Electrometallurgy Today, 2022, №03



2022 №03 (05)

DOI of Article 10.37434/sem2022.03.06

2022 №03 (07)

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Electrometallurgy Today (Sovremennaya Elektrometallurgiya), 2022, #3, 38-43 pages

Composition of zirconium alloy ingots of Zr–Nb–Ti system melted by integrated vacuum-arc technology

O.Ye. Kapustian, T.О. Akrytova

National University «Zaporizhzhsіa Polytekhnika». 64 Zhukovskyi Str., 69063, Zaporizhzhіa, Ukraine. E-mail: aek@zntu.edu.ua

Abstract
The chemical composition of zirconium alloy ingots of the Zr–Nb–Ti system was studied. The ingot of the experimental zirconium alloy was smelted by the method of complex melting. Ingots with a diameter of 120 mm were obtained by a single vacuum-arc remelting in a copper crystallizer of consumable electrodes with a diameter of 50 mm, previously obtained by vacuum-arc remelting with a non-consumable electrode in a vacuum arc furnace. This method allows obtaining chemically homogeneous ingots. The content of the main alloying elements was assessed using a scanning microscope, and of oxygen — using a gas analyzer. The transition coefficients of the charge elements at vacuum-arc remelting with a consumable electrode are determined. It is established that the content of the main alloying elements in the ingots of vacuum-arc remelting corresponds to their estimated composition. The chemical composition of Zr–Nb– Ti alloy ingots was studied, and it was shown that the material is characterized by a fairly high homogeneity throughout the ingot structure without signs of zonal segregation. The results of the microanalysis established the absence of heterogeneity in the study area. Examination of the ingot metal by ultrasonic flaw detection of the alloy showed the absence of internal structural defects. Thus, a complex technology that includes vacuum-arc remelting with a non-consumable electrode in a vacuum arc sealing furnace and vacuum-arc remelting in a crystallizer with a consumable copper electrode is an effective way to obtain zirconium alloy ingots of the Zr–Nb–Ti system. This technology eliminates the shortcomings of other existing technologies and provides high-quality ingots of zirconium alloy. Ref. 16, Tabl. 1, Fig. 4.
Keywords: vacuum-arc remelting; zirconium alloy; ingot; chemical composition; conversion factor; quality; technology

Received 26.05.2022

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