Texture in Hot Extruded, Hot Rolled and Laser Welded Magnesium Base Alloys

2005 ◽  
Vol 105 ◽  
pp. 23-28 ◽  
Author(s):  
Robert A. Schwarzer
Keyword(s):  
Laser Welding ◽  
Grain Orientation ◽  
Sheet Material ◽  
Rolling Direction ◽  
Fiber Texture ◽  
Normal Direction ◽  
Rolled Sheet ◽  
Sheet Metals ◽  
Orientation Measurement ◽  
Hot Rolled

In this work the textures of MgAl9Zn1, MgAl6Zn1, MgAl3Zn1 and MgAl2Mn alloys have been studied, using individual grain orientation measurement (“ACOM”) in the SEM. Hot extruded billets, unidirectional, reverse and cross-rolled sheet metals as well as laser welding seams have been investigated. In the shaft of a partial extrudate through a circular die orifice, a <0001> ring fiber texture has formed which continuously changes into a spiral fiber texture in the bottom neck. The unidirectional and the reverse hot rolled MgAl2Mn specimens show an R type <0001> texture with a small asymmetrical split whereby the basal poles are tilted by about ±12° from the sheet normal direction to the rolling direction. In the hot cross rolled specimens, the basal poles are slightly spread both in the first and second rolling directions. Texture in the laser welding seams is weak and distinctly different from that of the sheet material. There is almost no heat affected zone at the margins of the welding seams.

scholarly journals Serrated Flow Behavior of Hot-Rolled Fe-6.5wt.%Si Sheet with Layered Structure

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1023
Author(s):  
Shi ◽  
Liang ◽  
Liu ◽  
Ding ◽  
Zhang ◽  
...  
Keyword(s):  
Tensile Deformation ◽  
Flow Behavior ◽  
Rolling Direction ◽  
Fiber Texture ◽  
Rolled Sheet ◽  
Ordered Structures ◽  
Serrated Flow ◽  
New Perspective ◽  
Hot Rolled ◽  
Equiaxed Grains

The microstructures and mechanical properties of the hot-rolled Fe-6.5wt.%Si sheet are analyzed. The microstructure of the hot-rolled sheet is layered along the thickness direction. The surface exhibits fine and equiaxed grains, whereas the center part shows coarse and elongated grains with a <101> fiber texture along the rolling direction. Serrated flow behavior is observed during tensile deformation of both the hot-rolled sheet and its center samples at 350 °C; thus, the serrated flow of the hot-rolled sheet is mainly attributed to the serration of the center part. The analyses of dislocation configurations, ordered structures, and crystal orientation show that the serrated flow behavior results from the interaction of solutes with mobile dislocations. Mobile dislocations are pinned by combining parallel forest dislocations with the pipe diffusion of solution atoms. This study provides a new perspective for the deformation mechanism of the Fe-6.5wt.%Si alloy.

The Influence of the Texture on the Creep behavior of γ-TiAl Sheet Material

2000 ◽  
Vol 646 ◽  
Author(s):  
Arno Bartels ◽  
Wolfram Schillinger ◽  
Anita Chatterjee ◽  
Helmut Clemens
Keyword(s):  
Creep Resistance ◽  
Transverse Direction ◽  
Sheet Material ◽  
Rolling Direction ◽  
Cube Texture ◽  
Lamellar Microstructure ◽  
Fiber Texture ◽  
Unit Cells ◽  
Fast Cooling ◽  
Hot Rolled

ABSTRACTIn hot rolled Ti-46.5at%Al-4at%(Cr,Nb,Ta,B) sheets a strong modified cube texture is found. The c-axes of the tetragonal unit cells in the grains are aligned with the transverse direction of the sheets. This texture causes an anisotropy of the creep resistance which is improved in transverse direction. Heat treatments with different subsequent cooling rates were performed in order to obtain lamellar microstructures with a different spacing of lamellae. Creep experiments exhibit an increase of the creep resistance which is highest after fast cooling. The texture measurements show no longer an alignment of c-axes after the heat treatment in the α-phase field, but a weak {110}-fiber texture in rolling direction occurs which causes a small improvement of the creep resistance in rolling direction. However, the creep resistance of the lamellar microstructure is more determined by the morphology than by the texture.

