Jul 30 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Forming
Forging
Welding
Annealing
Cold Working
Hardening
Applications
Introduction
Super alloys are built to function well in high temperature applications. Some of the components that use super alloys include gas turbine engines, rocket motors, nuclear reactors, submarines, and petroleum equipment.
Super alloy Dilaton 42 is an iron-nickel alloy with controlled thermal expansion properties. The following sections will discuss in detail about super alloy Dilaton 42.
Chemical Composition
The chemical composition of Dilaton 42 is outlined in the following table.
|
Element |
Content (%) |
|
Nickel, Ni |
42.3 |
|
Manganese, Mn |
0.95 |
|
Silicon, Si |
0.14 |
|
Carbon, C |
0.03 |
|
Cobalt, Co |
0.03 |
|
Chromium, Cr |
0.02 |
|
Copper, Cu |
0.02 |
|
Aluminum, Al |
0.01 |
|
Iron, Fe |
Remainder |
Physical Properties
The physical properties of Dilaton 42 are tabulated below.
|
Properties |
Metric |
Imperial |
|
Density |
8.11 g/cm3 |
0.293 lb/in3 |
|
Melting point |
1440°C |
2624°F |
Mechanical Properties
The following table shows mechanical properties of Dilaton 42.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
500 MPa |
72 ksi |
|
Yield strength |
270 MPA |
39 ksi |
|
Elongation |
35% |
35% |
|
Hardness, (HB) |
130 |
130 |
Other Designations
Equivalent materials to Dilaton 42 are ASTM B388 and ASTM F30.
Fabrication and Heat Treatment
Machinability
Dilaton 42 can be machined easily using the conventional methods.
Forming
Good ductility makes Dilaton 42 readily formable.
Forging
Forging can be done at 1204°C (2200°F). Sulfur contamination due to long soaking time in a furnace atmosphere should be avoided.
Welding
Welding of Dilaton 42 can be performed using all the traditional welding methods.
Annealing
Annealing can be performed at 788°C (1450°F) followed by air cooling.
Cold Working
Dilaton 42 can be easily cold worked as the alloy is ductile.
Hardening
Dilaton 42 can be hardened only by cold working.
Applications
Dilaton 42 is chiefly used in glass-to-metal sealing of components that are enclosed in a glass envelope, such as electron tubes and lamps.