Texture Control of Aluminum and Magnesium Alloys by the Symmetric/Asymmetric Combination Rolling Process

2011 ◽  
Vol 702-703 ◽  
pp. 68-75 ◽  
Author(s):  
Hirofumi Inoue
Keyword(s):  
Rolling Direction ◽  
Solution Treatment ◽  
Rolling Process ◽  
Warm Rolling ◽  
Fiber Texture ◽  
Drawing Ratio ◽  
Asymmetric Rolling ◽  
Automotive Body ◽  
Solution Treated ◽  
Aluminum And Magnesium Alloys

In order to develop favorable textures for deep drawing of Al-Mg-Si and Mg-Al-Zn alloys that are promising as automotive body panels, we have adopted the symmetric/asymmetric combination rolling (SACR) process consisting of conventional symmetric rolling and subsequent asymmetric rolling at relatively low reduction. The combination of symmetric cold rolling and asymmetric warm rolling for AA6022 sheets leads to the formation of “TD-rotated β-fiber texture”, resulting in the evolution of {111} recrystallization texture after solution treatment at a high temperature. The SACR processed and solution-treated sheets show a high average r-value with small in-plane anisotropy, and consequently the limiting drawing ratio increases significantly, compared to that of the cold-rolled and solution-treated sheets. In the case of AZ31 magnesium alloy, the SACR process by hot rolling causes the formation of a unique texture, which shows two (0001) poles with tilt angles of 0 and −40 degrees from the normal direction (ND) toward the rolling direction (RD). In addition, subsequent annealing weakens intensity of the double-peak texture, so that the drawability is greatly improved in comparison with that of the conventional warm-rolled sheets with a strong basal texture. At the same time, yield strength decreases to some extent, but the SACR processed and annealed sheets exhibit a good balance of strength and formability due to a mixed texture with basal and tilt components.

{111} Recrystallization Texture Evolution in Al-Mg-Si Alloy Sheets Fabricated by Symmetric/Asymmetric Combined Rolling Process

2014 ◽  
Vol 783-786 ◽  
pp. 33-38 ◽  
Author(s):  
Hirofumi Inoue
Keyword(s):  
Recrystallization Texture ◽  
Texture Evolution ◽  
Solution Treatment ◽  
Rolling Process ◽  
Warm Rolling ◽  
Fiber Texture ◽  
Asymmetric Rolling ◽  
Automotive Body ◽  
High Fraction ◽  
High Reduction

A new rolling process, which combined asymmetric rolling with symmetric rolling, was adopted in age-hardenable 6xxx series Al-Mg-Si alloy promising as automotive body panels in order to develop favorable textures for the deep drawability after solution treatment. Symmetric cold rolling at high reduction and subsequent asymmetric warm rolling at low reduction for AA6022 sheets led to the formation of “TD-rotated β-fiber texture” including moderate {111}<uvw>-oriented components, resulting in noticeable evolution of {111}<110> recrystallization texture during the solution treatment at a high temperature. The results of texture analysis and microstructural observation suggested that the low stored energy after asymmetric warm rolling, the high fraction of high angle boundaries with neighboring deformed matrices and the approximate 40° <111> orientation relationship with deformed matrices would strongly affect the evolution of {111}<110> recrystallization texture.

Microstructure and Texture Dependence of Asymmetric Rolled AZ31 Mg Alloy

2007 ◽  
Vol 345-346 ◽  
pp. 77-80
Author(s):  
Jae Seol Lee ◽  
Hyeon Taek Son ◽  
Young Kyun Kim ◽  
Ki Yong Lee ◽  
Hyoung Mo Kim ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Transverse Direction ◽  
Rolling Direction ◽  
Rolling Process ◽  
Fiber Texture ◽  
The Other ◽  
Asymmetric Rolling ◽  
Rolled Sample ◽  
Deformation Twins ◽  
Az31 Mg Alloy

In this study, we try to investigate the asymmetric rolling process affects microstructure, texture and formability of AZ31 Mg sheet. The deformation twins are clearly apparent, small and recrystallized grains are visible along some grain boundary and twinned regions in the as-rolled both samples. The symmetrically rolled sample tended to show peak inclined to the rolling direction. On the other hand, the asymmetrically rolled sample tended to show peak slightly inclined to the transverse direction. From the pole figure observation by EBSD, the intensity decrease of basal fiber texture after asymmetric rolling should be attributed to the severe shear strain induced during asymmetric process. The Erichsen value was measured to be 6.5 for asymmetrically rolled sample and 5.2 for symmetrically rolled sample.