scholarly journals Serrated Flow Behavior of Hot-Rolled Fe-6.5wt.%Si Sheet with Layered Structure

2019 ◽  
Author(s):  
Xiangju Shi ◽  
Yongfeng Liang ◽  
Binbin Liu ◽  
Zhiyi Ding ◽  
Bao Zhang ◽  
...  
Keyword(s):  
Tensile Deformation ◽  
Flow Behavior ◽  
Rolling Direction ◽  
Fiber Texture ◽  
Rolled Sheet ◽  
Ordered Structures ◽  
Serrated Flow ◽  
New Perspective ◽  
Hot Rolled ◽  
Equiaxed Grains

The microstructures and mechanical properties of the hot-rolled Fe-6.5wt.%Si sheet are analyzed. The microstructure of the hot-rolled sheet is layered along the thickness direction. The surface exhibits fine and equiaxed grains, whereas the center part shows coarse and elongated grains with a &lt;101&gt; fiber texture along the rolling direction. Serrated flow behavior is observed during tensile deformation of both the hot-rolled sheet and its center samples at 350 &deg;C; thus, the serrated flow of the hot-rolled sheet is mainly attributed to the serration of the center part. The analyses of dislocation configurations, ordered structures, and crystal orientation show that the serrated flow behavior results from the interaction of solutes with mobile dislocations. Mobile dislocations are pinned by combining parallel forest dislocations with the pipe diffusion of solution atoms. This study provides a new perspective for the deformation mechanism of the Fe-6.5wt.%Si alloy.

Rolling Temperature and Subsequent Annealing on Microstructure, Texture and Mechanical Properties of Consecutive Rolled Mg-2.0Zn-0.8Gd Alloy

2013 ◽  
Vol 747-748 ◽  
pp. 369-376 ◽  
Author(s):  
Hong Yan ◽  
Rong Shi Chen ◽  
En Hou Han
Keyword(s):  
Mechanical Properties ◽  
Dynamic Recrystallization ◽  
Transverse Direction ◽  
Rolling Direction ◽  
Annealing Process ◽  
Normal Direction ◽  
Rolling Temperature ◽  
Rolled Sheet ◽  
Basal Texture ◽  
Different Temperatures

Mg-2.0Zn-0.8Gd (wt. %) alloy was rolled consecutively at different temperatures. The influence of rolling temperature and annealing process on the microstructure, texture and mechanical properties of the sheet were investigated. A deformation microstructure consisting of many intersected twins and a few dynamic recrystallization grains, and a basal texture with basal poles tilting about ± 10-15° from the normal direction towards the rolling direction were observed in the as-rolled sheet after 4 consecutive rolling processes. Static recrystallizaiton took place in the sheet after annealed above 300 °C. The annealed sheet exhibited a uniform microstructure and a non-basal texture with basal poles tilting about ± 38-43° from the normal direction towards the transverse direction. The annealed sheets exhibited higher ductility about 32% along the rolling direction and 40% along the transverse direction comparing with the as-rolled sheets. The static recrystallization during annealing process was helpful to modify the texture as well as the dynamic recrystallization during rolling in the RE-containing alloys.

Effects of Grain Boundaries in Columnar Grained Electrical Steels during Deformation and Recrystallization

2013 ◽  
Vol 753 ◽  
pp. 173-176
Author(s):  
Ping Yang ◽  
Yuan Yuan Shao ◽  
Ning Zhang ◽  
Ling Cheng ◽  
Wei Min Mao
Keyword(s):  
Grain Boundaries ◽  
Grain Orientation ◽  
Rolling Direction ◽  
Single Type ◽  
Electrical Steels ◽  
Grain Orientations ◽  
Columnar Grains ◽  
Cold Rolled ◽  
Ebsd Technique ◽  
Hot Rolled

The crystallographic and topographic anisotropies of columnar grains can exert strong influence on the subsequently hot rolled, cold rolled and annealed microstructures, textures and properties. The single type tilting grain boundaries among columnar grains will behave differently depending on grain orientations, rolling direction and stress state due to hot rolling and thus affect in return the microstructure and texture to some extents. This work aims to reveal the effects of grain boundaries and their neighboring grain orientation gradients in three types of Fe-3Si in differently processed samples using EBSD technique.

