University of Science and Technology MISIS, Moscow, Russia
B. A. Romantsev, Dr. Eng., Prof., Dept. of Metal Forming
M. M. Skripalenko, Cand. Eng., Associate Prof., Dept. of Metal Forming
V. A. Vorotnikov, Postgraduate Student, Dept. of Metal Forming
M. N. Skripalenko, Cand. Eng., Associate Prof., Dept. of Metal Forming, Expert of the Scientific Project, e-mail: tfsmn@yandex.ru

Computer simulation of AISI-321 steel billets screw rolling in MISIS-130D two-high mill at feed angles of 6, 12, 18 and 24 degrees at 1200 °C was carried out. Prior to computer simulation, presence of surface fine grain, intermediate and axial coarse grain zones in the billet cross section was detected as a result of experimental rolling. At that, it was established, on the basis of microstructure changing, that deformation non-uniformity decreases with the increasing of rolls feed angle value. Accumulated strain and temperature distribution for the billet cross section at the stationary stage were calculated as a result of computer simulation. It was established that absolute values of accumulated strain decrease with the rolls feed angle value increasing; but, at the same time, the range of accumulated strain decreases. This supports the tendency of strain non-uniformity decreasing revealed on the basis of microstructure analysis with the increasing of rolls feed angle. There is strong negative correlation between thickness of surface fine grain and intermediate zones and accumulated strain, and there is strong positive correlation between thickness of surface fine grain and intermediate zones and average billet temperature. Graphics illustrating changing of surface fine grain zone, intermediate zone and coarse grain zone thickness with the changing of accumulated strain and temperature were made. Considering the fact that accumulated strain can be used as a measure of shear strain, it was estimated how shear strain vary through billet cross section at the stationary stage with the increasing of rolls feed angle value.

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