Recrystallization Textures of Al-Mg-Si Alloy Sheets Produced by Symmetric and Asymmetric Combination Rolling

2007 ◽  
Vol 558-559 ◽  
pp. 207-212 ◽  
Author(s):  
Hirofumi Inoue ◽  
M. Hori ◽  
Toshio Komatsubara ◽  
Hiroki Tanaka ◽  
Takayuki Takasugi
Keyword(s):  
Low Temperature ◽  
Recrystallization Texture ◽  
Solution Treatment ◽  
Rolling Texture ◽  
Warm Rolling ◽  
Fiber Texture ◽  
Speed Ratio ◽  
Asymmetric Rolling ◽  
Low Temperature Annealing ◽  
R Value

In order to improve deep drawability of 6000 series aluminum alloys for automotive body panels, texture control for increasing r-value of the sheets was attempted by combination of symmetric and asymmetric rolling. Asymmetric warm rolling at relatively low reduction after symmetric rolling made it possible to form TD-rotated β-fiber texture including {111} components. Recrystallization textures of the T4-treated materials varied significantly depending on roll speed ratio and reduction in asymmetric warm rolling. On appropriate rolling conditions, {111}<110> orientation with high r-value was formed as a main component of recrystallization texture. On the other hand, two-stage heat treatment consisting of low temperature annealing and subsequent T4-treatment led to a significant change in recrystallization texture. In the sample annealed for long time at a low temperature, TD-rotated β-fiber rolling texture was retained even after solution treatment at a much higher temperature, because recovery or recrystallization took place to some extent during low temperature annealing.

Study on the Microstructure and Texture of Warm Rolled ZK60 Magnesium Alloy Sheet

2012 ◽  
Vol 557-559 ◽  
pp. 1344-1348
Author(s):  
Hong Mei Chen ◽  
Hua Shun Yu ◽  
Guang Hui Min ◽  
Yun Xue Jin
Keyword(s):  
Shear Bands ◽  
Rolling Direction ◽  
Rolling Process ◽  
Warm Rolling ◽  
Alloy Sheet ◽  
Rolling Temperature ◽  
Rolling Reduction ◽  
Basal Pole ◽  
Zk60 Alloy ◽  
Twin Roll

The microstructure and macrotexture of ZK60 alloy sheet were investigated through OM and XRD, which were produced by twin roll casting and sequential warm rolling. Microstructure of twin roll cast ZK60 alloy changed from dendrite structure to fibrous structure with elongated grains and high density shear bands along the rolling direction after warm rolling process at different rolling parameters. The density of shear bands increased with the decreasing of the rolling temperature, or the increasing of per pass rolling reduction. Dynamic recrystallization could be found during the warm rolling process at and above 350oC, and many fine grains could be found in the shear band area. The warm rolled ZK60 alloy sheet exhibited strong (0001) basal pole texture. The formation of the shear bands tends to cause the basal pole tilt slightly to the transverse direction after warm rolling. The intensity of (0001) pole figure increased with the decreasing of rolling temperature, or the increasing of per pass rolling reduction.

Texture Evolution during Asymmetrical Warm Rolling and Subsequent Annealing of Electrical Steel

2011 ◽  
Vol 702-703 ◽  
pp. 758-761 ◽  
Author(s):  
Tuan Nguyen Minh ◽  
Jurij J. Sidor ◽  
Roumen H. Petrov ◽  
Leo Kestens
Keyword(s):  
Electrical Steel ◽  
Texture Evolution ◽  
Core Loss ◽  
Rolling Process ◽  
Warm Rolling ◽  
Deformation Texture ◽  
Asymmetric Rolling ◽  
Electrical Steels ◽  
Annealing Texture ◽  
Crystal Orientations

The core loss and magnetic induction of electrical steels are dependent on the microstructure and texture of the material, which are produced by the thermo-mechanical processing. After a conventional rolling process, crystal orientations of the α-(//RD) and γ-(//ND) fibers are strongly present in the final texture. These fibers have a drastically negative effect on the magnetic properties of electrical steels. By applying asymmetric rolling, significant shear strains could be introduced across the thickness of the sheet and thus a deformation texture with more magnetically favorable components is expected. In this study, an electrical steel of 1.23 wt.% Si was subjected to asymmetric warm rolling in a rolling mill with different roll diameters. The evolutions of both deformed and annealed textures were investigated. The texture evolution during asymmetric warm rolling was analyzed by crystal plasticity simulations using the ALAMEL model. A good fit between measured and calculated textures was obtained. The annealing texture could be understood in terms of an oriented nucleation model that selects crystal orientations with a lower than average stored energy of plastic deformation.

Experimental Study on the Twin Roll Strip Casting and Warm Rolling Fe-6.5 wt. %Si Steel Sheet

2013 ◽  
Vol 873 ◽  
pp. 48-53 ◽  
Author(s):  
Feng Quan Zhang ◽  
Zhen Yu Liu ◽  
Zhong Han Luo ◽  
Guang Ming Cao
Keyword(s):  
Magnetic Properties ◽  
Steel Sheet ◽  
Texture Evolution ◽  
Magnetic Measurement ◽  
Research Work ◽  
Rolling Direction ◽  
Warm Rolling ◽  
Fiber Texture ◽  
Strip Casting ◽  
Twin Roll

An Fe-6.5 wt. % Si steel sheet with a final thickness of 0.30 mm was produced by twin roll strip casting and warm rolling process. The effects of casting, warm rolling and annealing process on microstructure, texture and magnetic properties were investigated with optical microscopy, X-ray diffraction and magnetic measurement. The microstructure evolution during preparation was shown as follows: columnar grain and a small amount of fine grain in center (as casted) elongated grains and a small amount of the shear bands along the rolling direction (as rolled) a relatively uniform recrystallized microstructure (as annealed). The texture evolution during preparation was shown as follows: {001} λ fiber texture (as casted) the significant α fiber texture and the weak, inhomogenous γ fiber texture (as warm rolled) the strong {001} λ fiber texture and weak, inhomogenous γ fiber texture (as annealed). The excellent soft magnetic properties were obtained with a very small P1.0/400of 10.751 W/kg and a very high B50up to 1.438 T at optimum annealing condition (1150 °C for 1 h). The research work was useful to develop electrical steel by twin roll continuous casting process.

