Abstract
The present work is devoted to the effect of modification of high-temperature alloys ZhS6U-VI and ZhS3DK-VI with hafnium on their properties and structure. Alloys ZhS6U-VI and ZhS3DK-VI were molten in a vacuum induction furnace and modified with hafnium in an amount of 0–1.5% (as calculated) using a nickel-hafnium alloying composition. It is shown that hafnium alloying diminishes the sizes and amount of the brittle component in a fracture and the distance between the second-order dendrite axes and changes the morphology of the carbides. With growth of the hafnium content the mechanical properties of both alloys and the high-temperature strength of alloy ZhS3DK-VI at room temperature increase.
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