Siberian Federal University, Krasnoyarsk, Russia

S. B. Sidelnikov, Doctor of Technical Sciences, Professor of Metal Forming Department, e-mail: sbs270359@yandex.ru
E. S. Lopatina, Candidate of Technical Sciences, Associate Professor, Acting Head of for Metal Science and Heat Treatment of Metals Named after V. S. Biront Department, e-mail: eslopatina@mail.ru
A. V. Parubok, Post-Graduate Student of Metal Forming Department, e-mail: an-drej.parubok@yandex.ru
M. P. Bundin, Post-Graduate Student of Metal Forming Department, e-mail: mbun-din@sfu-kras.ru
I. L. Konstantinov, Candidate of Technical Sciences, Associate Professor of Metal Forming Department, e-mail: ilcon@mail.ru
V. V. Lopatin, Student, e-mail: 117ghost117@mail.ru

The article presents the results of studies of the structure and properties of industrial ingots made of AD31 alloy, which are modified with alloying rods obtained using the technology of ingotless rolling and extrusion (IRE) from scrap of extruded profiles made of AD31 alloy. This method and device are described for combining continuous casting, rolling, and extrusion operations in a single unit. As equipment for obtaining rods with a diameter of 9 mm from secondary waste of AD31 alloy, an experimental and industrial installation CRE-400 with a rolling roll diameter of 385 mm was used. For the production of rods, technological parameters of the IRE process obtained as a result of numerical modeling of the studied process were used. To produce ingots, the company used experimental and industrial equipment from United Company Rusal Engineering and Technology Center (RUSAL ETC). In the course of experimental studies, experimental ingots with a diameter of 100 mm were obtained from the AD31 alloy, modified with a rod made using the IRE technology from secondary waste of the AD31 alloy. Tensile tests were performed on these ingots, and the mechanical properties were obtained, as well as the macro- and microstructure of the metal was studied. It has been established that the introduction of a 3–4% AD31 rod made of the same alloy into the melt, obtained by the IRE method from the scrap of extruded profiles of the same alloy, reduces the grain size to 234–349 μm, depending on the conditions of the rod introduction and the choice of ingot casting parameters. Comparison with the initial macrostructure of the unmodified ingot showed that the introduction of a rod of the same composition obtained by the new method leads to the formation of a fine-grained structure of the ingot, which indicates the presence of a modifying effect when using a rod obtained by the IRE method. At the same time, the obtained high level of mechanical properties of the metal of these ingots makes it possible to use them for the production of extruded profiles from the AD31 alloy.

The work has been carried out with the financial support of the Russian Science Foundation and the Krasnoyarsk Regional Science Foundation under grant No. 24-29-20136.

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