Mesoscopic Simulation Of The Coupling Between Deformation And Phase Transformation In TA15Alloy

The computer simulation of the material microstructure transformation during hot deformation provided brand-new path on properties estimate and control and promoted the processing technology of material thermoplastic head for science theory craft from experience technique craft and become one of the research hot of the field of metal plastic deformation in the last years. The phase transformation is finding in the process of hot deformation, and the phase transformation and plastic deformation becomes synchronously carry on. During the phase transformation, the stored energy has been consumed, the process of deformation and phase transformation happened synchronously is different from the process of deformation and phase transformation happened in turn, the whole process is completely dynamic. Based on the earlier period related theory research, the research of titanium alloy phase transformation has already gradually from the metallographical examination and microstructural analysis etc. experiment research change in order to make use of some theory model of phase transformation classically, combine together calculator emulation and experiment research, the thorough research of the behavior of phase transformation and dynamics mechanism etc of titanium metal alloy heats in a row, continuous cool off and the processing process in isothermal has been done. This text exactly proceeds from the mesoscopic dimensions, based on the thermal deformation microstructure of new near a type TA15titanium alloy, comprehensive usage the theory of plastic processed, metal theory, the metallographical, the method of finite element, the crystal plastic deformation theory, and the cellular automaton, to the TA15titanium metal alloy the microstructure of deformation after and the phase transformation has been system researched, and the behavior of phase transformation and dynamic recrystallization has been simulated,.This processes the reasonable establishment of craft project to the heat and promote the development of titanium metal alloy and actual the application all has extremely important theory value and actual meaning.Based on the experiments of hot compression deformation on GleebIe-1500simulator, the hot deformation behavior of TA15titanium metal alloy has been researched. According to the metallographical microstructure, the influence regulation of deformation process parameters of temperature, strain rate and degree of deformation analysis qualitative and quantitative, the results shows that the peak stress and stable stress reduced with the increase of temperature or the decrease of strain rate. This for appointed it is reasonable of the heat process norm and excellent chemical engineering skill parameter to have an instruction function. Adopted an electron backscatter diffraction technique (EBSD) to characterized microstructure of TA15titanium alloy. The result shows that the microstructure not uniform during the processing of TA15titanium metal alloy heat deformation, this is also why the follow-up organization imitates to set out to imitate the asymmetry root reason that the plastic deformation from the mesoscopic dimensions.Based on the beginning miscrostructure of TA15titanium alloy by the cellular automaton, and the different grain orientation by the electron backscatter diffraction technique, the simulation model of crystal plasticity finite element has been build. The distribution characteristics of stress, strain and stored energy has been analysis, and the slip system during plastic deformation has been discussed. The results shows that the stored energy of deformation can be used to characterized the in homogeneity, and provide physical foundation for the simulation of crystallization and phase transformation follow-up.Based on the consideration of deformation in homogeneity during phase transformation and recrystallization in TA15titanium alloy, the model of phase transformation and recrystallization on mesoscopic dimensions has been build coupling between finite element method and cellular automaton. Compared the experiment result with the simulation result, the model coupling between finite element method and cellular automaton was reasonable, and the simulation microstructure was matched with experiment microstructure, for the control product quality, instruction production and optimization process have important meaning.