Superplastic-like forming of non-superplastic AA5083 combined with mechanical pre-forming

Liu, Jun; Tan, Ming Jen; Aue‐u‐lan, Yingyot; Jarfors, Anders E. W.; Fong, Kai‐Soon; Castagne, Sylvie

doi:10.1007/s00170-010-2729-9

Cited by 37 publications

(22 citation statements)

References 19 publications

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“…By varying the temperature in ABAQUS, the thickness of final formed parts can be predicted with respect to blow forming conditions. Compared to the experimental result [7], the thinning is consistent with the simulation prediction, while the sharp thickness reductions at the corners are also found. 4 that the thickness distribution are mainly presented uniformly, expect the areas where the sheet is in contact with the die corners.…”

Section: Stable Forming Temperaturesupporting

confidence: 85%

“…[7], an almost fully formed AA5083 sheet with height of 92% was obtained by using the superplastic-like forming process at 400°C. The value used for the maximum SPF pressure is 4.2 MPa.…”

Section: Gas Blow Forming At Specific Temperaturesmentioning

confidence: 99%

“…Conventional superplastic forming has been modified to increase the productivity and reduce some of the drawbacks, such as high percentage thinning to suit the automotive industries [6]. One of the modifications is to combine between the conventional SPF and the use of a non-superplastic AA5083 sheet [7]. In the process, experimental trials have shown the feasibility of using the combined process to fabricate the non-superplastic sheet into a complex shaped part at 400°C.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Finite Element Modeling of a Non-Isothermal Superplastic-Like Forming Process

Liu¹,

Tan²,

Castagne³

et al. 2011

AIP Conference Proceedings

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Conventional superplastic forming (SPF) has been modified to increase the productivity and reduce some of the drawbacks, such as high forming temperature and high percentage thinning, to suit the automotive industries. One of the modifications was to combine between the conventional SPF and the use of a mechanical preformed blank to form the nonsuperplastic grade aluminum alloy (AA5083-O). The requirement of high temperature usually results in microstructural defects during forming process. In this paper, finite element modeling was adopted to investigate the superplastic-like forming process using the non-isothermal heating system. In the simulation, two phases (mechanical pre-forming and gas blow forming) of the process were conducted under different temperatures, where the material was mechanically drawn into the die cavity at 200°C in the first phase, and it formed with gas pressure applied at a global temperature increasing from 400°C to 500°C. Because of the non-isothermal heating of material, it was found that it had enough ductility to flow more easily in the specific zones (die corners and radius). Additionally, FEM results showed that a better formed part can be obtained by the increasing temperature forming, compared to the stable temperature phase.

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Section: Stable Forming Temperaturesupporting

confidence: 85%

“…[7], an almost fully formed AA5083 sheet with height of 92% was obtained by using the superplastic-like forming process at 400°C. The value used for the maximum SPF pressure is 4.2 MPa.…”

Section: Gas Blow Forming At Specific Temperaturesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Finite Element Modeling of a Non-Isothermal Superplastic-Like Forming Process

Liu¹,

Tan²,

Castagne³

et al. 2011

AIP Conference Proceedings

Self Cite

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“…However, low production rate due to slow forming process and variable wall thickness inhibit the further application of superplastic forming. A lot of works have be done aimed to decrease the manufacturing time while maintain the integrity of the produced parts [1][2][3][4]. Here, three solutions are summarized for achieving this aim.…”

Section: Introductionmentioning

confidence: 99%

Development of a strain dependent pressure law for superplastic forming of 2024 aluminium alloy

Feng

Giraud

et al. 2017

Materialwissenschaft Werkst

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Superplastic forming is widely used in aeronautic industry to produce complex parts due to the ability of the material to sustain very large deformation. One of the main problems lies in the determination of the pressure law applied during the process to control the strain rate evolution. Many algorithms exist in numerical codes to predict the pressure law, but they generally use a constant value of maximum strain rate as reference to control the pressure law. These simulations give globally good results while lead to long cycle times. In this work, the pressure law is computed in order to control the forming process by a non‐constant strain rate. The value of the optimum strain rate is indeed adapted to the level of strain developed within the part during the forming. This approach is applied on the 2024 aluminium alloy. Uniaxial tensile tests are performed to determine the influence of strain level on the maximum allowable strain rate. Then, the new pressure control algorithm is implemented in the ABAQUS code. Numerical simulations of generic parts are finally performed and the results show a significant reduction of the forming time without decreasing the quality of the parts.

