Open Access
Review
Table 1
Role of alloying elements in Ni-based superalloy [11,12].
| Element | Effects |
|---|---|
| Nickel (Ni) | Formation of γ′ (Ni3(Al, Ti)) phase, stabilization of face-centered cube (FCC) matrix, hinders the formation of deleterious phases |
| Cobalt (Co) | Increases the solvus temperature of γ′ and reduces the stacking fault energy |
| Chromium (Cr) | Solid solution strengthening, sulphidation and oxidation resistance, formation of grain boundary carbide |
| Iron (Fe) | Solid solution strengthening |
| Titanium (Ti) | Forms γ′ (Ni3(Al, Ti)) and carbides (MC type) (where M= denotes a metal, M = Cr, Fe, W, Mo) |
| Aluminum (Al) | Forms γ′ (Ni3(Al, Ti)) and enhances oxidation resistance |
| Carbon (C) | Carbide formation (Viz., MC, M23C6) |
| Boron (B), Zirconium (Zr) | Stress rupture property improvement imparts strength to grain boundaries. |
| Molybdenum (Mo), Tantalum (Ta), and Tungsten (W) | Strengthening of solid solution and carbide formation (MC type) |
| Lanthanum (La) and Yttrium (Y) | Improvement in oxidation resistance |
| Niobium (Nb) | Forms γ′′ (Ni3Nb) and carbide formation (MC type) |
| Vanadium (V) | Forms γ′′ |
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