Temperature Transition and Deformation Process of Inconel 718 During Radial Forging.

Isogawa, Sachihiro; Suzuki, Yoshito; Uehara, Norioki

doi:10.4262/denkiseiko.63.119

Cited by 3 publications

(4 citation statements)

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“…Because convective losses tend to be a small fraction of the total heat loss, heat transfer was assumed to be due to radiation only. In most radial forging analyses the effect of die chilling has been assumed to be negligible due to the relatively short time over which the die is in contact with the workpiece [2,5,6]. It has been estimated that the tools are in contact with the workpiece for less than lo-15% of each forging cycle [7].…”

Section: Thermal Boundarv Conditionsmentioning

confidence: 99%

“…In order to analyze the radial forging process and to gain a better understanding of the material flow and temperature fields developed in the billet during forging, it is necessary to develop a process model. While some finite element modeling (FEM) work has been performed [l-3], little success has been reported in directly validating FEM temperature and strain predictions in the billet, except through comparisons with microstructure and surface temperatures [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

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FEM Simulation of Multiple Pass Radial Forging of Pyromet 718

Domblesky¹,

Mohamdein²,

Drab³

et al. 1994

Superalloys 718, 625, 706 and Various Derivatives (1994)

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Radial forging of a small diameter Pyromet 718 billet was modeled under nonisothermal and axisymmetric conditions using a finite element approach. In this model, each stroke of the radial forging tools was modeled as a separate simulation. An implicit method was developed to account for the non-contact time of the forging tools between each deformation cycle in order to improve transient temperature predictions during each pass. An improved representation of the chuckhead constraint was also developed. A three pass forging sequence using Pyromet 718 billet was conducted to validate the finite element model. Results show that deformation was generally uniform and penetrated to the workpiece center though surface strains tended to be higher. Temperature distributions show that significant differences develop between the workpiece surface and the interior and are maintained during forging. Comparison of the finite element predictions and the experimental measurements for effective strain and temperatures showed acceptable correlation.

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Section: Thermal Boundarv Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

FEM Simulation of Multiple Pass Radial Forging of Pyromet 718

Domblesky¹,

Mohamdein²,

Drab³

et al. 1994

Superalloys 718, 625, 706 and Various Derivatives (1994)

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“…If the front-pull and back-push forces are not balanced with the axial force generated during forging, the part will be ejected from the forging box. The chuck-head restraint may be modeled by imposing zero axial velocity at the trailing end of the workpiece [15,16]. But this representation is not satisfactory because, in practice, the end of workpiece can move axially in both directions depending on the axial forging load and front-pull and back-push forces.…”

Section: Introductionmentioning

confidence: 99%

Die design for the radial forging process using 3D FEM

Ghaei

Movahhedy²

2007

Journal of Materials Processing Technology

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“…Alloy 718 billets have been generally forged by 2-ram press or 4-ram mechanical radial forging machine (GFM) (1)(2)(3)(4)(5)(6)(7)(8). In this study, 4-ram hydraulic radial forging machine, called SMX (by SMS EUMUCO Inc.), was used to forge Alloy 718 billets.…”

Section: Introductionmentioning

confidence: 99%

Grain Size Prediction of Alloy 718 Billet Forged by Radial Forging Machine Using Numerical and Physical Simulation

Kubota¹,

Ohno²,

Nonomura³

et al. 2001

Superalloys 718, 625, 706 and Various Derivatives (2001)

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Fine grains are required for Alloy 718 to obtain its high strength. Since grain size is strongly affected by forging conditions, many trial forgings are generally needed. On the other hand. grain size predictions by several simulations have been tried to reduce trial forgings. The purpose of this study is to predict grain size of Alloy 718 by combining a numerical simulation and a physical simulation. Firstly the transitions of temperature and strain of the forged material during hot forging were calculated by the 3-dimensional FEM. Secondly multi-stage plane strain compression tests using small test pieces were carried out by means of the Gleeble system according to the temperature and strain programs obtained by the numerical simulation, then the grain size was observed. These simulations were applied for predicting and refining the grain size of Alloy 718 billet forged by hydraulic 4-ram radial forging machine. Introduction Fine grains are required for Alloy 718 disks mainly used for gas turbines to obtain its high strength. To obtain the fine grain disks, it is necessary to refine the grains of the billets of which the disks are made by means of die forging. But it is difficult to refine the grains of large section size billets, especially at center position (1,2).Alloy 718 billets have been generally forged by 2-ram press or 4-ram mechanical radial forging machine (GFM) (1-8). In this study, 4-ram hydraulic radial forging machine, called SMX (by SMS EUMUCO Inc.), was used to forge Alloy 718 billets. SMX has advantages over the 2-ram press; its forging speed is higher and straighter and more truly round billet can be obtained. SMX also has advantages over GFM. The maximum load can be added throughout the full stroke by SMX whereas it can be added near the only bottom dead point by GFM. So the reduction in pass of SMX can be controlled, although that of GFM must be set a small value. Therefore SMX can easily control the forging conditions. These advantages are effective to obtain fine grains of all the regions of large section size billets.On the other hand, since grain size is strongly affected by the forging conditions, many trial forgings, which are very expensive especially for the high price materials such as Ni base superalloys and take much time, are generally needed to control the microstructure. Therefore grain size predictions by several simulations have been tried to reduce trial forgings (1,2:4-8). FEM (Finite Element Method) has been used to predict the strain and the temperature distribution and the microstructure including the grain size of forged products. Not only 2-dimensional FEM but also 3-dimensional FEM must be used for the forging by 2-ram press and 4-ram press, because the deformation behavior of these forgings is complicated. But grain size predictions only by FEM or other equations are difficult for highly-alloyed metals, because the grain growth and recrystallization behavior is very complicated. Especially, the grain sizes of Alloy 718 are strongly affected by the precipita...

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Temperature Transition and Deformation Process of Inconel 718 During Radial Forging.

Cited by 3 publications

References 0 publications

FEM Simulation of Multiple Pass Radial Forging of Pyromet 718

FEM Simulation of Multiple Pass Radial Forging of Pyromet 718

Die design for the radial forging process using 3D FEM

Grain Size Prediction of Alloy 718 Billet Forged by Radial Forging Machine Using Numerical and Physical Simulation

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