부산대학교 도서관

The main aim of the research described in this paper is to develop a set of mechanism-based unified viscoplastic constitutive equations to model the damage and dislocation development in cold deformation and their recovery by annealing. In addition, recrystallisation of the deformed material during the subsequent annealing process is modelled. The annealing temperature was 700°C. The effects of annealing time on damage and dislocation reduction during annealing are also investigated. Tensile tests were performed on a low carbon ferritic steel before and after annealing. The experimental results are used to characterise the unified constitutive equations using an Evolutionary Programming (EP)-based optimization method. Using these equations, the stress-strain relationships for interrupted constant strain rate tests, were predicted with good accuracy. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]