Texture Change of Severe Plastically Deformed Al Alloy Sheets

2010 ◽  
Vol 654-656 ◽  
pp. 1259-1262 ◽  
Author(s):  
In Soo Kim ◽  
Su Kwon Nam ◽  
Saidmurod Akramov
Keyword(s):  
Aluminum Alloy ◽  
Low Carbon Steel ◽  
Sheet Thickness ◽  
Deformation Texture ◽  
Alloy Sheet ◽  
Al Alloy ◽  
Low Carbon ◽  
Asymmetric Rolling ◽  
Heat Treated ◽  
Texture Change

Aluminum alloy sheets have lower formability (r-value) than low carbon steel sheets in fully annealed condition. Because the texture of fully annealed aluminum alloy sheet is mainly consists of cube component {001}<100>, which shows low formability. Asymmetric rolling, one of the severe plastic deformations, gives rise to shear deformation texture through the Al sheet thickness. In this paper, the changes of texture components after the severe deformation and subsequent heat treatment in Al sheet were observed. The change of the formability after the severe plastic deformation and subsequent heat-treated Al sheets have been analyzed with the change of texture of Al alloy sheets.

Asymmetric Rolling as Means of Texture and Ridging Control and Grain Refinement of Aluminum Alloy and Steel Sheets

2004 ◽  
Vol 449-452 ◽  
pp. 1-6 ◽  
Author(s):  
Dong Nyung Lee
Keyword(s):  
Aluminum Alloy ◽  
Shear Deformation ◽  
Grain Refinement ◽  
Sheet Thickness ◽  
Columnar Structure ◽  
Deformation Texture ◽  
Asymmetric Rolling ◽  
Steel Sheets ◽  
Shear Strains ◽  
The Ideal

Asymmetric rolling, in which the circumferential velocities of the upper and lower rolls are different, can give rise to intense plastic shear strains and in turn shear deformation textures through the sheet thickness. The ideal shear deformation texture of fcc metals can be approximated by the <111> // ND and {001}<110> orientations, among which the former improves the deep drawability. The ideal shear deformation texture for bcc metals can be approximated by the Goss {110}<001> and {112}<111> orientations, among which the former improves the magnetic permeability along the <100> directions and is the prime orientation in grain oriented silicon steels. The intense shear strains can result in the grain refinement and hence improve mechanical properties. Steel sheets, especially ferritic stainless steel sheets, and aluminum alloy sheets may exhibit an undesirable surface roughening known as ridging or roping, when elongated along RD and TD, respectively. The ridging or roping is caused by differently oriented colonies, which are resulted from the <100> oriented columnar structure in ingots or billets, especially for ferritic stainless steels, that is not easily destroyed by the conventional rolling. The breakdown of columnar structure and the grain refinement can be achieved by asymmetric rolling, resulting in a decrease in the ridging problem.

Increase of Lankford Value of Al-Mg-Si Sheets for Automotive Panel Produced by Asymmetric Warm Rolling

2007 ◽  
Vol 539-543 ◽  
pp. 333-338 ◽  
Author(s):  
Yoshiki Miki ◽  
Katsumi Koyama ◽  
O. Noguchi ◽  
Y. Ueno ◽  
Toshio Komatsubara
Keyword(s):  
Aluminum Alloy ◽  
Carbon Steel ◽  
Weight Reduction ◽  
Deep Drawing ◽  
Low Carbon Steel ◽  
Warm Rolling ◽  
Alloy Sheet ◽  
Low Carbon ◽  
Steel Sheets ◽  
R Value

