Asymmetric rolling process

Fajfar, Peter; Lah, Alenka Šalej; Kraner, Jakob; Kugler, G.

doi:10.1515/rmzmag-2017-0014

Cited by 14 publications

(6 citation statements)

References 29 publications

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“…They revealed that AR applied after CR reduces basal texture density and improves mechanical properties (Cho et al 2013). Also, a lower rolling force by almost half and lower torque is another advantage of AR compared to CR (Fajfar et al 2017;Kiefer and Kugi 2008;Liu and Kawalla 2012;Orlov et al 2013;Vincze et al 2020).…”

Section: The Principles Of Asymmetrical Rollingmentioning

confidence: 99%

“…According to their mathematical and computer modeling, the closer the shape factor, calculated by the ratio of contact arc length to average thickness in asymmetric rolling, is to 1.8, the straighter the material will come out. Material curvature in AR can also be eliminated by equipping the rolling mill with a table roller (Fajfar et al 2017;Kiefer and Kugi 2008). The difference in rolls' speeds and the percentage of thickness reduction affect the curvature tendency.…”

Section: The Principles Of Asymmetrical Rollingmentioning

confidence: 99%

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An Experimental Investigation into Roughness Transfer in Asymmetrical Rolling of Steel Strips

ÇOLAK,

AHMED,

ÖZAKIN

et al. 2023

Karadeniz Fen Bilimleri Dergisi

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This study investigated the effect of rolling parameters such as speed, thickness reduction, roll surface roughness, material thickness, surface condition (dry or lubricated), and rolling force on the roughening characterization in asymmetrical rolling. The surface roughness of the samples subjected to rolling tests was measured. The roughness values' average and standard deviation were found, and 3-D scanning images were acquired. Lubricated texturing experiments revealed that lubrication reduced roughness transfer. It was found that the introduction of roughness on the material surface decreased as the rolling speed increased. On the other hand, a higher speed increases the rolling force, which increases the surface roughness. The effect of speed on the standard deviation varies in direct proportion. Furthermore, lubricated rolling produced a more homogenous roughness distribution at higher speeds, while dry rolling produced homogeneous roughness at lower speeds. It was revealed that the rolling force is higher with thicker materials. While the roll roughness did not affect the rolling force using thicker material much, this effect was more pronounced in the very rough roll using thinner material. The standard deviation was lower in smaller reduction ratios using rough and very rough rolls. According to the results, although asymmetrical rolling has some advantages compared to conventional rolling, it was concluded that it is not a suitable method for roughening steel strips.

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Section: The Principles Of Asymmetrical Rollingmentioning

confidence: 99%

Section: The Principles Of Asymmetrical Rollingmentioning

confidence: 99%

An Experimental Investigation into Roughness Transfer in Asymmetrical Rolling of Steel Strips

ÇOLAK,

AHMED,

ÖZAKIN

et al. 2023

Karadeniz Fen Bilimleri Dergisi

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“…In addition, intentional and controlled asymmetry was introduced into the rolling process, the source of which can be a variation in the diameter or speed of the rolls, a variation in the value of the friction coefficients, as well as a change in the angle of feed [11][12][13][14]. Asymmetry in the rolling process introduces additional shear stresses into the material, which result in reduced forces during rolling, increased rolling reduction in one rolling pass, as well as the curvature of the strip in the longitudinal direction to the rolling direction [15][16][17][18][19][20][21]. During the conducted tests, asymmetry resulting from different rolling speeds and from the variation of the friction coefficients between the rolls was introduced.…”

Section: Introductionmentioning

confidence: 99%

The Estimation of the Stress State of the Iron Alloy Strip Material by the Barkhausen Noise Method

Krawczyk,

Sułek,

Kokosza

et al. 2024

Crystals

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This paper presents the effect of the complex strain state resulting from the asymmetric rolling of TRB products on the changes and distribution of the stress state in the material. The evaluation of the stress state in the material was based on measurements of the magnetoelastic parameter (MP) using the Barkhausen magnetic noise method. The key characteristics of the material under study that enabled the use of changes in the MP parameter to assess the stress state were ferromagnetism and a lack of texture. The first of these enabled the detection of the magnetic signals produced when a magnetic field is applied to the material, causing magnetic domains to align and sudden changes in magnetization. On the other hand, the absence of texture in the material precluded the occurrence of magnetocrystalline anisotropy, which could disturb the results of measurements of the magnetoelastic parameter in the material. In order to determine these features in the material under study, its chemical composition was determined, and a phase analysis was carried out using the X-ray diffraction method. The results of these tests showed the possibility of determining the stress state of the material by means of changes in the values of the MP parameter. On this basis, it was shown that in the TRB strips studied, there is a complex state of stress, the values of which and the nature of the changes depending on the direction of the measurements carried out, as well as on the amount of rolling reduction in the studied area of the strip.

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“…This type of extrusion belongs to the large group of SPD methods extensively described in the literature for the processing of various materials, but in contrast to previously described methods also enables the fabrication of rods with cross sections of various shapes and sizes. The SPD methods that are most frequently used and described in the literature are: equal channel angular extrusion [22][23][24], high-pressure torsion [25][26][27], accumulative roll bonding [28][29][30], repetitive corrugation and straightening [31][32][33], and asymmetric rolling [34][35][36]. The aim of all of them is the intense refining of the metal grain size in order to obtain superior mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Magnesium Powder Application on the Microstructure and Properties of Rods Extruded by the Forward-Backward Rotating Die Extrusion Method

et al. 2022

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The effects of severe plastic deformation (SPD) with a forward-backward rotating die (KOBO extrusion) on pure magnesium, in the form of cold-compacted powder, sintered powder, or cast ingots as reference, were examined. This method is known to reinforce metals, but the role of the initial form of magnesium applied in the fabrication of metal-based rods, as well as related phenomena, has not been characterized until now. The problem is important in the potential processing of commercial metal powders, the recycling of metal shavings, and the fabrication of metal matrix composites with discontinuous reinforcing phases. In the presented experiments, rods of 8 mm in diameter and 400 mm in length were obtained, and the structural effects induced by KOBO that occurred on a macro- and microscale on the surface and cross sections were characterized. Changes in the size and orientation of α-Mg crystallites were determined by XRD. The porosity, hardness, tensile strength, and compressive strength were measured, and the mechanisms of decohesion dependent on starting metal form were analyzed. After KOBO extrusion, significant differences were observed in the microstructure and properties between the materials derived from cold-compacted powder, sintered powder, and reference cast magnesium. Due to the application of KOBO, apart from α-Mg grain refinement, the MgO derived from the initial powder’s surface was refined to fine regular particles surrounded by magnesium. Their bands curved in the perpendicular plane and were oriented with the extrusion direction of the formed network, which augmented some mechanical properties and changed the decohesion mechanism. The conducted experiments revealed that before extrusion by KOBO, the magnesium powder required sintering under pressure.

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Asymmetric rolling process

Cited by 14 publications

References 29 publications

An Experimental Investigation into Roughness Transfer in Asymmetrical Rolling of Steel Strips

An Experimental Investigation into Roughness Transfer in Asymmetrical Rolling of Steel Strips

The Estimation of the Stress State of the Iron Alloy Strip Material by the Barkhausen Noise Method

Effect of Magnesium Powder Application on the Microstructure and Properties of Rods Extruded by the Forward-Backward Rotating Die Extrusion Method

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