Interface sheet-constrained groove pressing as a modified severe plastic deformation process

Shahmirzaloo, A.; Faraji, Ghader; Safari, Mehdi; Mohammadinejad, S.

doi:10.1080/02670836.2018.1471379

Cited by 12 publications

(6 citation statements)

References 47 publications

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“…The variation of ultimate strength and grain size with increasing pass numbers of CSC and conventional CGP samples. 46,47 Figure 26. The schematic representation of the rubber pad CGP process and its processing step.…”

Section: Rubber Pad Cgpmentioning

confidence: 99%

“…The variation of ultimate strength and grain size with increasing pass numbers of CSC and conventional CGP samples. 46,47 …”

Section: Advanced Developing Processes Of Cgpmentioning

confidence: 99%

“…In mild steel, the grain size is reduced to 19 μm from 36 μm through CSC-CGP which is lower than that of 21 μm through conventional CGP. Figure 25 illustrates the variation of the ultimate tensile strength of aluminum 46 and the grain size of mild steel 47 with increasing CSC and conventional CGP pass numbers. Although the rate of grain refinement is initially higher through conventional CGP, the refined grain size is eventually higher compared to CSC-CGP.…”

Section: Advanced Developing Processes Of Cgpmentioning

confidence: 99%

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Developing methods of constrained groove pressing technique: A review

Kumar

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Among various severe plastic deformation (SPD) techniques, constrained groove pressing (CGP) has arisen as a famous technique for fabricating ultrafine-grained sheet metals and alloys in recent times. The severe strain is applied to improve the mechanical performance and properties. However, inhomogeneous grain refinement, lower formability, surface unevenness, and microcracks are the common limitations of conventional CGP-processed samples. Therefore, this review inspects the latest progress through modifications of the CGP process and compares the process efficacy with the conventional process. Advanced CGP processing techniques, such as modification of die design, annealing of the processed sample, cross CGP, ring CGP, hybrid SPD, covered sheet casing CGP, and rubber pad CGP, are emerging techniques to up-scale the procedure and improve the grain refinement and thereby produce superior mechanical properties. In this review paper, the historic research of conventional CGP and its effect on grain refinement and mechanical properties is initially briefed and then recent progress through different advanced techniques is highlighted, especially in alloys. Albeit significant progress has been observed in CGP, the future scope and successful usage of CGP-processed samples in actual practice are discussed in the last stage.

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Section: Rubber Pad Cgpmentioning

confidence: 99%

“…The variation of ultimate strength and grain size with increasing pass numbers of CSC and conventional CGP samples. 46,47 …”

Section: Advanced Developing Processes Of Cgpmentioning

confidence: 99%

Section: Advanced Developing Processes Of Cgpmentioning

confidence: 99%

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Developing methods of constrained groove pressing technique: A review

Kumar

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…Developing ultrafine-grained structures or nanostructured materials is one of the methods which enhance the mechanical properties of metals. 1 Ultrafine-grained (UFG) materials, due to special properties such as high values of hardness and strength, good formability, super-plasticity behavior at low-temperature, and increased fatigue resistance, have been subjected to great attention. 2 Among the various form of materials, sheet metals are one of the most highly consumed materials with plenty of applications in different industries such as automotive, transportation, and aerospace industries.…”

Section: Introductionmentioning

confidence: 99%

Effect of the uncertainty of multi-cut contour method and friction coefficient on residual stresses of constrained groove pressing process

Nazari

Honarpisheh

Zhao

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Constrained groove pressing (CGP) process is a severe plastic deformation (SPD) method that can create ultrafine-grained microstructure in the sheet metals. In this study, residual stresses of the CGP process and the effect of the friction coefficient on the residual stresses were investigated. The residual stresses were measured in two directions using a multi-cut contour method and a mathematical-finite element model was developed to estimate the uncertainty of results of the multi-cut contour method. In order to study the effect of the friction coefficient on the residual stresses, a 3D finite element model was employed and the results of it were validated with the experimental results of the CGP process. According to the results, residual stresses in the first pass of CGP are compressive on the surface and gradually change to tension at the center of the thickness. Investigation of the effect of the first cut on the residual stresses and uncertainty of the second cutting plane showed that the effect of the first cut is only confined to regions near the intersection of the two cuts. Distancing from the intersection of two cuts causes the effect of the first cut to be ineffective on the second cut. Also, evaluation of the effect of friction coefficient on the residual stress illustrated that friction has a direct relationship with the residual stresses.

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“…Şekil 1'de APD esnasında mikroyapıdaki değişimlerin şematik görüntüsü verilmiştir. APD teknikleri ile ultra ince taneli malzemeler elde edilebildiği için bu durum elde edilen malzemelerin çok düşük sıcaklıklarda yüksek deformasyon oranlarına sahip süper plastik bir davranış sergilemesine yol açmaktadır [3][4][5][6]. Aşırı plastik deformasyon işleminde temel amaç, çevreyle uyumlu yüksek mukavemetli ve hafif malzemeler üretmektir.…”

Section: Introductionunclassified

Boruların Çift Geçişli Paralel Tüp Kanal Açısal Presleme (DP- PTCAP) Yöntemi ile Aşırı Plastik Deformasyon Analizi

Taşdemir

2020

Fırat Üniversitesi Mühendislik Bilimleri Dergisi

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Öz: Aşırı plastik deformasyon (APD), nano yapılı ve ultra ince taneli malzemeler elde edilmesi amacı ile kullanılan bir yöntemdir. Tüp şeklindeki malzemelerin aşırı plastik deformasyonunda kullanılan birçok yöntem vardır. Bu yöntemlerden biri de paralel tüp kanal açısal presleme (PTCAP) yöntemidir. Bu çalışmada, boru şeklindeki parçaların deformasyonu çift geçişli paralel tüp kanal açısal presleme (DP-PTCAP) metodu kullanılarak araştırılmıştır. Analizlerde, 5 farklı kanal açısı, 4 farklı kesit genişleme oranı ve 4 farklı boyutsuz uzunluk kullanılmıştır. Bu parametrelerin elde edilen tüp (boru) şeklindeki parçaların gerilme, birim şekil değişimi ve şekillendirme kuvvetine etkileri sonlu elemanlar yöntemi ile analiz edilmiştir. Çalışmada AA6061 malzeme kullanılmıştır. Analizler sonucunda, kanal açısının artması ile efektif birim şekil değişimi, şekillendirme kuvveti ve malzemede oluşan gerilmenin azaldığı görülmüştür. Çift geçişli kalıplarla elde edilen malzemelerin birim şekil değişiminin tek geçişli kalıplara nazaran daha yüksek olduğu belirlenmiştir. Yapılan çalışma sonucu analizlerden elde edilen birim şekil değişimine bakarak çift geçişli kalıplar ile elde edilen malzemelerin tane yapısının tek geçişli kalıplara nazaran daha ince taneli olduğu söylenebilir.

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Interface sheet-constrained groove pressing as a modified severe plastic deformation process

Cited by 12 publications

References 47 publications

Developing methods of constrained groove pressing technique: A review

Developing methods of constrained groove pressing technique: A review

Effect of the uncertainty of multi-cut contour method and friction coefficient on residual stresses of constrained groove pressing process

Boruların Çift Geçişli Paralel Tüp Kanal Açısal Presleme (DP- PTCAP) Yöntemi ile Aşırı Plastik Deformasyon Analizi

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