High temperature deformation behavior and processing map of TA10 titanium alloy EB ingot
TA10 titanium alloy is currently known as the most competitive corrosion-resistant titanium alloy.This alloy plate ingots obtained from single melting in an electron beam cooling bed(EB)furnace were regarded as the research object.Isothermal compression tests within a high and wide strain rate range(0.01-30 s-1)were carried out on the Gleeble-3800 thermomechanical simulator to investigate the high-temperature mechanical behavior characteristics and the as-cast macro-and micro-structural evolutions of the tested alloy at deformation amount of 60%under temperature range from 800 ℃ to 1000℃.The high-temperature plastic constitutive equation based on peak stress was established.Hot processing maps considering strain were constructed to deeply discuss the relationship between the energy dissipation efficiency factor and the macro-/micro-structure,as well as the mechanical response.The results reveal that the flow stress of TA10 titanium alloy decreases with increasing deformation temperature or decreasing strain rate.The peak stress exhibits a linear relationship with the deformation temperature when the deformation temperature is above or below the β transus temperature.The Arrhenius equation is proven effective in predicting the variation in deformation resistance based on process parameters for this alloy.It is recommended to use this alloy for forming processes with medium deformation amounts and lower strain rates,while avoiding single-pass large deformation amounts.Alternatively,high-speed and multiple-pass small deformation amount methods can be explored for forming purposes.Additionally,it is determined that the flow softening mechanism of this alloy during hot deformation at lower strain rates in the two-phase region involves dynamic globularization or plastic flow localization.However,in the case of hot deformation at higher strain rates,the main reason for the phenomenon of stress collapse is macro instability.Lastly,it is found that the softening mechanism in the single-phase region is primarily due to dynamic recovery.
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