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• W4283642072 abstract "Ti-6Al-4V profiles prepared by hot extrusion are usually accompanied by bending and twisting. The hot twist-stretch straightening is an effective strategy such that the bending deflection and twisting angle can be simultaneously decreased by a single straightening process. In addition, utilizing stress relaxation effect, the residual stress and springback can be greatly reduced by holding the straightening temperature and strain constant for a period after twist-stretch straightening. In this study, the hot deformation behaviors of the Ti-6Al-4V profile were revealed by experiments. The tensile model was obtained by uniaxial tensile tests within ranges of temperatures (500-700 °C) and strain rates (5 × 10-5-1 × 10-3 s-1). The creep constitutive model was acquired with stress relaxation experiments in ranges of temperatures (500-700 °C) and pre-strain of 1.5%. Then, the coupled thermo-mechanical model of hot twist-stretch straightening was established. Based on orthogonal experiment strategy, the effects of straightening temperature, stretch strain, and holding time on the bending deflection and torsion angle of profile were investigated systematically and the process was optimized. The straightening accuracy is significantly affected by straightening temperature and holding time. By using optimized process parameters in practical straightening experiments, the deflection/length and angle/length after straightening does not exceed 2‱ and 2.5‱°/mm, respectively, which is basically consistent with the numerical simulation result." @default.
• W4283642072 created "2022-06-29" @default.
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• W4283642072 date "2022-06-27" @default.
• W4283642072 modified "2023-09-23" @default.
• W4283642072 title "Numerical Simulation and Process Optimization on Hot Twist-Stretch Straightening of Ti-6Al-4V Alloy Profile" @default.
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• W4283642072 doi "https://doi.org/10.3390/ma15134522" @default.
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