Method for predicting coupling responses of isothermal forming and dynamic recrystallization evolution of titanium alloys

Abstract

The invention provides a method for predicting coupling responses of isothermal forming and dynamic recrystallization evolution of titanium alloys. Grain stress responses, intercrystalline non-uniform deformation and non-uniform dislocation density caused by intercrystalline non-uniform deformation are obtained in an isothermal forming process of the titanium alloys and are adopted as variables and transmitted to a cellular automaton, dynamic recrystallization evolution of the grain size under the condition of non-uniform size deformation is obtained, and dynamic recrystallization nucleation and grown structure morphology as well as grain boundary evolution and updated dislocation density which are caused by the dynamic recrystallization nucleation and grown structure morphology are obtained. The obtained grain and grain boundary information including dynamic recrystallization nucleation and growth as well as the dislocation density is returned to a crystal plasticity finite element method, dislocation gliding resistance of each grain unit is updated, so that subsequent deformation of the titanium alloys is influenced, and the stress responses of the grain size are calculated according to the constitutive relation. The method realizes synchronous prediction of non-uniform deformation of the grain size in isothermal forming of the titanium alloys, dynamic recrystallization structure morphology evolution, recrystallized grain size evaluation, recrystallization kinetics, deformable bodies and grain flow stress.

Description

technical field

[0001] The invention relates to the field of plastic processing, specifically a method for predicting the coupling response of titanium alloy isothermal forming and dynamic recrystallization evolution Background technique

[0002] Isothermal forming technology is an effective way to realize the formability, integration and precise manufacture of titanium alloy complex components. However, the isothermal forming of titanium alloy is an inhomogeneous deformation process under the action of multi-parameters and multi-field coupling. The strong inhomogeneous deformation makes the dynamic recrystallization nucleation and growth rules very complicated in the isothermal forming process of titanium alloys, and the dynamic recrystallization It also significantly affects the mechanical response of the titanium alloy, which in turn has a significant impact on the subsequent deformation and aggravates the inhomogeneity of the deformation. The coupling effect of isotherm...

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