Through-Thickness Shear Strain in Silicon Steel under Asymmetric Rolling

2011 ◽  
Vol 702-703 ◽  
pp. 762-765
Author(s):  
H.P. Yang ◽  
Yu Hui Sha ◽  
Fang Zhang ◽  
Wei Pei ◽  
Liang Zuo
Keyword(s):  
Shear Strain ◽  
Strain Distribution ◽  
Sheet Thickness ◽  
Silicon Steel ◽  
Strain Variation ◽  
Asymmetric Rolling ◽  
Roll Pressure ◽  
Cold Rolled ◽  
Thickness Shear ◽  
Differential Speed

Through-thickness shear strain variation with speed/radius/friction ratio in cold rolled silicon steel under different asymmetric rolling modes was analyzed by finite element method (FEM). Cold rolling textures were also investigated quantitatively to correlate with the calculated shear strain. With increasing speed/radius/friction ratio, shear strain distribution under differential-speed and differential-radius rolling exhibits similar characteristic in contrast to differential-friction rolling. Unidirectional shear strain develops through sheet thickness when asymmetric speed and radius ratio exceeds 1.125, whereas it does not appear even at friction ratio of 1.5. Shear strain distribution dependent on asymmetric rolling modes can be well understood by forward and backward slip zones as well as roll pressure as a function of speed/radius/friction ratio.

Through-Thickness Texture Variation in Non-Oriented Electrical Steel Sheet Produced by Asymmetric Rolling

2009 ◽  
Vol 79-82 ◽  
pp. 1947-1950
Author(s):  
Wei Pei ◽  
Y.H. Sha ◽  
H.P. Yang ◽  
F. Zhang ◽  
Liang Zuo
Keyword(s):  
Cold Rolling ◽  
Strain Distribution ◽  
Electrical Steel ◽  
Sheet Thickness ◽  
Speed Ratio ◽  
Asymmetric Rolling ◽  
Surface Layers ◽  
Cold Rolled ◽  
Rolling Mode ◽  
Electrical Steel Sheet

The hot bands of non-oriented electrical steel were cold rolled by asymmetric rolling with speed ratio of 1.125 as well as conventional symmetric cold rolling to investigate the effects of cold rolling mode on through-thickness texture variation. Asymmetric rolling shows a marked weakening effect on α fiber (RD//<110>) running from {001}<110> to {112}<110> through sheet thickness, especially at the side contacting with faster roll. Asymmetric rolling increases {111}<112> component while decreases {111}<110> component through sheet thickness except for the surface layers. The through-thickness texture variation due to asymmetric rolling was explained in terms of shear strain distribution.

Experimental and Numerical Investigations of the Plastic Deformation during Multi-Pass Asymmetric and Symmetric Rolling of High-Strength Aluminum Alloys

2014 ◽  
Vol 794-796 ◽  
pp. 1157-1162 ◽  
Author(s):  
Cun Qiang Ma ◽  
Long Gang Hou ◽  
Ji Shan Zhang ◽  
Lin Zhong Zhuang
Keyword(s):  
Plastic Deformation ◽  
Shear Strain ◽  
Strain Distribution ◽  
Effective Strain ◽  
High Strength ◽  
Equivalent Strain ◽  
Asymmetric Rolling ◽  
Element Simulation ◽  
Before And After ◽  
High Strength Aluminum Alloys

For understanding the distribution of plastic deformation induced by asymmetric rolling (ASR), multi-pass ASR and symmetric rolling (SR) experiments combined with the finite element simulation were used for high-strength aluminum alloy in the present study. The influence of reduction per-pass on the shear / effective strain distributions were studied via different ASR processes. By measuring the shear angle (θ, the angle between the reference mark before and after rolling) of rolled sheets, redundant shear strain and equivalent strain were calculated. It is shown that with equal total thickness reduction for ASR and SR, ASR can induce much more shear deformation through the thickness. By calculating the evolution of redundant shear strain and total equivalent strain for different ASR routines, it indicates that small pass reduction could be much favorable to the strain accumulation than that of the large pass reduction under a same total reduction in ASR process. Also, the influence of shear stress on the strain distribution and the through-thickness strain distribution were studied and evaluated with FEM analyses.

