Model for integrated process and microstructure simulation in hot forming

Abstract

The paper presents a model offering improved implementation of material behaviour in plastomechanical simulations of hot-forming processes. Microstructural states at any instant during forming are evaluated successively on the basis of semi-empirical equations determining the state of dynamic recrystallization, and the corresponding flow stress is inferred. Upsetting tests were used to determine the characteristic data for a Cr-V steel in a spectrum of ט = 830–1150°C, ∊ = 0.05–5 s−1 and dγo = 70–108μm. The developed model is used to simulate upsetting tests, validating its accuracy in terms of structural description and flow-stress determination.