The Paton Welding Journal, 2023, №12



2023 №12 (04)

DOI of Article 10.37434/tpwj2023.12.05

2023 №12 (06)

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The Paton Welding Journal, 2023, #12, 39-49 pages

Investigations of the quality of metal of high-manganese steel alloyed by aluminium and chromium after electroslag remelting

V.A. Zaitsev, Yu.V. Kostetskyi, G.O. Polishko, V.A. Kostin, V.P. Petrenko, E.O. Pedchenko

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Abstract
The paper presents the results of investigation of the influence of electroslag remelting on the properties of metal of ingots of high-manganese steel, alloyed by aluminium and chromium. Features of structure formation in high-alloy manganese steels are considered. These steels demonstrate ductility and lower density, alongside strength, and are difficult to cast alloys, prone to hot cracking, formation of a coarse structure and development of macro- and microliquation. Studies have been performed, which confirm the conclusions that steels of this type require a thorough control of solidification conditions. Obtained results illustrate a significant influence of the cooling rate on cracking, manganese and aluminium segregation and parameters of the alloy dendritic structure. Electroslag remelting resulted in improvement of the structure and led to reduction of the size of non-metallic inclusions in the studied metal without any significant changes in Mn, Al, Cr content, which is one of the conditions for producing large-sized homogeneous ingots. Metallographic investigations showed that the microstructure of all the studied steel samples is characteristic for austenitic steel with dendritic crystal growth. Dendritic structure in the metal of EBM ingot is homogeneous, distances between first and second order axes in the ingot middle and upper parts are equal to 136.6…146.5 and 60.54…8.92 μm, respectively. Completion of formation of the required final microstructure of the studied steel takes place after further heat and thermodeformational treatment. EBM of cast billets allows reaching the required level of metal homogeneity and specified level of properties in the final product with a smaller number of stages and duration of thermomechanical treatment, and reducing resource consumption. 32 Ref., 1 Tabl., 9 Fig.
Keywords: high-strength light steel, ingot, electroslag remelting, microstructure, liquation, phase composition

Received: 05.09.2023
Accepted: 26.12.2023

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