Nov 29 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 include iron-based, cobalt-based and nickel-based alloys. These alloys contain 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.
Nimonic 115™ is a nickel-chromium-cobalt-molybdenum alloy that can be precipitation-hardened. It has and suitable for oxidation resistance and high temperature strength.
The following datasheet provides an overview of Nimonic 115™.
Chemical Composition
The chemical composition of Nimonic 115™ is outlined in the following table.
|
Element |
Content (%) |
|
Nickel, Ni |
54 |
|
Chromium, Cr |
14.0-16.0 |
|
Cobalt, Co |
13.0-15.5 |
|
Aluminum, Al |
4.50-5.50 |
|
Molybdenum, Mo |
3.0-5.0 |
|
Titanium, Ti |
3.50-4.50 |
|
Iron, Fe |
1.0 |
|
Manganese, Mn |
1.0 |
|
Silicon, Si |
1.0 |
|
Copper, Cu |
0.20 |
|
Zirconium, Zr |
0.15 |
|
Carbon, C |
0.12-0.20 |
|
Sulfur, S |
0.015 |
|
Boron, B |
0.010-0.025 |
Physical Properties
The following table shows the physical properties of Nimonic 115™.
|
Properties |
Metric |
Imperial |
|
Density |
7.85 g/cm³ |
0.284 lb/in³ |
|
Melting point |
1304°C |
2380°F |
Mechanical Properties
The mechanical properties of Nimonic 115™ are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength (precipitation hardened, value at room temperature) |
1300 MPa |
189000 psi |
|
Yield strength (precipitation hardened, value at room temperature, @strain 0.200%) |
850 MPa |
123000 psi |
|
Elongation at break (precipitation hardened) |
25.00% |
25.00% |
Thermal Properties
The thermal properties of Nimonic 115™ are given in the following table.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@20-100°C/68-212°F) |
12.0 µm/m°C |
6.67 µin/in°F |
|
Thermal conductivity |
10.6 W/mK |
73.6 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to Nimonic 115™ are:
Fabrication and Heat Treatment
Annealing
Nimonic 115™ is solution annealed at 1190°C (2175°F) followed by cooling in a rapid manner.
Cold Working
Standard tooling methods are used for cold working Nimonic 115™. 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 115™ 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 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 115™ that as it has good ductility. A poPowerful equipment is recommended for this alloy as it is stronger than the commonly available steels. After the forming process all traces of lubricant should be cleaned to prevent embrittlement of the alloy.
Machinability
Nimonic 115™ is 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. and Water-based coolants that are water-based are recommended for high- speed operations like such as milling, grinding or turning.
Heat Treatment
Nimonic 115™ is solution annealed for 1 ½ 1/2 hours at 1190°C (2175°F), air cooled to 1099°C (2010°F), held for 6 hours at 1099°C (2010°F) and again cooled in air.
Applications
Nimonic 115™ is suitable for use in high temperature components in gas turbine applications.