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.

Flow Stress and Mathematical Model for DRX Evolution of Semi-continuous Cast AZ80 Alloy During Hot Deformation

“…The vast majority of material models are much of a muchness as the empirical equation established by R.Kopp [17]. In this paper, DRX and equation of grain growth of AZ80 hot deformation process are studied with the model established by R.Kopp.…”

Rolling Technology and Theory for the Last 100 Years: The Contribution of Theory to Innovation in Strip Rolling Technology

“…Therefore, the technique to calculate the change of the internal micro structure depending on the history of stain velocity and rolling temperature was necessary and some techniques were suggested in the 1990s. [124][125][126] In addition, the internal micro structure of material after hot rolling changes while cooling down. The model to analyze the incremental phase transformation for the purpose of the nucleation mechanism in the grain boundary was formulated by Yanagimoto and others, based on the models 127,128) targeted at the plain carbon steel for ferrite, pearlite, and bainite transformation.…”

Current Trends in Cross Wedge Rolling for Part Forming

“…Nowadays, many research reports on the wire-rod rolling have taken up. [58][59][60] However, few the researches about the CWR simulation are discussed because of the complex process from the specialized die design, the numerical abstraction of the actual rolling, the deforming feasibility to products quality and capability.…”