On the pressure forming of two superplastic alloys

Chockalingam, Kanmani; Neelakantan, M.A.; Saravanakumar, D.; Padmanabhan, K. A.

doi:10.1007/bf01026327

Cited by 17 publications

(9 citation statements)

References 16 publications

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“…7 forming. During SPF the initial forming rate was high and decreased gradually towards the end in accordance with what has been reported by several workers [11][12][13].…”

Section: Superplastic Forming Of Square Componentssupporting

confidence: 90%

Experimental studies on the superplastic forming of square shaped components from sheets of Ti-6Al-4V alloy

Rayudu

Bhattacharya

Deepkumar

2011

Trans Indian Inst Met

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Superplasticity is the ability of a polycrystalline material to exhibit, in a relatively isotropic manner, large elongations when deformed in tension. This property is exploited during superplastic forming in the fabrication of complex shaped components which are otherwise technically difficult or economically costly to form by conventional methods. The ability of some titanium alloys to undergo superplastic deformation coupled with their diffusion bonding capability (SPF/DB) provides excellent opportunities to fabricate intricate parts in a single operation resulting in significant cost and weight savings, particularly in the manufacture of aerospace structures. In the present work, experimental studies to characterize the superplastic behaviour of an as-received titanium Ti-6Al-4V alloy sheet commonly used in aerospace structural applications are reported. Tensile test coupons prepared from the alloy sheet were subjected to high temperature tensile tests in the temperature range of 1123 K (850°C) to 1223 K (950°C) and strain rate range of 10 -4 s -1 to 10 -2 s -1 in order to characterize the superplastic deformation behaviour. Suitable dies, for superplastic forming of 80 mm x 80 mm square components to depths of 43 and 50 mm, were designed and fabricated. Components were superplastically formed at a temperature of 1200 K (927°C) and 0.7 MPa constant argon pressure. The components were characterized for their thickness distribution, mechanical and metallurgical properties and the results are presented.

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“…7 forming. During SPF the initial forming rate was high and decreased gradually towards the end in accordance with what has been reported by several workers [11][12][13].…”

Section: Superplastic Forming Of Square Componentssupporting

confidence: 90%

Experimental studies on the superplastic forming of square shaped components from sheets of Ti-6Al-4V alloy

Rayudu

Bhattacharya

Deepkumar

2011

Trans Indian Inst Met

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“…If this friction is large, and thinning is localized in the region where no contact has been made, it will result in a greater level of strain in the final forming areas. The strain, strain rate, and stress state can vary widely in different regions of the superplastically formed part [8][9][10], where this also causes variable cavitation levels from one location to another. The interfacial friction would be reduced by use of a lubricant since continued metal flow would be possible for the overlaid region after die contact.…”

Section: Introductionmentioning

confidence: 99%

Cavitation behavior in superplastic 5083 Al alloy during multiaxial gas blow forming with lubrication

Sun

Lee

et al. 2009

International Journal of Machine Tools and Manufacture

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“…The study of superplastic forming process mainly contains the material selection [8], processing technique [6], and finite element modeling (FEM) [9]. FEM is a numerical method normally used to facilitate the SPF process design [10].…”

Section: Introductionmentioning

confidence: 99%

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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On the pressure forming of two superplastic alloys

Cited by 17 publications

References 16 publications

Experimental studies on the superplastic forming of square shaped components from sheets of Ti-6Al-4V alloy

Experimental studies on the superplastic forming of square shaped components from sheets of Ti-6Al-4V alloy

Cavitation behavior in superplastic 5083 Al alloy during multiaxial gas blow forming with lubrication

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

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