EFFICIENT TECHNOLOGY OF SUPERALLOYS EP220 AND EP929 PRODUCTION USING HIGH-TEMPERATURE MELT PREPARING

Based on studies of samples EP220 and EP929 alloys in liquid and solid states the parameters of high temperature melt preparing are defined and justified. Structure of liquid alloys when heated to a certain temperature becomes more equilibrium. During the crystallization process of melt is formed cast metal, characterized by small grain structure, high degree of dispersion of the dendrites, higher density and hardness of the matrix. Implementation of the high temperature melt preparing regimes in industry leads to improve ductility, increase hot strength and quality. Proposed technology does not used all opportunities laid down in the structure of the alloy after high temperature melt preparing. An additional effect can be achieved by increasing the melt holding, optimization of vacuum arc remelting, deformation and heat treatment technology, taking into account the structural changes of the hard metal.

melt, physical properties, structural transformations, high temperature melt preparing, crystallization, cast metal, grain structure, mechanical properties

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