St. Petersburg State Polytechnic University (St. Petersburg, Russia):

Matveev M. A., Post-graduate, Engineer, Scientifi c and Research Laboratory “Research and simulation of structure and properties of metal materials”, e-mail: matveev_ma@inbox.ru
Shishov I. A., Cand. Eng., Engineer, Scientifi c and Research Laboratory “Research and simulation of structure and properties of metal materials”
Mishin V. V., Cand. Eng., Assistant, “Technology and research of materials” Chair
Glukhov P. A., Post-graduate, Eng., Engineer, Scientifi c and Research Laboratory “Research and simulation of structure and properties of metal materials”

Severstal JSC (Cherepovets, Russia):

Korchagin A. M., Cand. Eng., Sr. Manager, Center of Technical Development and Quality (TsTRK)

Metal failure probability state-of-the-art technique assessment during hot rolling by means of combined physical and numerical simulation was developed. New technique application results for hot rolling of pipeline steel K60 on reversing mill 5000 are presented. Simulator Gleeble 3800 was used for hot ductility defi nition to provide the most thermomechanical treatment processes. Licensed Deform 3DTM software for Cockcroft-Latham failure criteria limit defi nition and for failure probability analysis during hot rolling was utilized. For studying relaxation processes taking a place during rough and final stages of rolling in edge and average temperature, AusEvol+ software was used. The stress relaxation level at stage of hot rolling was determined. Thus, the amount of relaxed metal should eff ect on metal behavior during hot rolling numerical simulation in Deform 3DTM software, and the Cockcroft-Latham failure criteria limit defi nition in rough stage at average temperature. Therefore, accumulated effective strain was zeroed after each rough pass during Cockcroft-Latham failure criteria calculating. In the numerical simulation of fi nish rolling passes and Cockcroft-Latham failure criteria calculating, also in edge area of sheet during rough rolling, when the stress relaxation does not occur, strain accumulation was taken into account. It was established that the steel has a high ductility during all rolling cycle and should not be destructed neither at edge, nor in base metal. Failure possibility can be initiated by the existence defects in initial slab and not optimized temperature and deformation schedules. Presented technique can be used for other metal plastic deformation applications.

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