Effects of Cross-Rolling on Deformation Texture Evolution in Unalloyed Titanium

2016 ◽  
Vol 879 ◽  
pp. 2014-2019
Author(s):  
Osamu Umezawa ◽  
Norimitsu Koga
Keyword(s):  
Rolling Mill ◽  
Transverse Direction ◽  
Texture Evolution ◽  
True Strain ◽  
Rolling Direction ◽  
Deformation Texture ◽  
Fiber Texture ◽  
Cross Rolling ◽  
Flat Rolling ◽  
The Cross

Unalloyed titanium was rolled with 20% reduction in each pass at 293 K using a cross rolling mill, where the upper and lower rolling axes were skewed each other at an angle of 0, 5 or 10 degree with parallel position. Multi-pass flat-rolling was carried out without any lubricants up to the true strain of 1, where two kinds of rolling directions such as tandem (uni-direction for all passes) and reverse (opposite direction in every passes) were adopted. The strain of specimens was increased proportionally as higher passes regardless of the rolling conditions. The transverse direction (TD) split deformation texture in titanium was generally developed under the cross angle of 0 degree. In the present strips of tandem, a main orientation was identified as (-12-18)[10-10]. In the case of tandem with the cross angle of 5 degree, a fiber texture was developed along (-12-18). That is the reason why a rotation in the rolling direction (RD) was overlapped. In the case of reverse with the cross angle of 5 degree, the main orientation was separated into [10-10] and [2-311] that were corresponded to TD and RD splits, respectively.

Effect of Strain Path on Texture Evolution in Cold Rolled Pure Titanium

2018 ◽  
Vol 921 ◽  
pp. 189-194
Author(s):  
Huan Ping Yang ◽  
Yao Mian Wang
Keyword(s):  
Cold Rolling ◽  
Strain Path ◽  
Texture Evolution ◽  
Pure Titanium ◽  
Rolling Texture ◽  
Deformation Texture ◽  
Fiber Texture ◽  
Prismatic Slip ◽  
Cross Rolling ◽  
Strain Paths

The cold rolling texture evolution as a function of strain path in pure titanium with initial typical recrystallized texture has been studied using viscoplastic self-consistent simulations. Three different strain paths, namely unidirectional rolling, two-step cross rolling and multi-step cross rolling have been employed to investigate the effect of strain path change on the evolution of deformation texture. The simulation results indicate that the activation of predominant prismatic slip in unidirectional rolling sample results in the formation of commonly cold rolling fiber texture RD//<10-10> in pure titanium, whereas the increased activity of basal slip over that of prismatic slip is responsible for the strong ND//<hkil> fiber texture in the two cross rolled samples.

scholarly journals On the Influence of Cross-Rolling on Shear Band Formation and Texture Evolution in Low Carbon Steel Sheets

1995 ◽  
Vol 24 (4) ◽  
pp. 225-237 ◽  
Author(s):  
M. Y. Huh ◽  
O. Engler ◽  
D. Raabe
Keyword(s):  
Texture Evolution ◽  
Shear Bands ◽  
Rolling Direction ◽  
Low Carbon Steel ◽  
Carbon Steels ◽  
Low Carbon ◽  
Band Formation ◽  
Cross Rolling ◽  
Rolled Specimen ◽  
The Cross

In order to understand the influence of the crystallographic texture and the dislocation structure on the deformation mechanism in low carbon steels, the development of the texture and the microstructure in cross-rolled specimens was investigated by employing X-ray texture measurements and TEM observations. The cross-rolled specimens were obtained by rotating the rolling direction by various angles up to 90° after 30% initial straight-rolling of the hot rolled band. Whereas only few shear bands were found in the straight-rolled specimen even after heavy deformation, in the cross-rolled specimen shear bands were often found at reductions in excess of 60%. This observation is discussed in terms of the rotation of the arrangement of dislocations and microbands during cross-rolling. The rolling textures observed in the various samples were interpreted by means of Taylor type deformation models.

