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2021 №03 (04) DOI of Article
10.37434/sem2021.03.05
2021 №03 (06)

Electrometallurgy Today 2021 #03
SEM, 2021, #3, 28-34 pages

Manufacturing deformed semi-finished zirconium alloy products from ingots, melted by the method of nonconsumable-electrode arc remelting in a skull furnace

Authors
O.Ye. Kapustian1, I.A. Ovchynnykova2
1Zaporizhzhia Polytechnic National University. 64 Zhukovsky Str, 69063, Zaporizhzhia, Ukraine. E-mail: aek@zntu.edu.ua
2Zaporizhzhia National University. 66 Zhukovsky Str, 69063, Zaporizhzhia, Ukraine. E-mail: iaov31@gmail.com

Abstract
The possibility of manufacturing deformed semi-finished products in the form of rods of zirconium β-alloy from ingots produced by nonconsumable-electrode arc remelting in a skull furnace was studied. Ingots of 50 mm diameter were produced by single remelting of an uncompacted charge. Hot deformation of the ingots to produce 30 mm diameter rods was performed by forging in a pneumatic forging hammer. Ingot forging modes are given. Performed hot deformation processing of zirconium alloy ingots led to cracking of the forging. Cracks developed in chaotically located zones. «Outer simple» cracks of up to 5 mm depth prevail by the location and shape. Structural studies of metal of an ingot of experimental zirconium alloy of Zr‒Nb‒Ti system, produced by the method of nonconsumable-electrode arc remelting in a skull furnace, revealed absence of micropores, cracks or other defects. The method of X-ray microprobe analysis was used to establish the presence of a phase with higher zirconium concentration and 2.5…3.0 times lower concentration of titanium and niobium, compared to the matrix phase. Phase size was from 1 to 30 μm. In order to produce an ingot with the specified homogeneous chemical composition, it was proposed to apply double remelting: use consumableelectrode vacuum-arc remelting after nonconsumable-electrode arc remelting in a skull furnace. Ref. 14, Tabl. 2, Fig. 7.
Keywords: vacuum-arc remelting; zirconium alloy; ingot; chemical composition; structure; deformation processing; forging; semi-finished productss

Received 20.05.2021

References

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