Waspaloy Alloy Bar
Waspaloy alloy bar is a nickel-base alloy with excellent high-temperature strength and good resistance to oxidation at temperatures up to 1600 °F. Has higher stability and strength ranges than those available for alloy 718. Can be heat treated in three-steps: solution treatment, stabilisation, and age-hardening.
AMS 5708 (Type 2 is capable of AMS 5709) - Waspaloy alloy bar containing chromium and cobalt, typically used in aircraft fasteners where high strength up to 1500°F and oxidation resistance up to 1750°F is required.
Waspaloy alloy bar is multiple-melted, usually with either a vacuum induction melt (VIM) followed by a vacuum arc remelt (VAR), or a vacuum induction melt (VIM) followed by an electroslag remelt (ESR).
Chemical Composition
|
Element |
Content (%) |
|
Nickel, Ni |
56 |
|
Chromium, Cr |
19 |
|
Cobalt, Co |
13.5 |
|
Molybdenum, Mo |
4.30 |
|
Titanium, Ti |
3 |
|
Iron, Fe |
≤ 2 |
|
Aluminum, Al |
1.50 |
|
Silicon, Si |
≤ 0.15 |
|
Manganese, Mn |
≤ 0.10 |
|
Carbon, C |
0.080 |
|
Zirconium, Zr |
0.050 |
|
Boron, B |
0.0060 |
Physical Properties
|
Properties |
Metric |
Imperial |
|
Density |
8.20 g/cm3 |
0.296 lb/in3 |
|
Melting point |
1358°C |
2475°F |
Mechanical Properties
|
Properties |
Metric |
Imperial |
|
Tensile strength |
1335 MPa |
193600 psi |
|
Yield strength (@ strain 0.200%) |
910 MPa |
132000 psi |
|
Modulus of elasticity (@20°C) |
213 GPa |
30900 ksi |
|
Elongation at break (in 51 mm) |
26.6% |
26.6% |
Significant advantages
Excellent high-temperature creep strength
Its creep life can exceed 100 hours under stress of 310 MPa at 815°C. This means it can operate for extended periods under high temperature and pressure without fracture. Waspaloy's strength performance is generally superior to that of another common high-temperature alloy, Inconel 718.
Oxidation resistance
In gas environments, it resists oxidation and corrosion by forming a dense Cr₂O₃ oxide film on the surface, extending component life.
Good strength-toughness balance
It maintains sufficient toughness and ductility while ensuring high strength. It is less prone to brittle fracture under high stress, making it safer and more reliable.
Excellent thermal fatigue resistance
Good thermal stability and a low coefficient of thermal expansion allow it to withstand drastic temperature cycling well, reducing the likelihood of cracking.
Application
- Aerospace fasteners
- Jet engine components
- Missile components
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