Rene N6(Ni-Co-Cr-Ta-W)

1. Introduce

– Third-generation single crystal superalloy with about 6% Re added

– Improved temperature acceptance over 1st and 2nd generation single crystal superalloys

* Single crystal superalloys

1. Superalloy developed to increase creep resistance and temperature acceptance by minimizing grain boundaries
2. Grain boundary formation is suppressed by suppressing the addition of elements such as C, B, Zr, and Hf, which are grain boundary strengthening elements, and heat treatment at higher temperatures is possible to increase the fraction of γ′ phase and improve microstructure uniformity
3. Large amounts of refractory alloying elements such as W, Ta, and Mo are added to optimize the mechanical properties of single crystal alloys
4. Representative first-generation single crystal superalloys : Rene N4, CMSX-2, CMSX-3, CMSX-6, PWA1480, etc.
5. Representative second generation single crystal superalloys : Rene N5, PWA 1484, CMSX-4, etc.
6. Representative 3rd generation single crystal superalloys : Rene N6, CMSX-10, etc.

* Re

1. The most important added element in the development of single crystal alloys
2. Role in improving the temperature acceptance of alloys
3. When added in large amounts, it forms a secondary reaction zone with the TCP phase, resulting in microstructural instability of the alloy and deterioration of alloy properties at high temperature
4. Freckle defects are more likely to form when added in large quantities, but can be suppressed by increasing the content of Ta

* TCP phase (Topologicalloy Closed Packed Phase)

1. TCP phases such as σ, μ, P phase tend to form when exposed to high temperature for a long time
2. Brittle organization, mechanical properties such as creep life, ductility, impact strength, etc. decrease as the content in the base increases
3. The tendency of precipitation of TCP phase increases slightly when the content of refractory elements such as Re, Mo, and W is high

2. Property

– Excellent creep properties, thermal fatigue properties, and oxidation resistance

[Rene N6 Chemical Composition (%)]

3. Available Form

– Bar, Rod

– Sheet, Plate

– Wire, Coil

4. Application & Product

– Aerospace

(1) Gas turbine blades / (2) Airfoils