Ural Fereal University named after the first RF President B.N. Eltsin (Ekaterinburg, Russia):

Bogatov A. A., Dr. Eng., Prof., Head of the Chair of Metal Forming
Nukhov D. Sh., Junior Scientific Fellow, the Chair of Metal Forming
Leshchev I. V., Junior Scientific Fellow, the Chair of Metal Forming
E-mail (common): omd@urfu.ru

This paper provides (using literature data) information about the effect of plastic deformation on formation mechanism of submicrocrystalline steel structure. It is shown that development of the new technological metal forming schemes with advanced alternating deformation is rather prospective. The new method for rolling in two passes, providing intensive alternating deformation with small variation of billet dimensions is suggested. The results of computer simulation have shown that the new method can improve uniformity of reduction and deformation degree in the billet symmetric plane. Production of steels and alloys with ultra-fine grain structure via equiangular extrusion is connected with intensive alternating deformation. The rolling method for high billets, providing intensive alternating deformation in the first passes is proposed. Rational rolling procedures are determined via the method of computeraided simulation of conditions of grooves filling by metal in the 1^st pass and efficient billet flattening in the 2^nd pass. Reaching of uniform deformation degree after billet rolling can be estimated as advantage of the found procedures. Analysis of deformation degree distribution during 11 passes according to the existing heavy plate rolling procedure at 5000 mill of Magnitogorsk Iron and Steel Works and during 7 passes using 160 mm billet instead of 300 mm billet, have displayed that deformation degree in a billet symmetric plane increases by 15–20%, while deformation heterogeneity decreases by 6 times. It is concluded that usage of the new technological route for roughing rolling of 65 mm heavy plate during 7 passes leads to lowering of power expenses by 1.8 times.

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