To restrain global warming, weight reduction of autobodies is needed for fuel saving and discharge of carbon dioxide (CO2) gas. Usage of light weight aluminum alloy sheets is efficiency for the weight reduction, but the less formabilities comparing with low carbon steel sheets restrict the usage of autobodies applications actually. To improve the formabilities of aluminum alloy sheets, asymmetric warm rolling is studied. The formability of a metallic sheet strongly depends on the textures. Lankford value (r-value), one of the indicators of formability, of recrystallized low carbon steel sheets is high because the density of {111}//ND orientation suitable for deep drawing is high. The texture of conventionally cold rolled and recrystallized aluminum alloy sheets mainly consists of cube texture which is lower r-value and unsuitable for deep drawing. It is well known that similar texture to low carbon steel sheet can be obtained by shear deformation in aluminum alloy sheets. To provide the shear texture in aluminum alloy sheet, asymmetric warm rolling is carried out at 473K-573K with differential roll velocities. A small amount of {111}//ND orientation which is hardly produced by conventionally cold rolling is observed in asymmetric warm rolled aluminum alloy sheets after recrystallizing. Controlling the asymmetric warm rolling conditions, such as rolling temperature, total reduction and asymmetric ratio, higher r-value and deep drawability comparing with conventionally processed aluminum alloy sheets are achieved. Other properties such as strength, elongation, and bendability of asymmetric warm rolled sheets are almost same as those of conventionally processed sheets.

Plastic Strain Ratio of Warm and Hot Asymmetrically Rolled AA6061 Al Sheet

2017 ◽  
Vol 873 ◽  
pp. 60-64 ◽  
Author(s):  
In Soo Kim ◽  
Su Kwon Nam ◽  
Dong Nyung Lee
Keyword(s):  
Plastic Strain ◽  
Strain Ratio ◽  
Orientation Distribution ◽  
Alloy Sheet ◽  
Al Alloy ◽  
Asymmetric Rolling ◽  
Plastic Strain Ratio ◽  
X Ray ◽  
Heat Treated ◽  
Pole Figures

AA6061 Al alloy sheet was prepared by warm and hot asymmetric rolling at the temperature from 200 to 600°C. Pole figures of warm and hot asymmetric rolled AA6061 Al sheets were measured by X-ray diffractometer (XRD). Orientation distribution function (ODF) and the plastic strain ratio (R-value) were calculated. The calculated plastic strain ratio of starting sample was compared with those of different temperature warm and hot asymmetrically rolled samples. The plastic strain ratios of warm and hot asymmetrically rolled under different temperature and subsequently heat treated AA6061 Al sheets were shown higher than that of starting sample, but ΔRvalues expect 600°C were lower than that of starting sample.

WEIRKOTE PLUS

Alloy Digest ◽  
1987 ◽  
Vol 36 (6) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Carbon Steel ◽  
Physical Properties ◽  
Deep Drawing ◽  
Sheet Steel ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Steel Corp ◽  
Coated Sheet

Abstract WEIRKOTE PLUS is a Galfan-coated sheet steel. The sheet is conventional low-carbon steel normally used for galvanized sheets and strip. This digest will concentrate on the characteristics and properties of the Galfan coating which is nominally a 95% zinc-5% aluminum alloy. The coating on Weirkote Plus is ideal for a variety of tough applications. It is excellent for products that require deep drawing and it combines extra corrosion resistance with superior formability. This datasheet provides information on composition and physical properties. It also includes information on corrosion resistance as well as forming, joining, and surface treatment. Filing Code: Zn-41. Producer or source: Weirton Steel Corp.

Thermal Fatigue and Fracture Mechanics Analysis of Aluminium Alloy

2011 ◽  
Vol 201-203 ◽  
pp. 2476-2480
Author(s):  
Wen Xiao Zhang ◽  
Guo Dong Gao ◽  
Guang Yu Mu
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Fracture Mechanics ◽  
Thermal Fatigue ◽  
Low Carbon Steel ◽  
Strain Range ◽  
J Integral ◽  
Low Carbon ◽  
Thermal Fatigue Life ◽  
Energy Aspect

The in-phase and out-of-phase thermal fatigue of aluminum alloy were experimentally studied. The fatigue life was evaluated analytically by using the elastic-plastic fracture mechanics method (mainly J integral). The results of experiments and calculations showed that the life of out-of-phase fatigue was longer than that of in-phase fatigue within the same strain range. This is the same as the results of other materials such as medium and low carbon steel. On the other hand, the predicted life was consistent with experimental results. This suggests that J integral as a mechanics parameter for characterizing the thermal fatigue strength of aluminum alloy and the calculation method developed here is efficient. A parameter ΔW was proposed from energy aspect to characterize the capacity of crack propagation. The in-phase thermal fatigue life was the same as the out-of-phase thermal fatigue life for identical ΔW values.

