Cellular Automaton Simulation of Dynamic Recrystallization Behavior in BT25 Titanium Alloy

doi:10.3901/JME.2020.20.066

Abstract

Abstract: In order to study the effect of thermal processing parameters on microstructure of titanium alloy during plastic forming, the single-pass isothermal constant strain compression test of BT25 titanium alloy is carried out by Gleeble-3500 thermal simulation machine. The true stress-strain curves are analyzed and the dynamic equation of JMAK recrystallization is established. Based on analysis of thermal deformation behavior, dislocation density model, recrystallization nucleation model and grain growth model are derived. A cellular automata (CA) model is established through the algorithm to simulate and verify the dynamic recrystallization(DRX) behavior of BT25 titanium alloy during thermal deformation. The results show that the flow stress of BT25 titanium alloy is very sensitive to the strain rate and deformation temperature. Increasing deformation temperature or decreasing strain rate is beneficial to dynamic recrystallization of materials. The CA model simulated the grain size about the error is 3%, and predicted the DRX volume fraction about error within 10%. This model has good prediction accuracy. A reliable basis is provided for optimizing technological parameters and controlling microstructure evolution of forging in the process of plastic machining.

Key words: BT25 titanium alloy, thermal deformation, dynamic recrystallization, cellular automata, numerical simulation

CLC Number:

TG146

FENG Rui, WANG Kelu, LU Shiqiang, LI Xin, OUYANG Delai, ZHOU Xuan, ZHONG Mingjun. Cellular Automaton Simulation of Dynamic Recrystallization Behavior in BT25 Titanium Alloy[J]. Journal of Mechanical Engineering, 2020, 56(20): 66-73.

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