Nov 15 2012
Topics Covered
Introduction
Physical Properties
Mechanical Properties
Fabrication and Heat Treatment
Machinability
Forming
Welding
Forging
Annealing
Hardening
Applications
Introduction
Super alloys are metallic alloys that function at high temperature environment where high surface stability and deformation resistance are mainly required. Three major classification of super alloys include iron-base, nickel-base and cobalt-base alloys. Based on its application and composition, nickel-base and cobalt-base super alloys may be cast or wrought. The iron-base super alloys are generally wrought alloys featuring stainless steel technology. Super alloys are commonly forged, rolled to sheet or produced in various shapes. However, highly alloyed compositions are produced as castings. These alloys contain different elements in various combinations in order to achieve the desired result.
The following datasheet explains in detail about super alloy AM 40.
Physical Properties
The physical properties of super alloy AM 40 are given in the following table.
|
Properties |
Metric |
Imperial |
|
Density |
7.7 g/cm³ |
0.28 lb/in³ |
Mechanical Properties
The mechanical properties of super alloy AM 40 are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Poisson’s ratio |
0.298 |
0.298 |
Fabrication and Heat Treatment
Machinability
Machining of super alloy AM 40 can be performed through resulfurized lubricant, positive feeds and slow speeds. This alloy employs all kinds of machining practices. However, the usage of breakers or curlers is preferred to avoid tough and stringy chips.
Forming
Super alloy AM 40 can be formed using any common forming method. However, springback must be taken into consideration before selecting the appropriate forming method.
Welding
Welding methods such as submerged arc welding, gas metal arc welding and gas tungsten arc welding can be used to weld super alloy AM 40.
Forging
Super alloy AM 40 should be heated to 1093ºC (2000ºF), soaked to equalize and then heated to 1176ºC (2150ºF) before forging.
Annealing
Super alloy AM 40 is annealed at 1038 to 1121ºC (1900 to 2050ºF) followed by quenching in water or air.
Hardening
Super alloy AM 40 can be hardened using cold working method.
Applications
The following are some of the major applications of super alloy AM 40:
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Fasteners
-
Pipe components
-
Ducting equipment
-
Bellows