Nimonic 901 (UNS N09901) Properties and Applications
# Nimonic 901 (UNS N09901) Properties and Applications
## Introduction to Nimonic 901
Nimonic 901 is a nickel-based superalloy that belongs to the family of high-performance materials developed for extreme environments. Designated as UNS N09901, this alloy combines excellent mechanical properties with good corrosion resistance, making it suitable for demanding applications in aerospace, power generation, and other high-temperature industries.
## Chemical Composition
The chemical composition of Nimonic 901 plays a crucial role in its performance characteristics:
Nickel (Ni): 40-45%
Chromium (Cr): 11-14%
Iron (Fe): Balance
Titanium (Ti): 2.8-3.1%
Aluminum (Al): 0.9-1.5%
Carbon (C): ≤0.10%
Manganese (Mn): ≤1.0%
Silicon (Si): ≤0.50%
Copper (Cu): ≤0.50%
Keyword: Nimonic 901 UNS N09901
Sulfur (S): ≤0.015%
## Mechanical Properties
Room Temperature Properties
Tensile Strength: 1100-1300 MPa
Yield Strength: 700-900 MPa
Elongation: 15-25%
Elevated Temperature Properties
Retains significant strength up to 650°C (1200°F)
Good creep resistance at high temperatures
Excellent fatigue resistance
## Physical Properties
Density: 8.14 g/cm³
Melting Range: 1315-1390°C (2400-2535°F)
Thermal Conductivity: 11.2 W/m·K at 20°C
Electrical Resistivity: 1.12 μΩ·m at 20°C
Magnetic Permeability: Essentially non-magnetic
## Heat Treatment
Nimonic 901 typically undergoes a solution treatment followed by aging to achieve optimal properties:
Solution Treatment
1095-1120°C (2000-2050°F) for 2-4 hours, followed by rapid cooling
Aging Treatment
775-800°C (1425-1475°F) for 4-8 hours, air cooled
## Corrosion Resistance
Good resistance to oxidation up to 800°C (1470°F)
Moderate resistance to aqueous corrosion
Excellent resistance to stress corrosion cracking
Performs well in mildly reducing and oxidizing environments
## Fabrication and Machining
Forming
Can be hot worked at 1050-1150°C (1920-2100°F)
Cold working possible but requires intermediate annealing
Machining
Requires rigid setups and sharp tools
Slow speeds with heavy feeds recommended
Use of coolant is essential
Welding
Can be welded using TIG and resistance welding methods
Post-weld heat treatment recommended for critical applications
## Applications of Nimonic 901
Aerospace Industry
Gas turbine components
Jet engine parts</p