Abstract
Niobium based alloys are most promising materials for high temperature aerospace and defence applications at temperature above the use of nickel base superalloys (1100 °C). Cb-752 (Nb-10W-2.5Zr) alloy pancakes were prepared by non-consumable arc melting process under argon atmosphere using thoriated tungsten electrode. In view of the very high melting point of tungsten as compared to niobium, it was found necessary to melt the pancake multiple times to ensure complete dissolution of tungsten in the alloy. The temperature of hot forging as well as method for oxidation protection during hot forging was optimised. It was observed that the alloy could be hot forged at 1300 °C. It was further found that the silicide and aluminide coatings, and evacuated stainless steel jacket protected the alloy from oxidation during hot forging. The forged pancakes were cold rolled to 1.5 mm thick sheets. The room temperature mechanical properties of Cb-752 alloy sheet produced from the pancakes were comparable to the data reported in literature.
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