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“…Dykstr [8], W. Xin [9], and B. Dykstra [10] set up hot metal gas forming (HMGF), and mainly investigated and applied the process on forming of aluminum and magnesium alloy components. J. Liu [11,12], utilizing the mechanical pre-forming, investigated the AA5083 sheet gas forming using argon gas at 400°C. W.J.…”

mentioning

confidence: 99%

Loading path and microstructure study of Ti-3Al-2.5V tubular components within hot gas forming at 800 °C

Liu

Wang

et al. 2016

Int J Adv Manuf Technol

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Hot tube gas forming is a forming technology, whose ultimate goal is forming a uniform cross-section blank tube into a complex shape die cavity with varying crosssections without necking, wrinkling, or buckling by applying of axial feeding and internal pressure at elevated temperature. In this paper, the effects of feeding speed and internal pressure on the quality of formed tubular components were studied by theoretical analysis, FEM simulation, and experiment. The microstructure evolutions at four typical positions were analyzed by electron back-scattered diffraction (EBSD). The mechanical properties of tubular component were tested by the uniaxial tensions and hardness tests. A good tubular component can be formed under a two-stage loading path at 800°C, the feeding speed is 0.1 mm/s and the internal pressure is 5 MPa during the first feeding stage while the feeding speed is 0.2 mm/s and the internal pressure is 7 MPa during the second feeding stage. At the forming zone, the grains are significantly elongated along the hoop direction. Compared with the as-received tube, the tensile strength of parts reduces about 6 % along axial direction.Titanium alloys are found extensive applications including aerospace, marine, chemical, and medical industries due to their excellent properties such as good high temperature performance, high specific strength, good creep resistance, biocompatibility, and good corrosion resistance [1]. Ti-alloy complex tubular components are widely used in petrochemical equipment, vehicle exhaust system, sports equipment and piping system of ship, air-inlet system, and hydraulic control system of aerospace and aviation [2, 3]. However, for titanium alloy, it is hard to be formed at room temperature because of high springback and low plasticity. The problems can be counteracted by improving the forming temperature. In recent years, superplastic forming (SPF) were popularly used to form complex components at elevated temperature [1,4,5]. Nevertheless, the disadvantages of localized thinning, expensive microstructure refining processing, low productive efficiency, and high deforming temperature in superplastic forming limit applications of Ti-alloy SPF. Thus, it is urgent need to develop a forming technology with low energy consumption, high efficiency, and without microstructure refining processing.Quick plastic forming, developed by General Motors to form AA5083 aluminum automobile body panels, affords comparable capabilities yet at higher production rates due to lower forming temperature, higher strain rates, and without refining grains [5,6]. R. Neugebauer [7], A.W. Dykstr [8], W. Xin [9], and B. Dykstra [10] set up hot metal gas forming (HMGF), and mainly investigated and applied the process on forming of aluminum and magnesium alloy components. J. Liu [11,12], utilizing the mechanical pre-forming, investigated the AA5083 sheet gas forming using argon gas at 400°C. W.J. Kim [13] formed an Al-Mg-Cr aluminum suspension component successfully at 520°C under a constant gas pressure of 7 MPa d...

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Superplastic-like forming of non-superplastic AA5083 combined with mechanical pre-forming

Cited by 37 publications

References 19 publications

Finite Element Modeling of a Non-Isothermal Superplastic-Like Forming Process

Finite Element Modeling of a Non-Isothermal Superplastic-Like Forming Process

Development of a strain dependent pressure law for superplastic forming of 2024 aluminium alloy

Loading path and microstructure study of Ti-3Al-2.5V tubular components within hot gas forming at 800 °C

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