Simulation of central crack closing behavior during ultra-heavy plate rolling

The closing behavior of internal crack in the central of a continuous casting steel slab during rough transverse rolling was investigated using FE-code, ANSYS/LS-DYNA. Process parameters of ultra-heavy Q345 steel plate obtained from a Chinese iron and steel works were used as a reference. The results indicate that xi, xi(r,e), eta(r,s,e), m and r are main influence parameters on crack closing during ultra-heavy plate rolling. The larger of xi, xi(r,e), m and the smaller of eta(r,s,e), the more advantageous it is to crack closing. With other conditions unchanged, larger r is beneficial to close crack. For the rough transverse rolling process of 140 mm ultra-heavy plate in the works, the results reveal that the minimum r needed for rectangular crack closing is about 13.9%, which is 4% higher than that determined by the upper-bound triangular velocity field. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.