The Effect of Cold Rolling Direction on the Secondary Recrystallization in Fe-3%Si Steel

2011 ◽  
Vol 702-703 ◽  
pp. 591-594
Author(s):  
Kyung Jun Ko ◽  
Hyung Ki Park ◽  
Chan Hee Han
Keyword(s):  
Cold Rolling ◽  
Hot Rolling ◽  
Rotation Angle ◽  
Rolling Direction ◽  
Secondary Recrystallization ◽  
Rolled Sheet ◽  
Goss Texture ◽  
Cold Rolled ◽  
Hot Rolled ◽  
Similar Texture

In order to verify the origin of Goss nuclei for secondary recrystallization in Fe-3%Si steel, the effect of cold-rolling direction on the secondary recrystallization was examined in this study. The cold-rolling direction was rotated through 0 ~ 90 degrees about the hot-rolling direction on normal direction axis of hot-rolled sheet. In spite of the different initial texture before cold rolling, the 88% cold rolled texture was formed by similar α and γ fiber regardless of the rotation of cold rolling direction. Likewise, regardless of the cold rolling direction, the primary recrystallized sheets had a similar texture. In particular, the area fraction of Goss component (tolerance angle within 15º) in the primary recrystallized sheets was increased in the cold rolling condition of rotating through 60, 90 degrees from the hot rolling direction. After high temperature annealing at 1200°C, the secondary recrystallized grain was fully evolved in the all conditions. The sharpness of Goss texture in secondary recrystallized sheet was decreased as increasing the rotation angle of cold rolling direction.

scholarly journals The Development of Rolling Textures in Low-Carbon Steels

Texture ◽  
1972 ◽  
Vol 1 (2) ◽  
pp. 129-140 ◽  
Author(s):  
H. Inagaki ◽  
T. Suda
Keyword(s):  
Rolling Direction ◽  
Orientation Distribution ◽  
Fiber Texture ◽  
Carbon Steels ◽  
Normal Direction ◽  
Distribution Analysis ◽  
Low Carbon ◽  
Crystallite Orientation ◽  
Low Carbon Steels ◽  
Polycrystalline Iron

The crystallite orientation distribution analysis was applied to the study of the development of the rolling textures in low-carbon steels. It was found that the constraining effect of the grain boundary remarkably influences the rolling textures of polycrystalline iron. This enhances the crystal rotations, which would not be expected to occur in single crystals; and grains having the {110}〈112〉 orientations are forced to rotate about the 〈111〉axes lying in the sheet normal direction toward the {110}〈110〉 orientations. This is the origin of the 〈111〉 fiber texture normally found in the rolling textures of low-carbon steels. The presence of the partial fiber texture having the 〈111〉 axes inclined 30 deg from the sheet normal toward the rolling direction could not be confirmed.

The Application on Laser Welding in the Welding of Hot Rolled Sheet

2012 ◽  
Vol 189 ◽  
pp. 232-236
Author(s):  
Yang Yang ◽  
An Min Wang
Keyword(s):  
Laser Welding ◽  
High Strength Steel ◽  
Production Efficiency ◽  
High Strength ◽  
Experimental Results ◽  
Welding Parameters ◽  
Rolled Sheet ◽  
Welding Quality ◽  
Energy Save ◽  
Hot Rolled

Through a new laser welder welding parameters to optimize the welding of high strength steel, thereby contributing to acid-rolling unit efficient and reliable production and energy save. In order to ensure the welding quality, every few volumes, and will cut the crescent do cupping experimental results to determine whether you need to re-welding, to prevent acid rolled off with production efficiency.

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.

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