Dec 10 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Introduction
Super alloys or 'high performance' alloys include iron-based, cobalt-based and nickel-based alloys. These alloys contain good oxidation and creep resistance and are available in different shapes.
Super alloys can be strengthened by precipitation hardening, solid-solution hardening and work hardening methods. These alloys can function under high mechanical stress and high temperatures and also in places that require high surface stability.
The following datasheet provides an overview of super alloy 4750™.
Chemical Composition
The chemical composition of super alloy 4750™ is outlined in the following table.
|
Element |
Content (%) |
|
Iron, Fe |
50-52 |
|
Nickel, Ni |
48.25 |
|
Cobalt, Co |
≤ 0.50 |
|
Manganese, Mn |
0.45 |
|
Silicon, Si |
0.30 |
|
Copper, Cu |
≤ 0.30 |
|
Molybdenum, Mo |
≤ 0.30 |
|
Chromium, Cr |
≤ 0.10 |
|
Phosphorous, P |
≤ 0.030 |
|
Carbon, C |
≤ 0.010 |
|
Sulfur, S |
≤ 0.010 |
Physical Properties
The following table shows the physical properties of super alloy 4750™.
|
Properties |
Metric |
Imperial |
|
Density |
8.17 g/cm3 |
0.295 lb/in3 |
Mechanical Properties
The mechanical properties of super alloy 4750™ are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength (typical annealed) |
503 MPa |
73000 psi |
|
Yield strength (typical; annealed, @strain 0.200% ) |
206 MPa |
29900 psi |
|
Elongation at break (typical in 2"; annealed) |
38% |
38% |
|
Hardness, Rockwell B (tempered) |
55 |
55 |
Thermal Properties
The thermal properties of super alloy 4750™ are given in the following table.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@30-350°C/86- 662°F) |
8.50-9.20 µm/m°C |
4.72-5.11 µin/in°F |
Other Designations
Equivalent material to super alloy 4750™ includes MIL I-23011 Class 3.