Nov 16 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Cold Working
Annealing
Aging
Applications
Introduction
Super alloys contain many elements in a variety of combinations to obtain desired results. These alloys are good for use at high temperatures and severe mechanical stress, and also in cases where high surface stability is needed. Super alloys provide good creep and oxidation resistance.
Strengthening of super alloys is performed by work hardening, solid-solution hardening, and precipitation hardening methods. MP 159™ is a multiphase cobalt-nickel-chromium alloy with ductility, corrosion resistance, and ultra-high strength.
The following datasheet will provide more details about super alloy MP 159™.
Chemical Composition
The following table shows the chemical composition of MP 159™.
|
Element |
Content (%) |
|
Cobalt, Co |
35.7 |
|
Nickel, Ni |
25.5 |
|
Chromium, Cr |
19 |
|
Iron, Fe |
9 |
|
Molybdenum, Mo |
7 |
|
Titanium, Ti |
3 |
|
Niobium, Nb |
0.6 |
|
Aluminum, Al |
0.2 |
Physical Properties
The physical properties of MP 159™ are outlined in the following table.
|
Properties |
Metric |
Imperial |
|
Density |
8.33 g/cm³ |
0.301 lb/in³ |
|
Melting point |
1427°C |
2600°F |
Mechanical Properties
The mechanical properties of MP 159™ are provided below.
|
Properties |
Metric |
Imperial |
|
Tensile strength (annealed 1052°C) |
848 MPa |
123000 psi |
|
Yield strength (at strain 0.200%, annealed 1052°C) |
400 MPa |
58000 psi |
|
Elastic modulus (at 232°C/450°F,annealed) |
208 GPa |
30200 ksi |
|
Shear modulus (at 232°C/450°F,annealed) |
75.8 GPa |
11000 ksi |
|
Elongation at break (cold worked 48%) |
12% |
12% |
|
Reduction of area |
46% |
46% |
Thermal Properties
The thermal properties of MP 159™ are given below.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (at 25-100°C/77-212°F) |
14.3 µm/m°C |
7.94 µin/in°F |
Other Designations
Equivalent materials to MP 159™ are:
-
AMS 5841
-
AMS 5842
-
AMS 5843
Fabrication and Heat Treatment
Cold Working
MP 159™ is ductile in nature and capable of being cold worked using conventional methods.
Annealing
MP 159™ can be annealed at 1177°C (2150°F) and then rapidly air cooled.
Aging
The optimum hot tensile strength of the MP 159™ is enhanced by cold working (45-50% reduction of area) and aging at 663°C (1225°F) for 4 hours, which is then followed by air cooling.
Applications
MP 159™ is mainly used in gas turbine hot section components that are operated in high temperature environment of up to 649°C (1200°F).