Scientific journal
Scientific Review. Technical science
ISSN 2500-0799
ПИ №ФС77-57440

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EFFECT OF PREPARATION MODE LIQUID ALLOYS EK77 BEFORE CRYSTALLIZATION ON THE CHARACTERISTICS OF CAST, HOMOGENIZED AND AGED STRUCTURE IN THE SOLID STATE

Zhilyakov A.Y. 1 Popov A.A. 1 Belikov S.V. 1 Burmasov S.P. 1 Gudov A.G. 1
1 Ural Federal University named after First President of Russia B.N. Yeltsin
Research of influence of melt processing on the homogenization and aging of the EK77 alloy was carried out. Liquidus and solidus temperatures were determined for alloy EK77. It is shown that the thermo-time processing of the melt affects the type of ingot crystallization. By scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction phase analysis, it was determined that during the crystallization of the alloy austenite and σ-phase are formed. It is found that the homogenization mode of the ingot depends on the thermo-time processing of the melt. It was established that a high melt superheat above the liquidus temperature prevents the formation of topologically close packed σ-phase during the initial stages of aging. Thermo-time processing of the melt has no significant effect on the phase composition of the alloy at long-term aging, but contributes polygonization austenite.