Siberian Federal University, Krasnoyarsk, Russia:

V. N. Baranov, Assistant Professor, Director of the School of Non-Ferrous Metals & Materials Science1, e-mail: vnbar79@mail.ru
I. L. Konstantinov, Assistant Professor, Department of Metal Forming, e-mail: ilcon@mail.ru
S. B. Sidelnikov, Professor, Head of the Department of Metal Forming

RUSAL Bratsk Aluminium Smelter JSC, Bratsk, Russia:

E. Yu. Zenkin, Managing Director, e-mail: EvgeniyZenkin@rusal.com

The study of the cold rolling modes of the plates of aluminum alloy sparingly doped with scandium was performed. As a blank for rolling, a 60 mm thick semifinished rolled stock, obtained at one of the Russian metallurgical enterprises by hot rolling of a 1580 alloy ingot was used. At the first stage of the work, an experimental studies of cold rolling of the plates with different degrees of deformation in the laboratory conditions on a rolling mill DUO 330 with a body of roll of 520 mm long has been implemented to determine the critical value of overall reduction, causing the destruction of samples, which have showed that this value during cold rolling of the hotrolled semifinished material corresponds to 21–22%. At this degree of deformation, the alloy has high strength properties with a sufficiently high plasticity. Further increase in the deformation degree does not lead to a significant growth of strength properties, but can favor to the formation of cracks along the edge of the rolled stock. The hot-rolled semifinished material deformability has been tested in the range of the cold deformation degrees from 10 to 30% using the reduction modes obtained in laboratory conditions at the second stage of the work in order to test the technology of rolling the plates on an industrial mill with a body of roll of 2800 mm long and a billet width of 2000 mm. By the results of mechanical properties testing of the plates rolled with different deformation degrees, it is shown that cold rolling of a hot-rolled billet with deformation degree of 21–22% provides the following mechanical properties of the plates: t = 420 MPa; σ_0.2 = 380 MPa;  δ = 8%, and further increase of the cold deformation degree leads to an insignificant growth of strength properties (about 10 MPa).

This work was carried out under the project 03.G25. 31. 0265 “Development of sparingly alloyed high-strength Al-Sc alloys for use in motor transport and navifation” within the framework of the Program of implementation of complex projects on creation of high-tech production, approved by the Decree No. 218 of the Government of the Russian Federation of April 9, 2010.

The article is published as a platform for discussion.

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