An experimental study of hot rolling with low finishing temperature of an extra-low carbon steel.

摘要

For the purpose of improving the physical and mechanical properties of extra-low carbon electrical steels, rolling at low finishing temperatures is unavoidable. In order to overcome the attendant problems in gauge control, which are ascribed to the difficulty in accurate prediction of the flow stress in the two-phase region, two critical phenomena should be considered: (1) Under what circumstances will the phase transformation from ;To answer the first equation, the effects of initial grain size, cooling rate, deformation conditions and static recrystallization on the phase transformation temperature are investigated. It is shown that only two variables, residual strain and cooling rate, dominate the phase transformation temperature. When the residual strain is below a critical value, the Ar;Based on the assumption that the cooling rate varies linearly from the starting to the finishing point during phase transformation, thermal analysis of cooling curves is carried out and a variable X;The average flow stresses in the austenite and ferrite region are measured and modelled successfully by a neural network, called the flow network. The average flow temperatures in the roll bite under different conditions are calculated by a finite element program and the database is handled by a neural network, called the temperature network. The adapted geometric multipliers, Q