Texture Evolution and Grain Refinement in AA1050 Aluminum Alloy Sheets Asymmetrically Rolled with Varied Shear Directions

2007 ◽  
Vol 340-341 ◽  
pp. 619-626 ◽  
Author(s):  
J.K. Lee ◽  
Dong Nyung Lee
Keyword(s):  
Shear Strain ◽  
Grain Refinement ◽  
Texture Evolution ◽  
Sheet Thickness ◽  
Al Alloy ◽  
Asymmetric Rolling ◽  
Electron Backscattered Diffraction ◽  
Rotation Rates ◽  
Aluminum Sheets ◽  
Deformation Textures

Asymmetric rolling is a novel technique for giving rise to an intense plastic shear strain through the sheet thickness. The shear strain also develops shear deformation textures close to the {001}<110> and <111>//ND orientations, among which the latter is the most wanted component for the deep drawability, and give rise to the grain refinement. Previously we analyzed various rolling variables influencing the texture development and grain refinement in aluminum sheets obtained by asymmetric rolling with different roll-radius ratios at the same rotation rate and varied reduction per pass. In this study, AA1050 Al alloy sheets were asymmetrically rolled with a two-high mill of which two rolls had the same diameter, but rotated at different rotation rates, with emphasis on effects of combinations of shear directions in several passes. Textures and microstructures of the rolled sheets were investigated by x-ray diffraction and electron backscattered diffraction analyses.

Influence of Process Parameters on Distribution of Shear Strain through Sheet Thickness in Asymmetric Rolling

2014 ◽  
Vol 622-623 ◽  
pp. 929-935 ◽  
Author(s):  
Alexander Pesin ◽  
D.O. Pustovoytov
Keyword(s):  
Shear Strain ◽  
Process Parameters ◽  
Sheet Thickness ◽  
Grain Structure ◽  
Ultrafine Grain ◽  
Shear Strain Rate ◽  
Asymmetric Rolling ◽  
Influence Of Process Parameters ◽  
Ultrafine Grain Structure ◽  
Velocity Mismatch

Materials with ultrafine grain structure and unique physical and mechanical properties can be obtained by methods of severe plastic deformation, which include asymmetric rolling processes. Asymmetric rolling is a very effective way to create ultrafine grain structures in metals and alloys. Since the asymmetric rolling is a continuous process, it has great potential for industrial production of ultrafine grain structure sheets. Basic principles of asymmetric rolling are described in detail in scientific literature. Focus in the well-known works is on the possibility to control the structure of metal sheets. However the systematic data on the influence of the process parameters (e.g., ratio of rolls velocity mismatch, reduction per pass, friction and diameter of rolls), and the shear strain rate required to achieve a significant grain refinement in asymmetric rolling are lacking. The influence of ratio of rolls velocity mismatch, reduction per pass, friction and the rolls diameter on the distribution of shear strain through the sheet thickness in asymmetric rolling has been studied in DEFORM 2D. The results of the study will be useful for the research of evolution of ultrafine grain structure in asymmetric rolling.

Controlling the Thickness Uniformity in Equal Channel Angular Rolling (ECAR)

2007 ◽  
Vol 539-543 ◽  
pp. 2872-2877 ◽  
Author(s):  
Young Hoon Chung ◽  
Jong Woo Park ◽  
Kyong Hwan Lee
Keyword(s):  
Shear Strain ◽  
Shear Deformation ◽  
Control Mechanism ◽  
Sheet Thickness ◽  
Surface Friction ◽  
Metal Sheet ◽  
Thickness Variation ◽  
Thickness Control ◽  
Thickness Uniformity ◽  
Elastic Unit

As the surface friction between feeding rolls and metal sheet generates the feeding power of ECAR, the generated feeding power is low, and the friction between the metal sheet and ECAR die should be minimized. However, for obtaining a large shear deformation by ECAR, the metal sheet should be tightly contacted with the wall of ECAR die. In this condition, the thickness of the metal sheet is continuously increased during ECAR. A new ECAR apparatus is developed for maximizing the shear deformation and obtaining sheet thickness uniformity, and succeeding continuous ECAR with such a limited feeding power. By controlling the outlet gap of the ECAR die with elastic unit, the thickness of the metal sheet is kept uniform. Detailed thickness control mechanism during the new ECAR process is analyzed. A sheet of Al 6063 alloy that is 1-pass deformed with the new ECAR apparatus shows below ±0.037 mm of thickness variation and 0.61 of shear strain.

