1. Introduce
– Second generation columnar grain bound alloy
– High temperature strength similar to single crystal (SC) Ni-based alloys
– Designed for advanced military and commercial turbine airfoil applications
– Improved mechanical properties (creep-rupture strength, thermal fatigue and oxidation resistance) compared to earlier columnar grain alloys (PWA 1422)
* PWA Alloy : Mainly applied to airfoil (or airfoil) compressor blades in turbine engine fans
* Single crystal (SC) : A solid in which the entire crystal is regularly oriented along a regular crystal axis
* Columnar grain : The crystals of the nucleus on the wall are elongated at right angles to the wall
2. Property
– High temperature strength, high temperature creep, fatigue strength, oxidation resistance, transverse ductility, excellent castability
| Element | Impact |
|---|---|
| Ni | Provides excellent strength and corrosion resistance |
| Co | Provides strength, creep properties |
| Cr | Provides corrosion resistance, oxidation resistance |
| W | Highly strengthening element, provides high temperature creep properties |
| Ta | Provides strength |
[PWA 1426 Chemical Composition (%)]
| Ni | Cr | C | Al |
|---|---|---|---|
| Min. 60.58 | Max. 6.50 | Max. 0.10 | Max. 6.00 |
| Mo | Co | W | Ta |
|---|---|---|---|
| Max. 1.70 | Max. 10.00 | Max. 6.50 | Max. 4.00 |
| Zr | B | Re | Hf |
|---|---|---|---|
| Max. 0.10 | Max. 0.02 | Max. 3.00 | Max. 1.50 |
3. Available Form
– Sheet, Plate
– Bar, Rod
– Tubing
4. Application & Product
– Aerospace
| Application | Product |
|---|---|
| Aerospace | Turbine Blades, Turbine engine fans, Airfoils |
(1) Turbine Blades / (2) Turbine engine fans
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