Evaluation of Deformation Characters in Edgesof Hot Rolled Slab by Lode Parameter

Abstract

The hot rolling processes of slabs have been simulated by 3-D explicit dynamics Thermal-mechanical Finite Element Model (FEM) to solve the problems of edge defects. It can analyze the deformation characteristics of rolling slabs, calculate Lode parameter values in rolling deformation zone and analyze the stress-strain state in the entrance and exit of the slabs edge. Because there are the relationship between plastic deformation types and Lode parameter, and the quantitative relation metal flow and various Lode parameter. Results showed that there are complicated metal flow and various Lode parameter values in the edge of rolling deformation zone. Although there stress-strain states are various in the entrance and exit of the slab edges the μdε<0, the tensile strain increment in the direction of max principle strain was bigger than another two directions and the edges had the character of tensile deformation. This is the major cause that edge of slab is more defects than other zone.