Dec 12 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesFabrication and Heat Treatment Cold Working Welding Forming Machinability Aging Heat TreatmentApplications
Introduction
Super alloys or high performance alloys include iron-based, cobalt-based and nickel-based alloys. These alloys have good oxidation and creep resistance and are available in different shapes.
Super alloys can be strengthened by precipitation hardening, solid-solution hardening and work hardening methods. These alloys can function under high mechanical stress and high temperatures and also in places that require high surface stability.
Rene 95™ is a high strength and nickel-based high temperature alloy and is considered as one of the strongest alloys among other super alloys.
The following datasheet provides an overview of Rene 95™.
Chemical Composition
The chemical composition of Rene 95™ is outlined in the following table.
| Element |
Content (%) |
| Nickel, Ni |
59.32-65.42 |
| Chromium, Cr |
12-14 |
| Cobalt, Co |
7-9 |
| Aluminum, Al |
3.30-3.70 |
| Molybdenum, Mo |
3.30-3.70 |
| Niobium, Nb (Columbium, Cb) |
3.30-3.70 |
| Tungsten, W |
3.30-3.70 |
| Titanium, Ti |
2.30-2.70 |
| Carbon, C |
0.040-0.090 |
| Zirconium, Zr |
0.030-0.070 |
| Boron, B |
0.0060-0.015 |
Physical Properties
The following table shows the physical properties of Rene 95™.
| Properties |
Metric |
Imperial |
| Density |
8.22 g/cm³ |
0.297 lb/in³ |
| Melting point |
1343ºC |
2450ºF |
Mechanical Properties
The mechanical properties of Rene 95™ are displayed in the following table.
| Properties |
Metric |
Imperial |
| Tensile strength (at room temperature) |
240 MPa |
34800 psi |
| Yield strength (at room temperature) |
180 MPa |
26100 psi |
| Elongation at break (at room temperature) |
14% |
14% |
| Reduction of area (at room temperature) |
17% |
17% |
Fabrication and Heat Treatment
Cold Working
Standard tooling methods are used for Rene 95™. Soft die materials and heavy duty lubricants are recommended during the cold working process for this alloy in order to minimize galling and obtain good results.
Welding
Rene 95™ can be welded by the commonly used welding techniques, and an equally corresponding alloy filler metal should be used during the welding process. The welding methods recommended for this alloy include submerged-arc welding, gas-tungsten arc welding, gas metal-arc welding and shielded metal-arc welding.
Forming
Rene 95™ can be formed by the standard forming techniques. This alloy has good ductility but requires a powerful equipment during the forming process because of its higher strength levels in comparison to regular steel.
Machinability
Rene 95™ can be machined by conventional machining methods. This alloy possesses higher strength, gumminess and work-hardening qualities while being machined. Usage of water-based coolants is preferred for milling, turning or grinding. Usage of heavy lubricants is preferred for boring, drilling, broaching or tapping operations. Work-hardening of the alloy before the cutting process and chatter can be minimized by using tooling and a heavy duty machining equipment.
Aging
Rene 95™ is age-hardenable.
Heat Treatment
Rene 95™ reacts to aging heat treatment.
Applications
Rene 95™ is used in gas turbine hot section components.