Abstract
The effect of high-temperature melt treatment (HTMT), regimes of crystallization, and heat treatment on the structure and properties of castings from high-temperature nickel alloys ZhS3DK-VI, ZhS26-VI, and ZhS32-VI is investigated. It is shown that an optimum HTMT process noticeably decreases the nitrogen content in alloy ZhS3DK-VI and improves its structure and properties. Directed crystallization of alloys ZhS26-VI and ZhS32-VI is more effective than volume crystallization for diminution of the structural components, reduction of dendritic segregation, and elevation of the crack resistance of the metal. Heat treatment of alloy ZhS32-VI at 1270°C instead of 1210°C provides a favorable microstructure and a higher strength level in the material.
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