Microstructure Evolution Researchs On TA9Titanium Alloy In Hot Deformation

TA9titanium alloys have excellent corrosion resistance by adding a small amount of Pd. Inparticular, there were no harmful elements Al and V. TA9titanium alloys will become kinds ofhigh-quality materials which are uesd in biomedical instead of pure titanium and Ti-6Al-4V.The microstructure evolution during thermal deformation is very complicated. Using numericalmethods to investigate the microstructure evolution is important in predicting, controling themicrostructure and optimizing the process parameters. In this paper, by establishing several numericalsimulation methods: monte carlo potts model, topological model, phase-field model,cellular automatamodel and finite element model, single-phase and two phases grain coarsening, dynamicrecrystallization were simulated. Finally, by comparing the advantages and disadvantages of differentsimulation methods, cellular automata method was selected in the work.By using cellular automata method and Matlab programming language, grain growth model,second phase particles pinning model, dynamic recrystallization model were established. Anisotropicgrain growth of pure titanium and TA9titanium alloys, dynamic recrystallization of TA9titaniumalloys were investigated. Meanwhile, heat treatment experiments and hot tensile test under differentdeformation conditions were studied; finally simulation and experimental results were compared. Theresults show that the cellular automata model accurately reflected the thermoplastic deformation lawof TA9titanium alloys, which are beneficial for predicting and controlling the microstructure.