Nov 15 2012
Super alloys or high performance alloys are of three types that include iron-based, cobalt-based and nickel-based alloys. These alloys can be strengthened by precipitation hardening, solid-solution hardening and work hardening methods.
Super alloys contain good oxidation and creep resistance and are available in varied shapes. These alloys can function under high mechanical stress and high temperatures and also in places that require high surface stability.
Super alloy A-286 is an iron-based high temperature and high strength alloy. The following datasheet provides an overview of super alloy A-286.
Chemical Composition
The chemical composition of super alloy A-286 is outlined in the following table.
| Element |
Content (%) |
| Iron, Fe |
54 |
| Nickel, Ni |
25.5 |
| Chromium, Cr |
14.8 |
| Titanium, Ti |
2.13 |
| Molybdenum, Mo |
1.30 |
| Manganese, Mn |
1.0 |
| Silicon, Si |
0.50 |
| Vanadium, V |
0.30 |
| Aluminum, Al |
0.18 |
| Carbon, C |
0.040 |
| Phosphorous, P |
0.020 |
| Sulfur, S |
0.015 |
| Boron, B |
0.0060 |
Physical Properties
The following table shows the physical properties of super alloy A-286.
| Properties |
Metric |
Imperial |
| Density |
7.92 g/cm3 |
0.286 lb/in3 |
| Melting point |
1399°C |
2550°F |
Mechanical Properties
The mechanical properties of super alloy A-286 are displayed in the following table.
| Properties |
Metric |
Imperial |
| Tensile strength |
1035 MPa |
150100 psi |
| Yield strength (@strain 0.200%) |
759 MPa |
110000 psi |
| Elongation at break |
25% |
25% |
| Reduction of area |
40% |
40% |
| Hardness, Brinell (estimated from Rockwell C value for Brinell test with 3000 kg load/10 mm diameter ball) |
304 |
304 |
| Hardness, Knoop (estimated from Rockwell C value) |
330 |
330 |
| Hardness, Rockwell C |
32 |
32 |
| Hardness, Vickers (estimated from Rockwell C value) |
318 |
318 |
Other Designations
Equivalent materials to super alloy A-286 are given in the table below.
| AISI 660 |
AMS 5525 |
AMS 5726 |
AMS 5732 |
AMS 5734 |
| AMS 5731 |
AISI 662 |
AMS 5737 |
AMS 5804 |
AMS 5895 |
| AMS 5853 |
AMS 5805 |
AMS 5858 |
DIN 1.4943 |
SPS M250 |
| DIN 1.4944 |
GE B50T81 |
GE B50T12 |
GE B50T1181 |
ASTM A453 Grade 660 |
| ASTM A638 Grade 660 |
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Fabrication and Heat Treatment
Cold Working
Super alloy A-286 is capable of being readily cold worked and a solution anneal heat treatment is recommended when this alloy is work hardened due to severe cold forming. This solution anneal heat treatment will thus enable softening of super alloy A-286.
Welding
Welding methods used for stainless steels are also recommended for super alloy A-286. The area to be welded should be clean. Post welding heat treatment or preheating is not recommended for this alloy. Better welding results can be obtained when this alloy is solution annealed.
Forging
Heavy forging and light forging are suitable for super alloy A-286. Heavy forging is carried out between 1010-1204°C (1850-2200°F) and light forging between 871-1010°C (1600-1850°F).
Forming
Conventional forming methods are used to readily hot or cold form super alloy A-286.
Machinability
Conventional machining techniques are used to readily machine super alloy A-286. This machining process involves turning, drilling and milling. In the turning operations, the usage of cemented carbide tools is recommended for high cutting rates.
Aging
Super alloy A-286 is first solution heat treated at 982°C (1800°F) before the aging process. Aging takes place for 16 h at 718°C (1325°F) after which this alloy is cooled in air.
Hardening
Super alloy A-286 is hardened by the cold working process and is also capable of being age hardened due to the presence of titanium in this alloy.
Heat Treatment
Super alloy A-286 is solution annealed at 982°C (1800°F), oil quenched, held for 16 h at 718°C (1325°F) and finally cooled in air. This heat treatment improves the strength of super alloy A-286.
Applications
Super alloy A-286 is used in gas turbine forgings, fasteners, superchargers, cryogenic equipment, missile components, corrosive deep well hardware and jet engines.