Jul 4 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
Machinability
Welding
Hot Working
Cold Working
Applications
Introduction
INCONEL MA754 is an oxide dispersion strengthened, nickel-chromium super alloy. It is produced by mechanical alloying. Mechanical alloying involves high-energy milling of metal powders to produce a uniformly distributed, fine dispersoid of yttrium oxide in the alloy.
The following section explains in detail about super alloy INCONEL MA754.
Chemical Composition
The chemical composition of INCONEL MA754 is outlined in the following table.
|
Element |
Content (%) |
|
Nickel. Ni |
78 |
|
Chromium, Cr |
20 |
|
Iron, Fe |
1 |
|
Aluminum, Al |
0.3 |
|
Titanium, Ti |
0.5 |
|
Yttrium oxide, Y2O3 |
0.6 |
|
Carbon, C |
0.05 |
Physical Properties
The physical properties of INCONEL MA754 are tabulated below.
|
Properties |
Metric |
Imperial |
|
Density |
8.30 g/cm3 |
0.300 lb/in3 |
|
Melting point |
1400°C |
2550°F |
Mechanical Properties
The following table shows mechanical properties of INCONEL MA754.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
950 MPa |
138000 psi |
|
Yield strength |
570 MPa |
82700 psi |
|
Elastic modulus |
203 GPa |
29.4 ksi |
|
Elongation at break |
20% |
20% |
Thermal Properties
The thermal properties of INCONEL MA754 are tabulated below.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@0.000-100°C/32-212°F) |
12.2 µm/m°C |
6.78 µin/in°F |
|
Thermal conductivity |
14.3 W/m°C |
99.14 BTU in/hr.ft².°F |
Fabrication and Heat Treatment
Machinability
INCONEL MA754 is readily machined using all the conventional processes.
Welding
Brazing is commonly used to weld this alloy. Laser and electron beam welding is also used. Using the conventional TIG welding can lead to reduced high temperature stress rupture strength at the joint.
Hot Working
INCONEL MA754 can be hot worked into any desired shape; however this can be done before grain coarsening final annealing.
Cold Working
INCONEL MA754 can be easily cold worked.
Applications
INCONEL MA754 is chiefly used in applications where high temperature creep resistance and corrosion resistance are required.
INCONEL MA754 is also used in the following:
-
Gas turbine engine components
-
Furnace fixtures
-
Skid rails
-
Fasteners