Nov 19 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesFabrication and Heat Treatment Machinability Forming Heat Treatment Cold Working Annealing HardeningApplications
Introduction
Super alloys or high performance alloys have good creep and oxidation resistance. They are used in environments with very high temperatures and mechanical stress, and also where high surface stability is required. Work hardening, precipitation hardening, and solid-solution hardening are performed for increasing strength of the super alloys.
Super alloys were primarily developed for jet engines as they require very high operating temperatures. They are classified into three groups, namely cobalt-based, nickel-based, and iron-based alloys.
The following datasheet gives an overview of super alloy IN-597™.
Chemical Composition
The following table shows the chemical composition of super alloy IN-597™.
| Element |
Content (%) |
| Nickel, Ni |
48.4 |
| Chromium, Cr |
24.5 |
| Cobalt, Co |
20 |
| Titanium, Ti |
3 |
| Aluminum, Al |
1.5 |
| Molybdenum, Mo |
1.5 |
| Niobium, Nb |
1 |
| Carbon, C |
0.05 |
| Zirconium, Zr |
0.05 |
| Magnesium, Mg |
0.02 |
Physical Properties
The physical properties of super alloy IN-597™ are given in the following table.
| Properties |
Metric |
Imperial |
| Density |
7.7-8.03 g/cm³ |
0.278-0.290lb/in³ |
| Melting point |
1372°C |
2500°F |
Mechanical Properties
The mechanical properties of super alloy IN-597™ are outlined in the following table.
| Properties |
Metric |
Imperial |
| Tensile strength |
1158 MPa |
167954 psi |
| Yield strength |
1034 MPa |
149969 psi |
| Elastic modulus |
190-210 GPa |
27557-30458 ksi |
| Poisson's ratio |
0.27-0.30 |
0.27-0.30 |
| Elongation |
15% |
15% |
| Reduction of area |
53% |
53% |
| Hardness |
335 |
335 |
Thermal Properties
The thermal properties of super alloy IN-597™ are given in the following table.
| Properties |
Conditions |
| T (ºC) |
Treatment |
| Thermal conductivity |
42.7 W/mK |
100 |
- |
Fabrication and Heat Treatment
Machinability
Super alloy IN-597™ can be machined using conventional techniques.
Forming
Super alloy IN-597™ can be formed using conventional techniques.
Heat Treatment
Super alloy IN-597™ is heat treated at 1149°C (2100°F) for 4 h followed by cooling in air.
Cold Working
Super alloy IN-597™ has good cold working capacity.
Annealing
Super alloy IN-597™ is annealed at 1149°C (2100°F) for 4 h followed by cooling in air.
Hardening
Super alloy IN-597™ can be hardened by cold working and heat treatment.
Applications
Super alloy IN-597™ is mainly used in high temperature and strength applications such as gas turbine hot section components.