Jan 2 2013
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsFabrication and Heat Treatment Machinability Forming Heat Treatment Cold Working AnnealingApplications
Introduction
Super alloy or high performance alloys have good creep and oxidation resistance, and are available in different forms. Cobalt-based, nickel-based, and iron-based alloys are three groups of super alloys. They can function under high temperatures and mechanical stress. They are also utilized where high surface stability is required. They were primarily developed for jet engines as they require very high operating temperatures.
Hiperco alloy 50™ is a soft magnetic alloy. It can be easily cracked while forging. The following datasheet gives an overview of Hiperco alloy 50™.
Chemical Composition
The chemical composition of Hiperco alloy 50™ is given in the following table.
| Elements |
Content (%) |
| Iron, Fe |
49 |
| Cobalt, Co |
48.75 |
| Vanadium, V |
1.9 |
| Manganese, Mn |
0.05 |
| Niobium, Nb |
0.05 |
| Silicon, Si |
0.05 |
| Carbon, C |
0.01 |
Physical Properties
The following table shows the physical properties of Hiperco alloy 50™.
| Properties |
Metric |
Imperial |
| Density |
8.12 g/cm³ |
0.293 lb/in³ |
Mechanical Properties
The mechanical properties of cold rolled Hiperco alloy 50™ are outlined in the following table.
| Properties |
Metric |
Imperial |
| Tensile strength |
1345 MPa |
195100 psi |
| Yield strength (@ strain 0.200%) |
1275 MPa |
184900 psi |
| Elongation at break (in 50 mm) |
1% |
1% |
| Hardness, Brinell (estimated from Rockwell C for 3000 kg load, 10 mm ball Brinell measurement) |
334 |
334 |
| Hardness, Knoop (converted from Rockwell C ) |
363 |
363 |
| Hardness, Rockwell C |
36 |
36 |
| Hardness, Vickers (estimated from Rockwell C) |
349 |
349 |
Thermal Properties
The thermal properties of Hiperco alloy 50™ are displayed in the following table.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@ 25-200°C/77-392°F) |
9.50 µm/m°C |
5.28 µin/in°F |
| Thermal conductivity |
29.8 W/mK |
207 BTU in/hr.ft².°F |
Other Designations
Other designation equivalent to Hiperco alloy 50™ is ASTM A801 alloy type 1.
Fabrication and Heat Treatment
Machinability
Hiperco alloy 50™ is not produced in machinable forms.
Forming
Hiperco alloy 50™ is very difficult to form due to the presence of high cobalt content.
Heat Treatment
Hiperco alloy 50™ is heat treated at 838°C (1540°F) for 2 h in pure hydrogen followed by slowly cooling at 83 to 94°C (180 to 200°F)/ h.
Cold Working
Hiperco alloy 50™ has high work hardening rate
Annealing
Hiperco alloy 50™ has good magnetic and physical properties such as high permeability, low DC coercive force, and high saturation flux density at high inductions.
Applications
Hiperco alloy 50™ is used in the following applications:
- Transducers
- Motor laminations
- Transformer
- Poles and cores
- Head laminations