Modeling of hot rolling texture in CM-2A molybdenum alloy using a cellular automaton

Abstract

A combined model of plastic deformation and recrystallization was developed and verified to predict the evolution of crystallographic texture during annealing and hot rolling of CM-2A molybdenum alloy. The model takes into account the activation of the {110}<111>, {112}<111>, and {123}<111> slip systems, strain accumulation, and the nucleation and growth of nuclei misoriented relative to the deformed matrix. The nucleation and growth parameters were calibrated using literature data on static recrystallization and critical degrees of deformation of pure molybdenum and then verified using experimental kinetic recrystallization curves. Various hot rolling schemes were simulated, which made it possible to reproduce the main patterns of γ-fiber formation, {100}<110> and {111}<110> texture components, and the effect of temperature and degree of deformation on the proportion of the recrystallized component. The obtained results demonstrate the applicability of the developed model for analyzing texture formation during deformation and dynamic recrystallization, which allows its use in optimizing process routes for the manufacture of isotropic molybdenum sheets.