Abstract
The addition of Re to Ni-based cast superalloys significantly changes the solidification behaviour and thereby improves the creep strength and resistance to high temperature corrosion and oxidation in both columnar grained and single crystal blades. This is because the partitioning behaviour of Re is different from that of other alloying additions in nickel based superalloys. Re containing alloys in the present study solidifies as dendrites of γ-phase together with inter dendritic eutectic of γ–γ′. It has been observed that the growth rate, apart from affecting the solidification structure influences the solid-state transformation of γ–γ′ and thus changes the γ–γ′ distribution and morphology.
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