Nimonic PE11 Alloy Sheet
Nimonic PE11 is a nickel-based superalloy renowned for exceptional high-temperature performance. Developed for applications requiring strength and corrosion resistance under thermal stress, it's widely used in aerospace and power generation.
Nimonic PE11 Alloy Sheet (UNS N09901) main elements are nickel, iron, and chromium, but the additions of Aluminium, Titanium, and Molybdenum make the PE11 both precipitation-hardened and solid-solution strengthened. Alloy PE11 is commonly used in gas turbines because of its high tensile strength and ductility, and because it was developed for use at 550°C (1020°F).
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Heat Treatment
Nimonic PE11 has to be solution annealed at 1021°C (1870°F) for 2 h, and then air cooled. This process is repeated twice at 799°C (1470°F) for 2 h and air-cooled, and at 699°C (1290°F) for 16 h and air-cooled.
Chemical Composition
|
Element |
Content (%) |
|
Nickel, Ni |
37-41 |
|
Iron, Fe |
32 |
|
Chromium, Cr |
17-19 |
|
Molybdenum, Mo |
4.75-5.75 |
|
Titanium, Ti |
2.20-2.50 |
|
Cobalt, Co |
1 |
|
Aluminum, Al |
0.70-1.0 |
|
Silicon, Si |
0.50 |
|
Copper, Cu |
0.50 |
|
Manganese, Mn |
0.20 |
|
Carbon, C |
0.030-0.080 |
|
Zirconium, Zr |
0.020-0.050 |
|
Sulfur, S |
0.015 |
|
Boron, B |
0.0010 |
Physical Properties
|
Properties |
Metric |
Imperial |
|
Density |
8.02 g/cm³ |
0.290 lb/in³ |
|
Melting point |
1280-1350°C |
2340-2460°F |
Mechanical Properties
|
Properties |
Metric |
Imperial |
|
Tensile strength (precipitation hardened, value at room temperature) |
1060 MPa |
154000 psi |
|
Yield strength (@strain 0.200%, precipitation hardened, value at room temperature) |
700 MPa |
102000 psi |
|
Elongation at break (precipitation hardened) |
20% |
20% |
Thermal Properties
|
Properties |
Metric |
Imperial |
|
Thermal expansion coefficient (@20-100°C/68-212°F) |
12.0 µm/m°C |
6.67 µin/in°F |
|
Thermal conductivity |
10.6 W/mK |
73.6 BTU in/hr.ft².°F |
-
Key Properties
High-Temperature Strength: Retains tensile/creep strength up to ~750°C, ideal for turbine components.
Oxidation Resistance: Chromium content protects against oxidative environments.
Fatigue Resistance: Suitable for cyclic thermal loading (e.g., jet engine parts).
-
Applications
Aerospace: Combustion chambers, turbine blades, and exhaust systems.
Power Generation: Gas turbine components, nuclear reactors.
Industrial: High-temperature fasteners, heat exchangers.
-
Fabrication & Processing
Forming: Requires hot working (e.g., rolling at elevated temperatures) due to high strength at room temperature.
Welding: Challenging; techniques like TIG or electron beam welding may be used, often requiring post-weld heat treatment.
Machining: Difficult; carbide tools and slow speeds recommended.
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