Non-Steady-State Creep Behavior in Tube Gas Forming

Wu, Xin

doi:10.1007/s11665-007-9077-4

Cited by 11 publications

(4 citation statements)

References 32 publications

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“…For aluminum and magnesium tubular components, hot metal gas forming (HMGF) with higher forming temperature has also been developed using low internal pressure gas, which has drawn much attention due to the advantage of high efficiency [5,6]. Wu [7] reported the HMGF mechanism of Mg-alloy tubes. Kim [8] fabricated an aluminum suspension component by HMGF at 520°C under a constant gas pressure of 7 MPa.…”

Section: Introductionmentioning

confidence: 99%

Effect of feeding length on deforming behavior of Ti-3Al-2.5 V tubular components prepared by tube gas forming at elevated temperature

Liu

Wang

et al. 2015

Int J Adv Manuf Technol

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In order to investigate the deforming behavior of the tubular components with a large expansion ratio fabricated by tube gas forming technique, the Ti-3Al-2.5 V tubular components with 50 % expansion ratio were studied under the forming conditions of internal pressure and axial feeding at 800°C. Through thickness measurements, EBSD and tensile tests, the effects of axial feeding on deforming behaviors, such as thickness distribution, microstructure, and mechanical properties of Ti-3Al-2.5 V tubular components, were investigated in details. The results showed that the average thinning ratio of the bulging area could be reduced significantly and the thickness distribution of the workpiece was more uniform with increasing of the feeding. Feeding length influenced the microstructure and strength of components. When the axial feeding ratio (actual feeding length/theoretical feeding length) was 56 %, the component had even higher tensile strength than the original tube because of the grain refinement. If the axial feeding was excessive large, the grain size became adversely coarser, which in turn reduced the tensile strength. These investigations illustrated that tube gas forming under high pressure had potential for fabricating complicated shaped titanium alloy tubular components by reasonably designing and controlling the deforming process.

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Section: Introductionmentioning

confidence: 99%

Effect of feeding length on deforming behavior of Ti-3Al-2.5 V tubular components prepared by tube gas forming at elevated temperature

Liu

Wang

et al. 2015

Int J Adv Manuf Technol

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“…Distinguished from traditional superplastic forming, the process was named hot metal gas forming (HMGF). X. Wu reported the deformation mechanism of HMGF of Mg-alloy tube and pointed out that the final microstructure is affected by non-uniform temperature and non-uniform strain [10]. M. Liewald showed a ZM21 Mg-alloy square box produced by HMGF with expansion ratio of 94% and thinning ratio of 35% [11].…”

Section: Introductionmentioning

confidence: 99%

Progress on High Pressure Pneumatic Forming and Warm Hydroforming of Titanium and Magnesium Alloy Tubular Components

Liu

Wang

et al. 2014

MSF

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Complex structural tubular components of Titanium and Magnesium alloy can be obtained at a certain temperature by high pressure pneumatic forming (HPPF) with gas medium or warm hydroforming with pressurized liquid medium. At 800°C, through experimental research on HPPF of TA18 Ti-alloy tube with expansion ratio of 50%, the influence of axial feeding on thickness distribution of the workpiece was studied. Using reasonable loading curve, the component with large ratio can be formed with a small thinning ratio as 13% with total axial feeding amount of 40mm. At 850°C, HPPF experiments of TA18 Ti-alloy component with square section were carried out. The influence of gas pressure on thickness distribution and corner filling process were analyzed. The larger the pressure, the sooner the displacement changes at the corner, and the shorter corner filling term. At pressure of 30 MPa, small corner with the relative corner radius of 2.0 can be obtained within 168s. For Mg-alloy tubular part, warm hydroforming with non-uniform temperature field was studied. By using reasonable axial temperature field and loading path, the maximum thinning ratio of Mg-alloy tubular component with expansion ratio of 35% was reduced from 21.6% to 11.6%.

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“…Although the ductility of the aluminium alloy tubes is heightened by increasing the forming temperature, pressure media such as oil and water used in the hydroforming have limitations of the heating temperature [6,7]. To increase the forming temperature, a hot gas forming process was developed [8][9][10]. Although this process is similar to the hydroforming, the limitation of the heating temperature is removed by the use of gas.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of Condition in Hot Gas Bulging of Aluminium Alloy Tube Using Resistance Heating Set into Dies

Maeno

Mori

Unou

2011

KEM

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A hot gas bulging process of an aluminium alloy tube using resistance heating set into a die was developed. In the developed process, the tube was heated during the forming, and thus the drop in temperature was prevented. The control of the hot gas bulging was simplified by sealing air in the tube. The tube was bulged by thermal expansion of the air sealed in the tube without control of internal pressure during the forming. Hot gas bulging of an aluminium alloy tube without and with the axial feeding was performed. The deformation behaviour of the tube in the die was observed by a heatproof glass plate inserted in the die. The timing of the axial feeding, the feeding velocity and the amount of the axial feeding were optimised.

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Non-Steady-State Creep Behavior in Tube Gas Forming

Cited by 11 publications

References 32 publications

Effect of feeding length on deforming behavior of Ti-3Al-2.5 V tubular components prepared by tube gas forming at elevated temperature

Effect of feeding length on deforming behavior of Ti-3Al-2.5 V tubular components prepared by tube gas forming at elevated temperature

Progress on High Pressure Pneumatic Forming and Warm Hydroforming of Titanium and Magnesium Alloy Tubular Components

Optimisation of Condition in Hot Gas Bulging of Aluminium Alloy Tube Using Resistance Heating Set into Dies

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