Effect of Strain Path and the Magnitude of Prestrain on the Formability of a Low Carbon Steel: On the Textural and Microtextural Developments

2004 ◽  
Vol 126 (1) ◽  
pp. 53-61 ◽  
Author(s):  
S. K. Yerra ◽  
H. V. Vankudre ◽  
P. P. Date ◽  
I. Samajdar
Keyword(s):  
Carbon Steel ◽  
First Generation ◽  
Biaxial Tension ◽  
True Strain ◽  
Low Carbon Steel ◽  
Orientation Distribution ◽  
Deformation Texture ◽  
Low Carbon ◽  
Normal Anisotropy ◽  
Strain Paths

A low carbon steel (0.07-wt % carbon) sheet metal was deformed in five different strain paths, from equi-biaxial tension to plane strain to near uniaxial tension, by in-plane stretching. Textural developments were characterized by X-ray Orientation Distribution Function (ODFs) and the same were simulated using different Taylor type deformation texture models. A strong difference in bulk texture developments was observed at respective strain paths. The textural differences largely explain the changes observed in normal anisotropy values obtained by mechanical testing. The new deformation texture simulation model, Lamel, was quite successful in predicting quantitatively such textural differences. Microscopically, the significant features of the substructures were “strain localizations”—first generation dense dislocation walls (DDWs) and micro bands (MBs). Both in-grain rotations and estimated stored energies did depend on the relative appearance of such strain localizations. These, on the other hand, were distinctly related to the textural softening or dM/dε, where M and ε are the Taylor factor and true strain, respectively.

Texture Control in Steel and Aluminium Alloys by Rolling and Recrystallization in Non-Conventional Sheet Manufacturing

2012 ◽  
Vol 715-716 ◽  
pp. 89-95 ◽  
Author(s):  
Leo Kestens ◽  
Jurij J. Sidor ◽  
Roumen H. Petrov ◽  
Tuan Nguyen Minh
Keyword(s):  
Aluminium Alloys ◽  
Degrees Of Freedom ◽  
Recrystallization Texture ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Asymmetric Rolling ◽  
Recovery Processes ◽  
Annealing Texture ◽  
Annealing Conditions ◽  
Flat Rolling

The sheet manufacturing process, which involves various solid-state transformations such as phase transformations, plastic deformation and thermally activated recovery processes, determines the texture of steel and aluminium sheet. The conventional process of flat rolling and annealing only offers limited degrees of freedom to modify the texture of the final product. After annealing a {111} recrystallization fibre in BCC alloys and a cube dominated recrystallization texture in FCC metals is commonly obtained. Many applications, however, require other texture components than the ones achievable by conventional processing. In the present paper it is shown that by asymmetric rolling of a Si-alloyed ultra-low carbon steel a texture can be obtained with increased intensity on the {001} fibre, which is of interest for magnetic applications. Also in aluminium alloys the strong cube annealing texture can be drastically modified by the process of asymmetric rolling. It is argued that by observing the proper rolling and annealing conditions a recrystallization texture with improved normal and planar anisotropy of the mechanical properties may be produced.

Application of the friction surfacing process in a CNC machining center: a viability assessment for producing Al-alloy coatings on low carbon steel

2018 ◽  
Vol 40 (1) ◽  
Author(s):  
Márcio Maciel da Silva ◽  
Michel Lenhago Beneducci Afonso ◽  
Stephanny Lohanny Nunes Silva ◽  
Fernanda Christina Teotonio Dias Troysi ◽  
Ítalo Bruno dos Santos ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Cnc Machining ◽  
Al Alloy ◽  
Low Carbon ◽  
Viability Assessment ◽  
Friction Surfacing ◽  
Machining Center ◽  
Cnc Machining Center
Sign in / Sign up

Export Citation Format

Share Document