Inconel 783 Rod: Advanced Low-Expansion Alloy for High-Temperature Applications
Inconel 783 rods are engineered for high-performance applications requiring a combination of low thermal expansion, superior oxidation resistance, and high strength. This nickel-cobalt-iron alloy, enhanced with aluminum, chromium, and niobium, is particularly suited for components in gas turbines and steam turbines, where maintaining precise tolerances and resisting thermal degradation are critical.
Chemical Composition
The chemical composition of Inconel 783 ensures its exceptional properties:
| Element |
Composition (%) |
| Nickel (Ni) |
26.0–30.0 |
| Cobalt (Co) |
Balance |
| Iron (Fe) |
24.0–27.0 |
| Aluminum (Al) |
5.0–6.0 |
| Chromium (Cr) |
2.5–3.5 |
| Niobium (Nb) |
2.5–3.5 |
| Titanium (Ti) |
0.10–0.40 |
| Boron (B) |
0.003–0.012 |
| Carbon (C) |
≤0.03 |
| Manganese (Mn) |
≤0.50 |
| Silicon (Si) |
≤0.50 |
| Phosphorus (P) |
≤0.015 |
| Sulfur (S) |
≤0.005 |
| Copper (Cu) |
≤0.50 |
Mechanical Properties
In the standard heat-treated condition, Inconel 783 rods exhibit the following mechanical properties:
| Property |
Value |
| Tensile Strength |
1130 MPa |
| Yield Strength (0.2% Offset) |
779 MPa |
| Elongation |
24% |
| Reduction of Area |
44% |
| Hardness |
Rockwell C 27 |
Physical Properties
Inconel 783 rods possess the following physical characteristics:
| Property |
Value |
| Density |
7.81 g/cm³ |
| Melting Range |
1336–1407°C |
| Specific Heat |
455 J/kg·°C |
| Thermal Conductivity |
10.1 W/m·°C at 21°C |
| Coefficient of Thermal Expansion |
10.08 µm/m·°C at 93°C |
Applications
Due to its unique combination of properties, Inconel 783 rods are ideal for:
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Gas Turbine Components: Utilized in rings, casings, shrouds, and seals where low thermal expansion and high strength are essential.
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Steam Turbine Parts: Employed in components requiring oxidation resistance and dimensional stability under high temperatures.
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Aerospace Engineering: Applied in structural parts that demand a balance of lightweight, strength, and thermal stability.
Frequently Asked Questions (FAQ)
Q: What distinguishes Inconel 783 rods from other superalloys?
A: Inconel 783 rods offer a unique blend of low thermal expansion, high strength, and excellent oxidation resistance, making them particularly suitable for precision high-temperature applications.
Q: Can Inconel 783 rods be machined and welded?
A: Yes, Inconel 783 rods can be machined and welded using conventional techniques suitable for high-strength nickel alloys. It's recommended to perform rough machining in the annealed condition for optimal results.
Q: What heat treatment is applied to Inconel 783 rods?
A: The standard heat treatment involves solution annealing at 1121°C for 1 hour followed by air cooling, beta aging at 845°C for 4 hours with air cooling, and a two-step age hardening process at 718°C and 621°C.
Q: Are there specific standards governing Inconel 783 rods?
A: Yes, Inconel 783 rods conform to standards such as SAE AMS 5940, ensuring consistent quality and performance.
Inconel 783 rods represent a significant advancement in materials engineering, providing solutions for industries that demand reliability and performance in extreme environments.
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