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Aseries of experiments is carriedout with six nickel based single crystal superalloys for use in industrial gas turbines. Each alloy contains lZmass%Cr, but no Re. The alloy compositions are chosen with the aid of the d-electrons concept, so that any undesirable phases do not appear in the alloy. The creep rupture life is measured at a stress of 196MPa and a temperature of 1193K which is close to the service temperature, 115OK of industrial gas turbines in power plants. The measured life of two alloys in this condition is found to be comparable to that of the 2nd generation nickel based single crystal superalloy containing 3%Re alloy. Also, it is shown that the amount of lZmass%Cr is not necessary to get good hot-corrosion resistance, as long as both the compositional ratios of ‘H/Al andTa/(W+Mo) are high in the alloy. In addition, a dense ‘liOz-rich layer is found on the surface of the alloy with good hot-corrosion resistance. In contrast to the hot-corrosion resistance, the oxidation resistance is lowered if the Tl/Al compositional ratio is high in the alloy. The possible mechanisms for hot corrosion and oxidation are discussed in this study.

Alloying Effects on Surface Stability and Creep Strength of Nickel Based Single Crystal Superalloys Containing 12 Mass% Cr