Microstructure and Mechanical Properties of Multi-Pass Warm Rolled Ti-6Al-4V Alloy of Different Microstructures

2016 ◽  
Vol 716 ◽  
pp. 871-876
Author(s):  
Yong Xu ◽  
Xiang Jie Yang ◽  
Dan Ni Du
Keyword(s):  
Mechanical Properties ◽  
Rolling Direction ◽  
Rolling Process ◽  
Warm Rolling ◽  
Strengthening Effect ◽  
Test Results ◽  
Microstructure And Mechanical Properties ◽  
Rolled Specimen ◽  
The Difference ◽  
Conventional Rolling

In this investigation three kinds of raw microstructure Ti-6Al-4V alloys were studied using two directional rolling on a conventional rolling mill. The effect of deformation on microstructure and mechanical properties has been attempted. Microstructural observation indicated that the size of the lamellar/equiaxed α grain was sharply decreased to submicro after multi-pass warm rolling. Tensile test results showed that the multi-pass warm rolling process was found to have a remarkable strengthening effect. The ultimate tensile strength and yield stress were increased by more than 10% and 25% respectively compared with unidirection rolled specimen, and the elongation has been increased by more than one times, and the maximum is up to 1.58 times. Meanwhile, the difference of the strength and elongation between in rolling direction and in transverse direction has been greatly reduced.

Effect of Solution Treatment on Microstructures and Hardness of Mg-Gd-Y-Zr Alloy

2014 ◽  
Vol 937 ◽  
pp. 182-186
Author(s):  
Quan An Li ◽  
Lei Lei Chen ◽  
Wen Chuang Liu ◽  
Xing Yuan Zhang ◽  
Hui Zhen Jiang
Keyword(s):  
Vickers Hardness ◽  
Cast Alloy ◽  
Solution Treatment ◽  
Hardness Measurement ◽  
Solution Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solution Treated ◽  
Primary Particles ◽  
Zr Alloy

The influence of the solution treatment (at the temperature of 500-520°C for 4-12 h) on microstructures and mechanical properties of Mg-Gd-Y-Zr alloy was investigated by means of optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) and Vickers hardness measurement. The as-cast alloy contains a microstructure consisting of α-Mg matrix, Mg5Gd phase and Mg24Y5phase. With increasing solution temperature and time, the quantity of the primary particles (Mg5Gd and Mg24Y5) in the alloy continually decreased, and the degree of recrystallization gradually increased, which result in the gradual decrease of the Vickers hardness of the solution-treated alloys.

scholarly journals The Influence of the Asymmetric Arb Process on the Properties of Al-Mg-Al Multi-Layer Sheets / Wpływ Asymetrii W Procesie Arb Na Właściwości Wielowarstwowych Blach Al-Mg-Al

2015 ◽  
Vol 60 (4) ◽  
pp. 2821-2826 ◽  
Author(s):  
A. Wierzba ◽  
S. Mróz ◽  
P. Szota ◽  
A. Stefanik ◽  
R. Mola
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Tensile Strength ◽  
Rolling Process ◽  
Asymmetry Factor ◽  
Relative Reduction ◽  
Test Results ◽  
Initial Thickness ◽  
Asymmetric Rolling ◽  
Aluminium Layer

The paper presents the results of the experimental study of the three-layer Al-Mg-Al sheets rolling process by the ARB method. The tests carried out were limited to single-pass symmetric and asymmetric rolling processes. An Al-Mg-Al package with an initial thickness of 4 mm (1-2-1 mm) was subjected to the process of rolling with a relative reduction of 50%. To activate the shear band in the strip being deformed, an asymmetry factor of av=2 was applied. From the test results, an increase in the tensile strength of the multi-layer Al-Mg-Al sheets obtained from the asymmetric process was observed. Microhardness tests did not show any significant differences in aluminium layer between respective layers of sheets obtained from the symmetric and the asymmetric process. By contrast, for the magnesium layer, an increase in microhardness from 72 HV to 79 HV could be observed for the asymmetric rolling. The analysis of the produced Al-Mg-Al sheets shows that the good bond between individual layers and grain refinement in the magnesium layer contributed to the obtaining of higher mechanical properties in the multi-layer sheets produced in the asymmetric process compared to the sheets obtained from the symmetric process.

Sign in / Sign up

Export Citation Format

Share Document