Analysis of the Strain Distribution and Texture Measurements in Asymmetric Rolling (AR) and Asymmetric Accumulative Roll Bonding (AARB)

2021 ◽  
Vol 1016 ◽  
pp. 715-724
Author(s):  
Renan P. Godoi ◽  
Bianca D. Zanquetta ◽  
José Benaque Rubert ◽  
Raul E. Bolmaro ◽  
Martina C. Avalos ◽  
...  
Keyword(s):  
Accumulative Roll Bonding ◽  
Sheet Thickness ◽  
Thickness Reduction ◽  
Thickness Variation ◽  
Asymmetric Rolling ◽  
Roll Bonding ◽  
Bonding Condition ◽  
Shear Component ◽  
Strong Shear ◽  
Metallic Composites

Severe plastic deformation (SPD) with strong shear component is required to promote both grain refinement and texture randomization. When Asymmetric rolling (AR) is applied as asymmetric accumulative roll bonding (AARB), it enables the production of architectured microstructures and metallic composites. Finite element (FE) simulations of AR and AARB were employed to understand the influence of pass thickness reduction (PTR) on the through thickness variation of the velocity gradient. The influence of the PTR up to a total thickness reduction of 50% and the effect of a single 50% reduction step in a bi-layer bonding condition was analyzed. The influence of these process parameters on the strain and rigid body rotation components was compared with the experimental data obtained on an AA1050 aluminum. A better shear to compression ratio across the sheet thickness is achieved by PTRs lower than 30%; at a PTR of 50% the texture is dominated by the frictional shear generated at the roll-sheet interface and the process has a stronger compressive character. This indicates that simple ARB followed by AR with smaller PTRs should generate a better shear distribution than AARB alone.

Technology Development of Large-Size Bodies Manufacturing from Thick Plate Materials Based on Combined Methods of Deformation

2016 ◽  
Vol 685 ◽  
pp. 375-379 ◽  
Author(s):  
Alexander Pesin ◽  
Ernst Drigun ◽  
D.O. Pustovoytov ◽  
Ilya Pesin
Keyword(s):  
Thick Plate ◽  
Technology Development ◽  
Sheet Thickness ◽  
Technological Parameters ◽  
Asymmetric Rolling ◽  
Plastic Bending ◽  
Second Stage ◽  
Large Size ◽  
Third Stage ◽  
Three Stages

The main goal of the investigation is to determine key technological parameters, necessary for producing required curvature of sheets up to 4000 mm in width with the required mechanical properties. Investigation into dynamics of the process' main technological parameters allowed it to define its three characteristic stages: asymmetric rolling, asymmetric rolling in combination with initial unsettled plastic bending, and asymmetric rolling combined with settled plastic bending. It was found out that the intensity of the deformations changes unevenly, depending on the height of the deformation zone, on all three stages, with its highest value being in the lower part of the sheet, and with the lowest value being in its center. In the second stage, the intensity of the deformation abruptly increases, and a significant asymmetry on the sheet thickness occurs. In the third stage, the non-uniformity of the intensity deformations fields decreases. Similar results can be also observed for stress intensities. Casings on two converters were produced and installed in the oxygen-converter plant.

Structure and Mechanical Properties of Asymmetrically Rolled IF Steel Sheet

2010 ◽  
Vol 654-656 ◽  
pp. 1255-1258 ◽  
Author(s):  
Dmitry Orlov ◽  
Rimma Lapovok ◽  
László S. Tóth ◽  
Ilana B. Timokhina ◽  
Peter D. Hodgson ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Steel Sheet ◽  
Rolling Direction ◽  
If Steel ◽  
Asymmetric Rolling ◽  
Cold Rolled ◽  
Hot Rolled ◽  
If Steel Sheet

As-received hot-rolled 5.6 mm thick IF steel sheet was symmetrically/asymmetrically cold rolled at room temperature down to 1.9 mm. The asymmetric rolling was carried out in monotonic (an idle roll is always on the same side of the sheet) and reversal (the sheet was turned 180º around the rolling direction between passes) modes. Microstructure, texture and mechanical properties were analysed. The observed differences in structure and mechanical properties were modest, and therefore further investigation of the effects of other kinds of asymmetry is suggested.

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