Incoloy 907
Details
Lork Group high-quality Incoloy 907 (UNS N19907) is a nickel-iron-cobalt alloy with additions of niobium and titanium for precipitation hardening. Alloy 907 is used for gas turbine components (seals, shafts, casings, and other structural parts).
Products Description
Lork Group high-quality Incoloy 907 (UNS N19907) is a nickel-iron-cobalt alloy with additions of niobium and titanium for precipitation hardening. It has a low coefficient of expansion and high strength of alloy 903, but alloy 907 has improved notch-rupture properties at elevated temperatures. Alloy 907 is used for gas turbine components (seals, shafts, casings, and other structural parts).
Incoloy 907 normally receives one of two heat treatments, depending on whether the strength requirements of the application are tensile limited or rupture limited. For tensile-limited applications, the age-hardening treatment is: 1325°F (720°C)/8 h, furnace cool at 100°F (55°C)/h to 1150°F (620°C)/8 h, air cool.
For rupture-limited applications, the treatment is: 1425°F (775°C)/12 h, furnace cool at 100°F (55°C)/h to 1150°F (620°C)/8 h, air cool.
Before either age-hardening treatment, the alloy is given a solution anneal of 1800°F (980°C)/1 h, air cool.
Chemical Composition
|
Elements |
Content (%) |
|
Iron, Fe |
42 |
|
Nickel, Ni |
38 |
|
Cobalt, Co |
13 |
|
Niobium, Nb |
4.7 |
|
Titanium, Ti |
1.5 |
|
Silicon, Si |
0.15 |
|
Aluminum, Al |
0.03 |
Physical Properties
|
Properties |
Metric |
Imperial |
|
Density |
8.33 g/cm³ |
0.301 lb/in³ |
|
Melting point |
1385°C |
2525°F |
Mechanical Properties
|
Properties |
Metric |
Imperial |
|
Tensile strength (precipitation hardened, value at room temperature) |
1350 MPa |
196000 psi |
|
Yield strength (@ strain 0.200%, precipitation hardened, value at room temperature) |
1100 MPa |
160000 psi |
|
Poisson's ratio |
0.36 |
0.36 |
|
Elongation at break (precipitation hardened) |
10% |
10% |
|
Reduction of area |
36 |
36 |
Applications
- Gas turbine seals
- Casings
- Glass-to-metal sealing