Influence of the mode of deformation on recrystallisation behaviour of titanium through experiments, mean field theory and phase field model

Abstract

The influence of the mode of deformation on recrystallisation behaviour of Ti was studied by experiments and modelling. Ti samples were deformed through torsion and rolling to the same equivalent strain of 0.5. The deformed samples were annealed at different temperatures for different time durations and the recrystallisation kinetics were compared. Recrystallisation is found to be faster in the rolled samples compared to the torsion deformed samples. This is attributed to the differences in stored energy and number of nuclei per unit area in the two modes of deformation. Considering decay in stored energy during recrystallisation, the grain boundary mobility was estimated through a mean field model. The activation energy for recrystallisation obtained from experiments matched with the activation energy for grain boundary migration obtained from mobility calculation. A multi-phase field model (with mobility estimated from the mean field model as a constitutive input) was used to simulate the kinetics, microstructure and texture evolution. The recrystallisation kinetics and grain size distributions obtained from experiments matched reasonably well with the phase field simulations. The recrystallisation texture predicted through phase field simulations compares well with experiments though few additional texture components are present in simulations. This is attributed to the anisotropy in grain boundary mobility, which is not accounted for in the present study.

Effects of Stress‐Aging Pretreatment on Hot Deformation Behavior and Microstructure Evolution of a Ni–Cr–Nb–Mo–Ti Alloy

“…In general, the superalloy components of aeroengines are mainly manufactured by hot forming technologies such as die forging, spinning, ring rolled, etc. [ 1–6 ] However, in the process of hot forming, the flow behavior of metals or alloys is very complicated, [ 7–10 ] and the inhomogeneous deformation of the billet will result in different dynamic recrystallization (DRX) degrees in different deformation regions of components. Then, an uneven distribution of grain structures appears after hot deformation.…”

Assessment of Flow-Line Model in Rolling Texture Simulations

“…Modeling the evolution of deformation texture in Al alloys by combining the basic principles of CP theories and models that are capable of predicting deformation flow is vital, since many crystallographic features evolved in deformation are directly linked to the evolution of recrystallization texture [19][20][21]. The latter determines plastic anisotropy and limits the forming characteristics of a material.…”

Deformation texture simulation in Al alloys: continuum mechanics and crystal plasticity aspects

“…Modeling the evolution of deformation texture during TMP, by combining basic principles of both CM and CP theories, is of crucial importance since our understanding of deformation enables explaining the mesoscopic scale's phenomena involved in recrystallization [23][24][25][26][27]. Employing CP theories allows modeling the anisotropy of plastic strain ratio, which is a decisive factor, particularly for deep-drawing qualities of Al alloys.…”