element providing high-temperature strength and corrosion resistance.
• Chromium (Cr): Enhances oxidation and corrosion resistance.
• Titanium (Ti) + Aluminum (Al): Form γ’ phase to improve high-temperature strength and creep resistance.
• Iron (Fe): Limited to avoid compromising high-temperature strength.
• Cobalt (Co): Improves thermal stability and enhances creep resistance.
• Carbon (C): Increases hardness at high temperatures but excessive content can cause embrittlement.
• Sulfur (S): Restricted to prevent degradation of hot workability.
2. Physical Properties
Property | Value |
---|---|
Density | 8.0 g/cm³ |
Melting Point | 1320–1365°C |
Specific Heat Capacity | 460 J/(kg·K) |
Thermal Conductivity | 11.3 W/(m·K) @ 100°C |
Electrical Resistivity | 1.18 μΩ·m |
Coefficient of Thermal Expansion | 12.8 × 10⁻⁶ /°C (20–1000°C) |
Magnetism | Non-magnetic |
3. Mechanical Properties
(1) At Room Temperature (After Aging Treatment)
Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
---|---|---|---|---|
Typical | 1000 | 600 | 20 | 260–310 |
(2) At Elevated Temperatures
Temperature (°C) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
---|---|---|---|
600 | 780 | 450 | 18 |
800 | 420 | 250 | 22 |
1000 | 120 | 70 | 40 |
(3) Creep Rupture Strength
Temperature (°C) | Stress (MPa) | Time to Rupture (h) |
---|---|---|
650 | 280 | 1000 |
700 | 230 | 1000 |
800 | 110 | 1000 |
4. Heat Treatment Process
Nimonic 80A is primarily strengthened by solution treatment followed by age hardening:
Treatment | Temperature (°C) | Time (h) | Cooling Method |
---|---|---|---|
Solution Treatment | 1080–1120 | 2–4 | Air cooling |
Aging Treatment | 700–750 | 16 | Air cooling |
Purpose:
• Solution Treatment: Improves microstructure uniformity, ductility, and toughness.
• Aging Treatment: Precipitates γ’ strengthening phase, enhancing creep and high-temperature strength.
5. Key Characteristics
✅ Excellent high-temperature strength: Up to 1000 MPa after aging
✅ Superior creep resistance: Suitable for long-term high-temperature loading
✅ Outstanding oxidation resistance: Operable in oxidizing atmospheres from 850 to 1000°C
✅ Good thermal stability: Resists phase transformations at high temperatures
✅ Good weldability: Supports TIG/MIG, resistance welding, electron beam welding
✅ Excellent machinability: Compatible with turning, milling, drilling, and grinding
6. Typical Applications
(1) Aerospace
• Aero engines: turbine blades, combustion chamber parts, exhaust systems
• Turbocharger components: exposed to high temperature and pressure
(2) Power Generation and Nuclear Industry
• Gas turbines: turbine blades, guide vanes
• Nuclear reactors: fuel assemblies and high-temperature structural components
(3) Heat Treatment Industry
• High-temperature furnace linings, heat exchangers, industrial furnace parts
(4) Fasteners and Springs
• High-temperature bolts, washers
• High-temperature springs
(5) Others
• Automotive exhaust systems
• Corrosion-resistant parts in chemical equipment
7. Comparison with Similar Alloys
Alloy | Main Composition | Max Service Temp (°C) | Oxidation Resistance | Creep Strength | Applications |
---|---|---|---|---|---|
Nimonic 80A | Ni-Cr-Ti-Al | 1050 | Excellent | High | Aerospace, gas turbines |
Nimonic 75 | Ni-Cr-Ti | 1000 | Good | Moderate | Industrial furnaces, fasteners |
Inconel 718 | Ni-Cr-Fe-Nb | 1200 | Excellent | Very High | Aerospace, nuclear industry |
Hastelloy X | Ni-Cr-Fe-Mo | 1200 | Excellent | Very High | Aerospace |
8. Available Forms
✅ Rods (Diameter: 5mm–200mm)
✅ Plates (Thickness: 0.5mm–50mm)
✅ Tubes (Outer Diameter: 6mm–100mm)
✅ Wires (Diameter: 0.1mm–10mm)
✅ Custom parts (Machined to drawing)
9. Procurement & Supply
If you require Nimonic 80A or other high-temperature alloys (such as Inconel 718, Hastelloy X), please provide:
• Specification and dimensions (plate, bar, tube, etc.)
• Quantity required
• Application environment (e.g., temperature, corrosive media)