Tube cyclic expansion-extrusion (TCEE) as a novel severe plastic deformation method for cylindrical tubes

Babaei, Alireza; Mashhadi, Mahmoud Mosavi; Jafarzadeh, H.

doi:10.1007/s10853-014-8017-6

Cited by 34 publications

(11 citation statements)

References 26 publications

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“…It is worth mentioning that the refinement of grains/ crystallites during NCTS-CEC shows a sharp rate at the first cycle and gets a lower rate at the second cycle according to the fact that was approved in other SPD processes. 18,[33][34][35] The metallographic observations and the results of XRD analysis determine almost the same trend for the grain/crystallite size refinement, although they report different values for the grain/crystallite sizes. These differences are because of the fact that the XRD analyses give the size of the crystalline domains and a single grain usually contains several domains with different orientations.…”

Section: Resultsmentioning

confidence: 79%

“…14 Further efforts in this direction recently led to the presenting of several SPD methods for processing UFG and NS cylindrical tubes. 15 High-pressure tube twisting (HPTT), 16 accumulative spin-bonding (ASB), 17 tube channel pressing (TCP), 18 parallel tubular channel angular pressing (PTCAP), 19 tube high-pressure shearing (t-HPS), 20 tube cyclic expansion–extrusion (TCEE), 21 and rotary extrusion. 22 In recent years, environmental issues like environmental pollution, depletion in conventional energy reserves, and ever-increasing fuel prices necessitate the development of lightweight structures in automotive, space, and such like industries.…”

Section: Introductionmentioning

confidence: 99%

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Processing ultrafine grained non-circular cross-section profiles via severe plastic deformation

Babaei

Jafarzadeh

Mazloumbashiri

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this study, a new technique is presented for processing ultrafine-grained noncircular thin section profiles via severe plastic deformation. For the first time, a noncircular thin section profiles can be severe plastic deformation processed by this method entitled the noncircular thin section cyclic extrusion–compression (NCTS-CEC). In this technique, the whole length of the profile is passed through a neck zone while it is fully enclosed by the tools set. Therefore, the whole length of the specimen experiences a cyclic extrusion and compression, which accumulates a high level of strain in the material. The feasibility of the NCTS-CEC was successfully examined on aluminum profiles with L, U, and hollow square cross-sections. The microstructure evolution of the processed specimens was investigated by metallographic observations and X-ray diffraction analysis, which demonstrate the formation of a ultrafine-grained microstructure after processing by two cycles of the NCTS-CEC. Moreover, evaluations of the mechanical properties of the processed profiles show remarkable improvements in the yield and ultimate strengths. The microhardness of the processed specimens was also increased after the second cycle to ∼55 Hv from the initial value of 30 Hv. The deformation behavior of the material during processing by the NCTS-CEC method was also numerically simulated by the commercial finite element software DEFORM TM-3D V11.

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Section: Resultsmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Processing ultrafine grained non-circular cross-section profiles via severe plastic deformation

Babaei

Jafarzadeh

Mazloumbashiri

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…Figure 1(b) shows geometrical parameters of the TCEE process. The total plastic strain after application of N TCEE cycles ( ɛ tN ) is calculated by equation (1) 15 derived from the geometry of Figure 1 Equation (1) consists of two parts: the first part (Ln(AA0)=Ln(R2-r2R0 2-r0 2)) is related to the strain accumulation due to expansion (extrusion) during TCEE in which, as shown in Figure 1(b), R 0 is the outer radius of initial tube, r 0 is the inner radius of initial tube, R is the outer radius of tube in the expanded section, and r is inner radius of tube in the expanded section. The second part of equation (1), (43cot(φ2)), is related to the strain accumulation due to material deflection while material enters (exits) the expanded section as illustrated in Figure 1(b).…”

Section: Methodsmentioning

confidence: 99%

“…In this study, a recently developed SPD method 15 for tubular materials entitled tube cyclic expansion-extrusion (TCEE) was utilized for refining of aluminum tubes’ microstructure to the ultrafine grained (UFG) one. On the other hand, the deformation history of an RVE during TCEE was extracted from the conventional finite element simulation using a new approach.…”

Section: Introductionmentioning

confidence: 99%

Crystal plasticity modeling of grain refinement in aluminum tubes during tube cyclic expansion-extrusion

Babaei

Mashhadi

Sofiani

2016

Proceedings of the Institution of Mechanical Engineers, Part L:

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In the present study, a crystal plasticity finite element model was developed for simulating the microstructure evolution and grain refinement during tube cyclic expansion-extrusion as a severe plastic deformation method for tubular materials. A new approach was proposed for extracting the real deformation history of a representative volume element during severe plastic deformation methods. The deformation history of a representative volume element during four cycles of tube cyclic expansion-extrusion was extracted by the proposed approach. Then, in a crystal plasticity finite element model, the deformation history was applied to a two-dimensional polycrystalline representative volume element with randomly assigned crystalline orientations. The intergranular interactions between grains and the intragranular orientation gradients were successfully simulated by the crystal plasticity finite element model. The distribution of misorientation angles, the evolution of grain boundaries, and the achieved average grain size after different cycles of tube cyclic expansion-extrusion were investigated by the crystal plasticity finite element model. On the other hand, ultrafine grained aluminum tubes were processed by four cycles of tube cyclic expansion-extrusion and the grain size of the processed tubes was studied by scanning electron microscopy observations and X-ray diffraction analyses. The experimental and predicted (by crystal plasticity finite element model) average grain sizes were compared.

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“…Therefore, it is extremely essential to study the plastic extrusion die, especially the design of its transition section and forming section. The extrusion forming process of plastic profiles is a complex continuous nonlinear dynamic process involved thermodynamics, fluid mechanics, organic chemistry, mechanics and other disciplines, making the extrusion die design more difficult than other forming mold design [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Optimization Design of I-Type Plastic Extrusion Die Based on Flow Balance

Fang¹,

Cai²,

Wang³

et al. 2014

TOMEJ

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With the I-type plastic extrusion die for example, the advantages and disadvantages between the traditional design method and optimization design method were compared. The design was studied via finite element numeric analysis combined with optimization, whose objective was the equal average flow velocity of each sub-field of profile cross section at extrusion die. And the optimization design was studied by tacking the thickness of the entrance of transition section and the sectional dimension of forming section as the design variables. An example was provided to illustrate the optimization method proposed above. Results showed that the flow nonuniformity index could be reduced almost 9% and the mean flow velocity could be improved 28% by optimizing the design variables such as the thickness of the entrance of transition section and the sectional dimension of forming section.

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Tube cyclic expansion-extrusion (TCEE) as a novel severe plastic deformation method for cylindrical tubes

Cited by 34 publications

References 26 publications

Processing ultrafine grained non-circular cross-section profiles via severe plastic deformation

Processing ultrafine grained non-circular cross-section profiles via severe plastic deformation

Crystal plasticity modeling of grain refinement in aluminum tubes during tube cyclic expansion-extrusion

Optimization Design of I-Type Plastic Extrusion Die Based on Flow Balance

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