Finite element simulation and process optimization for hot stretch bending of Ti-6Al-4V thin-walled extrusion

Guo, Guiqiang; Li, Dongsheng; Li, Xiaoqiang; Deng, Tongsheng; Wang, Shuo

doi:10.1007/s00170-017-0235-z

Cited by 14 publications

(5 citation statements)

References 11 publications

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“…The results show that selective heating has a certain influence on the quality of titanium alloy elbow. Guo et al 6 studied the influence of process parameters on the hot stretch-bending quality of thin-walled extruded Ti-6Al-4V alloy by finite element simulation method. It is found that increasing the preheating temperature of the profile and the initial temperature of the die can effectively reduce the springback.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the hot stretch-bending process for TC4 titanium L-section profile

Qiao,

Zhai,

Jin

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Titanium alloys are used more and more in the field of aerospace because of their low weight and high strength. Compared with pure bending, stretch-bending can effectively reduce springback and improve forming accuracy, and is widely used in the forming of high-quality profile structural parts. In this study, based on the loading method of the arm-type stretch-bending machine, the hot stretch-bending process of the TC4 titanium alloy profile with L-shaped section was simulated by ABAQUS. The effects of profile temperature, tension, and section size on the stretch-bending results were analyzed, and the process parameters were optimized. The experimental verification was carried out on the self-designed hot stretch-bending test machine, and the relative deviation between the experiments and simulations is within 1%. This study has guiding significance for the setting of process parameters of hot stretch-bending of titanium alloy profiles.

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Section: Introductionmentioning

confidence: 99%

Optimization of the hot stretch-bending process for TC4 titanium L-section profile

Qiao,

Zhai,

Jin

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The stress distribution and deformation springback of the profile were predicted and verified. Guo et al [17] considered heat conduction between the profile and die: the heat transfer coefficients were determined by inverse analysis and the non-isothermal FE model for hot stretch bending of the Ti-6Al-4V profile was established. The model indicated that temperature distribution would affect the springback value, improve the temperature of the die, and the profile could reduce springback.…”

Section: Introductionmentioning

confidence: 99%

“…The holding time should not be too long, otherwise the production efficiency will be reduced and the surface oxidation will be intensified. The holding time should not exceed 1200 s [17]. Zhang et al [19] studied the pre-stretching process of a large aluminum alloy sheet after quenching; the flatness could be significantly improved and most residual stress could be reduced after 1-3% stretch strain.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Process Optimization on Hot Twist-Stretch Straightening of Ti-6Al-4V Alloy Profile

Deng

Hui

et al. 2022

Materials

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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.

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“…Titanium alloys are highly used for the curvature structure of aircraft, like wings, reinforced frames, and other loading bearing components due to their excellent mechanical properties and electrochemical properties [1][2][3][4][5][6]. Hot stretch forming (HSF) was developed by Cyril Bath Company to solve the problem of poor formability of titanium alloys at ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

High Temperature Mechanical Properties and Microstructure Evolution of Ti-6Al-4V Alloy Linear Friction Welding Joints

Zhang

et al. 2022

Machines

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The combination of linear friction welding (LFW) and hot forming processes is limited due to a lack of research on the high-temperature flow behavior and microstructure evolution of welded joints. In this paper, an electric-assisted high-temperature uniaxial tensile test platform based on digital image correlation (DIC) is built, and uniaxial tensile tests of Ti-6Al-4V alloy with LFW joints are performed at different temperatures (923–1023 K) and different strain rates (0.001 s−1–0.01 s−1). Then the microstructure of the LFW joints under different hot deformation conditions have been analyzed by scanning electron microscope (SEM), electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The results indicate that the high-temperature flow behavior of LFW joints shows an obvious correlation between temperature and strain rate: the yield stress decreases from 203 MPa at 923 K to 105 MPa at 1023 K, and increases from 85 MPa to 130 MPa when the strain rate increases from 0.001 s−1 to 0.01 s−1 at 973 K. The hot deformation mechanisms with deformation conditions have been characterized, which changes from the mechanism of dislocation creep to the mechanism of self-diffusion as the deformation temperature increases from 923 to 1023 K. Especially, the fraction of high angle boundaries (HABs) rapidly rise from 49.2% to 64.1% with the increasing temperatures, the discontinuous dynamic recrystallization (DDRX) become the primary mechanism of nucleation during high-temperature deformation of LFW joints.

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Finite element simulation and process optimization for hot stretch bending of Ti-6Al-4V thin-walled extrusion

Cited by 14 publications

References 11 publications

Optimization of the hot stretch-bending process for TC4 titanium L-section profile

Optimization of the hot stretch-bending process for TC4 titanium L-section profile

Numerical Simulation and Process Optimization on Hot Twist-Stretch Straightening of Ti-6Al-4V Alloy Profile

High Temperature Mechanical Properties and Microstructure Evolution of Ti-6Al-4V Alloy Linear Friction Welding Joints

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