Aug 7 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication
Machinability
Welding
Cold working
Applications
Introduction
NILO alloys are composed of nickel and iron as the main components. In addition to nickel and iron other materials are added for enhancing the strength of the alloy.
NILO alloys are known as controlled expansion alloys, meaning these alloys exhibit a low expansion co-efficient under low and high temperatures. Controlled expansion alloys also exhibit good mechanical strength, ductility and hardness.
The naming of various NILO alloys is done based on the nickel content, NILO 42, NILO 36, NILO 52, NILO K alloy and NILO 365 are the names of the NILO alloys. The NILO 365 alloy was specifically fabricated to suit the requirements of the aerospace industry.
The nickel content of this alloy is 43% and titanium and niobium are added for improving the strength. Some of the characteristics of this alloy are durability, high creep strength, tolerance to tooling and age hardenability. It is the first alloy of nickel that exhibits high-strength and low-expansion.
This datasheet will look into the chemical composition, properties and applications of NILO 365 alloy.
Chemical Composition
The chemical composition of NILO 365 alloy is given in the following table.
|
Element |
Content (%) |
|
Iron, Fe |
51.78 |
|
Nickel, Ni |
43.5 |
|
Niobium, Nb |
3.3 |
|
Titanium, Ti |
1.4 |
|
Carbon, C |
0.02 |
Physical Properties
The following table discusses the physical properties of NILO 365 alloy.
|
Properties |
Metric |
Imperial |
|
Density |
8.11 gm/cm3 |
0.293 lb/in3 |
Mechanical Properties
The mechanical properties of NILO 365 alloy after annealing are tabulated below.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
717 MPa |
104 ksi |
|
Yield strength |
407 MPa |
59 ksi |
|
Elongation at break( 50 mm annealed and age hardened) |
16% |
16% |
Other Designations
Some of the other designations that are used to denote NILO 365 alloy are as below:
Fabrication
A prerequisite for heat treatment and fabrication of NILO 365 alloy is that it must be annealed.
Machinability
NILO 365 alloy is machinable after it is annealed. After machining it must be age hardened.
Welding
Welding can be carried out on the NILO 365 alloy after annealing.
Cold working
The NILO 365 alloy can be readily cold worked after annealing.
Applications
The NILO 365 alloy is used in the following applications:
-
Manufacture of tooling composites
-
Aerospace components for Boeing aircraft control parts
-
RTM technology.