An Upper Bound Analysis of T-Shaped Equal Channel Angular Pressing

Wei, Kun; Liu, Ping; Ma, Zhijun; Wei, Wei; Alexandrov, Igor; Hu, Jing

doi:10.12776/ams.v21i1.539

Cited by 8 publications

(4 citation statements)

References 24 publications

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“… the angular speed of two working rolls are different; this can be achieved by different rolls diameters at the same speed rotations Under these conditions, the material is submitted to an extra shear deformation in addition to compression deformation. With increased shear deformation as well as the compression, it has been suggested that high angle boundaries develop with increasing strain, and ultrafine grains are formed by continuous recrystallization [13][14][15]. Deformation at cryogenic temperature has emerged as a potential route to develop ultrafine grained (UFG) material with improved mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Hight Purity Aluminium After Asymmetric Rolling at Ambient and Cryogenic Temperatures

Šimčák¹,

Kvačkaj²,

Kočiško³

et al. 2017

Acta Metall Slovaca

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<p class="AMSmaintitle"><span lang="EN-US">Ultrafine grained materials are capable of superplastic elongation at strain rates faster than those currently employed for commercial superplastic forming operations. However, such operations require the material in the form of thin sheets. Asymmetric rolling (ASR), as one of severe plastic deformation (SPD) methods, was used to make ultra-fined grain materials with enhanced performance. This work show effect of the deformation paths on micro-hardness and mechanical properties changing during asymmetric rolling of pure aluminium. In our case, the asymmetric condition was introduced by using different diameters with a ratio of upper and bottom roll 2,4. The thickness of samples was reduced about 20% - 40% at ambient temperature and at cryogenic temperature. Asymmetric rolling at cryogenic temperature (ASR-C) provides greater strength tensile properties than rolling at ambient temperature (ASR-A). </span></p>

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Section: Introductionmentioning

confidence: 99%

Evaluation of Hight Purity Aluminium After Asymmetric Rolling at Ambient and Cryogenic Temperatures

Šimčák¹,

Kvačkaj²,

Kočiško³

et al. 2017

Acta Metall Slovaca

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“…Diantaranya ada yang menggunakan SKD11, Orvar, dan HSS, selebihnya tidak disebutkan dalam jurnal penelitian yang mereka tulis. Kebanyakan penelitian itu lebih terfokus pada hasil perbaikan sifat mekanis material dibanding mengurai secara terperinci kondisi ECAP yang mereka lakukan (Furuno et al 2004;Komura et al 2001;Kuswarini 2012;Lee 2000;Wei et al 2015). Dengan informasi yang terbatas itu, menjadikan kesulitan bagi peneliti penerus yang hendak mengulang atau mengembangkan proses ECAP.…”

Section: Pendahuluanunclassified

“…Didapat bahwa beban kritis plunger hanya berada di 13.7 ton. Dari data ini jelas bahwa kekuatan plunger di bawah gaya upper bound, sehingga menyebabkan plunger gagal sebelum ECAP terlaksanakan (Wei et al 2015).…”

Section: Hasil Dan Pembahasanunclassified

Desain Ulang Plunger Pada Proses Equal Channel Angular Pressing Logam Jenis Magnesium

Suprianto¹,

Wijaya²

2021

Retims

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Penelitian ini membahas rekomendasi desain plunger untuk proses Equal Channel Angular Pressing (ECAP) logam jenis magnesium, sehingga dapat meminimalisir resiko kegagalan plunger saat proses berlangsung. Pada proses ECAP magnesium, plunger memiliki presentase kegagalan yang cukup tinggi. Pada percobaan ke-1 dengan sudut channel ECAP 900 dan material plunger EMS45, proses dihentikan pada kisaran beban 12-14 ton karena kegagalan plunger akibat tekukan. Pada percobaan ke-2, sudut channel diperbesar menjadi 1200, material plunger diganti dengan SKD11, dan panjang spesimen dirubah menjadi setengah dari percobaan ke-1. Prediksi Beban maksimum yang terjadi pada proses ECAP menggunakan persamaan upperbound ECAP dan dilanjutkan dengan analisa kolom untuk plunger yang hasil akhirnya akan dibandungkan. Dari perbandingan tersebut, diperoleh hasil yaitu pada percobaan ke-1 terbukti beban tekan ECAP yang dibutuhkan lebih tinggi dari ketahanan material plunger sehingga menyebabkan plunger gagal. Sedangkan pada percobaan ke-2 plunger dinyatakan aman dari kegagalan tekukan dengan safety factor 7,7.

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“…In the early 21st century, research observations were focused on bulk non-ferrous metals and their alloys with UFG structure [7][8][9][10][11][12][13]. The review paper [14] is mostly aimed at the analyze of UFG metals and alloys through the DSC method.…”

Section: Introductionmentioning

confidence: 99%

Material Recovery of OFHC Cu and FeSi Steel after Processing by Plastic Deformations

et al. 2017

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The influence of thermoplastic processes through severe plastic deformations carried out at ambient temperature and through rolling carried out at cryogenic temperature on the recovery for two types of materials was investigated. As experimental materials, there were used oxygen free high conductivity copper and FeSi steel presenting materials with middle and high stacking fault energy, respectively. Both materials have been previously investigated, however mainly considering their material properties. In this study, oxygen free high conductivity Cu was processed by 13 passes through equal channel angular rolling which belongs to the severe plastic deformations group of methods. The rolling of FeSi steel at ambient and cryogenic temperatures was performed using a laboratory duo rolling mill, samples were rolled only by one pass. The aim of this study was to insert the strain to the materials with different stacking fault energy (middle and high) under ambient and cryogenic thermal conditions, respectively, and subsequently to observe the influence of stored energy on structural recovery of materials through differential scanning calorimetry method. This study implies that the recovery process characterized by the mobility of structural defects begins earlier for FeSi steel compared to oxygen free high conductivity Cu.

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An Upper Bound Analysis of T-Shaped Equal Channel Angular Pressing

Cited by 8 publications

References 24 publications

Evaluation of Hight Purity Aluminium After Asymmetric Rolling at Ambient and Cryogenic Temperatures

Evaluation of Hight Purity Aluminium After Asymmetric Rolling at Ambient and Cryogenic Temperatures

Desain Ulang Plunger Pada Proses Equal Channel Angular Pressing Logam Jenis Magnesium

Material Recovery of OFHC Cu and FeSi Steel after Processing by Plastic Deformations

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