Nimonic Alloy 80A
| Chemical Analysis | |
|---|---|
| C | Carbon 0.10 max |
| Mn | Manganese 1.00 max |
| Si | Silicon 1.00 max |
| Fe | Iron 3.00 max |
| Cr | Chromium 18.00 – 21.00 |
| Co | Cobalt 2.0 max |
| Al | Aluminium 1.0 – 1.8 |
| Ti | Titanium 1.8 – 2.7 |
| S | Sulfur 0.015 max |
| Ni | Nickel Balance |
General characteristics of
This is a wrought, age-hardenable alloy that owes its strength to additions of titanium, aluminum and carbon. The alloy was developed for service up to 1500ºF (815ºC). High-frequency melting and casting is used for forms to be extruded and electroslag remelting where material is to be forged.
Applications
Nimonic 80A alloy is currently used for gas-turbine components such as blades, rings and discs; for bolts, nuclear boiler tube supports, die-casting inserts and cores, and for automobile exhaust valves.
Forging
The alloy should be forged between 2190 and 1920ºF (1200 and 1050ºC) after which process it may be air cooled or water quenched, depending upon the size and intricacy of the forged part.
Heat treatment
For hot-worked material the following heat treatment is recommended :
8 hours at 1975ºF (1080ºC) air cool, plus 16h at 1290ºF (700ºC) and air cool.
Machinability
The alloy should be in the fully heat-treated condition prior to machining operations. Machining should be carried out under strict conditions as specified by Special Metals Corporation, who should be consulted regarding detailed procedures.
Weldability
Nimonic 80A alloy sheet may be welded by any resistance process. For material up to 5mm (0.2in.) thick, TIG or MIG processes are satisfactory. Above this thickness micro-cracking may occur in the weld and the heat-affected zone. Electron beam, friction, inertia and flash-butt welding are all satisfactory for material over 5 mm thick.
Welding should be done on solution-treated material and post-weld heat treatment is necessary to achieve optimum properties.
Again, further advice is available from Special Metals Corporation.
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