Computational study of Ti–6Al–4V flow behaviors during the twist extrusion process

Mousavi, S.A.A. Akbari; Shahab, A.R.; Mastoori, Mohammad

doi:10.1016/j.matdes.2007.07.009

Cited by 45 publications

(6 citation statements)

References 6 publications

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“…A solution for simple shear extrusion (SSE) was modelled by FE [6] in which the distribution of shear strain within the sample cross section was estimated. It was found that the shear strain is maximum in the sample center and gradually decreases toward the periphery which is in contrast to strain distribution in TE [7].…”

Section: Introductionmentioning

confidence: 78%

Finite Element Analysis of an Axi-Symmetric Forward Spiral Extrusion of Mg-1.75Mn Alloy

Farhoumand

Hodgson

Khoddam

2011

MSF

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A potential severe plastic deformation process known as axi-symmetrical forward spiral extrusion (AFSE) has been studied numerically and experimentally. The process is based on the extrusion of cylindrical samples through a die with engraved spiral grooves in a near zero shape change manner. The process was simulated using a three dimensional finite element (FE) model that has been developed using commercial software, ABAQUS. In order to verify the finite element results, hot rolled and annealed samples of the alloy were experimentally processed by AFSE. The required extrusion forces during the process were estimated using the FE model and compared with the experimental values. The reasonable agreement between the FE results and experimental data verified the accuracy of the FE model. The numerical results indicate the linear strain distribution in the AFSE sample is only valid for a core concentric while the strain distribution in the vicinity of the grooves is non axi-symmetric. The FE simulation results from this research allows a better understanding of AFSE kinematics especially near the grooves, the required extrusion force and the resultant induced strain distribution in the sample. To compare the mechanical properties of the Mg-1.75Mn alloy before and after the process, a micro shear punch test was used. The tests were performed on samples undergoing one and four passes of AFSE. After four passes of AFSE, it was observed that the average shear strength of the alloy has improved by about 21%. The developed finite element model enables tool design and material flow simulation during the process.

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Section: Introductionmentioning

confidence: 78%

Finite Element Analysis of an Axi-Symmetric Forward Spiral Extrusion of Mg-1.75Mn Alloy

Farhoumand

Hodgson

Khoddam

2011

MSF

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“…To compare the deformation behavior of LTE and NLTE processes, two typical elements of specimen were chosen at the inner and the outer sections of workpieces distinctively (see e.g., [25,26] for similar representation). The selected elements are highlighted in Figure 5.…”

Section: Resultsmentioning

confidence: 99%

Numerical Analysis of a New Nonlinear Twist Extrusion Process

Yalçınkaya

Şimşek

Miyamoto

et al. 2019

Metals

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Severe plastic deformation (SPD) can produce ultrafine grained (UFG) and nanocrystalline (NC) materials by imposing intense plastic strain. One of the many options for inducing large plastic strains is to pass the material through a torsional/twist extrusion. The high-strength materials fabricated by SPD has no limit in dimension, and they can even be applied to load-carrying structural materials. Even though the method is quite successful, the industrial transfer has been limited so far because of low production efficiency and high cost. To remedy such difficulties, a new torsional extrusion process called nonlinear twist extrusion (NLTE) is introduced in this study, which has been designed based on two principles; (1) linear arrangement of the production line and (2) effective die geometry resulting in higher and more homogeneous plastic strain evolution which would give better grain refinement. The initial computational study of the designed geometry for the new extrusion process is addressed in the current study. The obtained results are discussed in detail with respect to conventional extrusion process, which is referred to as linear twist extrusion (LTE). The method is expected to offer a great potential for industrial use.

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“…The numbers of passes were selected based on the previous reported results. 16,23 The experimental design matrix and experimental results are presented in Table 4. According to the experimental plan, a total of 20 experiments were conducted with three various values of input process variables A, B and C. Two repetitions of experiments per alignment were conducted and the average values of the output parameters are displayed in Table 4.…”

Section: Development Of Mathematical Modelmentioning

confidence: 99%

“…It was also reported that it is important to acknowledge that recent studies have demonstrated very clearly a great potential for the use of SPD processing and the incorporation of ECAP in industrial applications. Computational study of Ti-6Al-4V flow behaviors during the TE process was carried out by Akbari Mousavi et al 16 The TE process under high pressure was simulated using the finite element method (FEM). The Abaqus code was used for the FEM.…”

Section: Introductionmentioning

confidence: 99%

Modeling of twist extrusion process parameters of AA6082-T6 alloy by response surface approach

Iqbal¹,

Kumar

2014

Proceedings of the Institution of Mechanical Engineers, Part B:

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The fabrication of nanostructure materials using severe plastic deformation techniques with improved properties has received attention over the recent years. Twist extrusion has become one of the most widely spread techniques of the severe plastic deformation processes. This article reports the experimental investigations on the twist extrusion forming of AA6082-T6 aluminum alloy. The central composite design was utilized to plan the experiments, and response surface methodology was employed for developing experimental models. The forming load, temperature and number of passes were considered as input parameters in this study. The process performances such as tensile strength and hardness were evaluated. The results of analysis of variance indicated that the proposed mathematical models obtained can effectively describe the performances within the limits of factors being studied. The experimental values were in good agreement with the predicted values.

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Computational study of Ti–6Al–4V flow behaviors during the twist extrusion process

Cited by 45 publications

References 6 publications

Finite Element Analysis of an Axi-Symmetric Forward Spiral Extrusion of Mg-1.75Mn Alloy

Finite Element Analysis of an Axi-Symmetric Forward Spiral Extrusion of Mg-1.75Mn Alloy

Numerical Analysis of a New Nonlinear Twist Extrusion Process

Modeling of twist extrusion process parameters of AA6082-T6 alloy by response surface approach

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