Dec 3 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Annealing
Cold Working
Welding
Forming
Machinability
Heat Treatment
Applications
Introduction
Super alloys or high performance alloys are available in a variety of shapes and contain elements in different combinations to obtain a specific result. These alloys are of three types that include iron-based, cobalt-based and nickel-based alloys. The nickel-based and cobalt-based super alloys are available as cast or wrought based alloys based on composition and application.
Super alloys have good oxidation and creep resistance and can be strengthened by precipitation hardening, solid-solution hardening and work hardening methods. They can also function under high mechanical stress and high temperatures and also in places that require high surface stability
Super alloy nNimonic 105™ is a nickel-cobalt-chromium alloy. The following datasheet provides an overview of Nimonic 105™.
Chemical Composition
The chemical composition of Nimonic 105™ is outlined in the following table.
|
Element |
Content (%) |
|
Nickel, Ni |
51 |
|
Cobalt, Co |
18-22 |
|
Chromium, Cr |
14-15.7 |
|
Molybdenum, Mo |
4.50-5.50 |
|
Aluminum, Al |
4.50-4.90 |
|
Iron, Fe |
1 |
|
Manganese, Mn |
1 |
|
Silicon, Si |
1 |
|
Titanium, Ti |
0.90-1.50 |
|
Copper, Cu |
0.20 |
|
Zirconium, Zr |
0.15 |
|
Carbon, C |
0.12 |
|
Sulfur, S |
0.010 |
|
Boron, B |
0.0030-0.010 |
Physical Properties
The following table shows the physical properties of Nimonic 105™.
|
Properties |
Metric |
Imperial |
|
Density |
8.01 g/cm³ |
0.289 lb/in³ |
|
Melting point |
1327°C |
2420°F |
Mechanical Properties
The mechanical properties of Nimonic 105™ are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength (precipitation hardened, value at room temperature) |
1150 MPa |
167000 psi |
|
Yield strength (precipitation hardened, value at room temperature, @strain 0.200%) |
770 MPa |
112000 psi |
|
Elongation at break (precipitation hardened) |
25% |
25% |
Thermal Properties
The thermal properties of Nimonic 105™ are given in the following table.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@20-100°C/68-212°F) |
12.2 µm/m°C |
6.78 µin/in°F |
|
Thermal conductivity |
10.89 W/mK |
75.58 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to Nimonic 105™ includes DIN 2.4634.
Fabrication and Heat Treatment
Annealing
Nimonic 105™ can be solution heat treated at 1149°C (2100°F) and then cooled in air.
Cold Working
Standard tooling methods are used for cold working Nimonic 105™. Usage of plain carbon steels is not recommended as they may produce galling. Galling can be reduced by the usage of soft die materials and heavy duty lubricants.
Welding
Welding techniques recommended for Nimonic 105™ include gas-tungsten arc welding, gas metal-arc welding, submerged-arc welding and shielded metal-arc welding. Usage of a matching alloy filler metal is recommended for the welding process and if a matching filler is absent, an alloy rich in Ni, Co, Cr, Mo is can be used. during the absence of a matching filler metal.
Forming
Conventional methods and heavy-duty lubricants are used for the forming process of Nimonic 105™ that as it has good ductility. A pPowerful equipment is recommended for this alloy as it is stronger than the commonly available steels.
Machinability
Nimonic 105™ is can be machined by conventional machining methods. This alloy has higher levels of gumminess and strength, and is work-hardened during the machining process. Tooling and usage of a heavy duty machining equipment during the machining process enables minimizing work-hardening or chatter of this alloy before the cutting process. Heavy lubricants are suitable for boring, tapping, drilling or broaching operations, and coolants that are water-based are recommended for high speed operations like milling, grinding or turning.
Heat Treatment
Nimonic 105™ can be heat treated in 4 four steps. The steps are as follows:
-
Solution annealing for 4 h at 1149°C (2100°F) followed by air cooling.
-
Heating for 16 h at 1056°C (1925°F) followed by air cooling.
-
Heating for 16 h at 849°C (1560°F).
-
Air cooling to reach precipitation-hardening.
Applications
Nimonic 105™ is used for high temperature gas turbine components.