Microstructure and Texture Evolution in Nickel during Accumulative Roll Bonding

2016 ◽  
Vol 879 ◽  
pp. 454-458 ◽  
Author(s):  
Jia Qi Duan ◽  
Md Zakaria Quadir ◽  
Michael Ferry
Keyword(s):  
Grain Boundaries ◽  
Accumulative Roll Bonding ◽  
Texture Evolution ◽  
Shear Bands ◽  
Rolling Direction ◽  
Sample Surface ◽  
Deformation Texture ◽  
Roll Bonding ◽  
Equiaxed Grains ◽  
Electron Back Scattered Diffraction

Microstructure and texture evolution of commercially pure Ni processed by accumulative roll-bonding (ARB) up to eight cycles were studied using electron back scattered diffraction (EBSD). During ARB processing, the original coarse equiaxed grains were gradually transformed into refined lamellar grains along the rolling direction (RD). Shear bands started forming after three cycles. The fraction of low angle grain boundaries (LAGBs) increased after the first and second cycle because of orientation spreading within the original grains. However, their fraction decreased with the evolution of high angle grain boundaries (HAGBs) during subsequent deformations, until saturation was reached after six cycles. Overall, the typical deformation texture components (S, Copper and Brass) were enhanced up to six ARB cycles and then only Copper was further strengthened. At higher cycles a higher Copper concentration was found near sample surface than the interiors due to a high frictional shear of ARB processing.

scholarly journals Deformation Texture Evolution in Flat Profile AlMgSi Extrusions: Experiments, FEM, and Crystal Plasticity Modeling

2021 ◽  
Vol 8 ◽  
Author(s):  
Tomas Manik ◽  
Knut Marthinsen ◽  
Kai Zhang ◽  
Arash Imani Aria ◽  
Bjørn Holmedal
Keyword(s):  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Crystal Plasticity ◽  
Texture Evolution ◽  
Rate Sensitivity ◽  
Deformation Texture ◽  
Fiber Texture ◽  
Electron Back Scatter Diffraction ◽  
Slip Systems ◽  
Flat Profile

In the present work, the deformation textures during flat profile extrusion from round billets of an AA6063 and an AA6082 aluminium alloy have been numerically modeled by coupling FEM flow simulations and crystal plasticity simulations and compared to experimentally measured textures obtained by electron back-scatter diffraction (EBSD). The AA6063 alloy was extruded at a relatively low temperature (350°C), while the AA6082 alloy, containing dispersoids that prevent recrystallization, was extruded at a higher temperature (500°C). Both alloys were water quenched at the exit of the die, to maintain the deformation texture after extrusion. In the center of the profiles, both alloys exhibit a conventional β-fiber texture and the Cube component, which was significantly stronger at the highest extrusion temperature. The classical full-constraint (FC)-Taylor and the Alamel grain cluster model were employed for the texture predictions. Both models were implemented using the regularized single crystal yield surface. This approach enables activation of any number and type of slip systems, as well as accounting for strain rate sensitivity, which are important at 350°C and 500°C. The strength of the nonoctahedral slips and the strain-rate sensitivity were varied by a global optimization algorithm. At 350°C, a good fit could be obtained both with the FC Taylor and the Alamel model, although the Alamel model clearly performs the best. However, even with rate sensitivity and nonoctahedral slip systems invoked, none of the models are capable of predicting the strong Cube component observed experimentally at 500°C.

scholarly journals Modification of Microstructure and Texture in Highly Non-Flammable Mg-Al-Zn-Y-Ca Alloy Sheets by Controlled Thermomechanical Processes

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 181 ◽  
Author(s):  
Sangbong Yi ◽  
José Victoria-Hernández ◽  
Young Kim ◽  
Dietmar Letzig ◽  
Bong You
Keyword(s):  
Mechanical Properties ◽  
Transverse Direction ◽  
Texture Evolution ◽  
Rolling Direction ◽  
Reduction Degree ◽  
Rolling Schedule ◽  
Texture Type ◽  
Basal Pole ◽  
Thermomechanical Processes ◽  
Basal Type

The influence of rolling temperature and pass reduction degree on microstructure and texture evolution was investigated using an AZXW3100 alloy, Mg-3Al-1Zn-0.5Ca-0.5Y, in wt.%. The change in the rolling schedule had a significant influence on the resulting texture and microstructure from the rolling and subsequent annealing. A relatively strong basal-type texture with a basal pole split into the rolling direction was formed by rolling at 450 °C with a decreasing scheme of the pass reduction degrees with a rolling step, while the tilted basal poles in the transverse direction were developed by using an increasing scheme of the pass reduction degrees. Rolling at 500 °C results in a further distinct texture type with a far more largely tilted basal pole into the rolling direction. The directional anisotropy of the mechanical properties in the annealed sheets was caused by the texture and microstructural features, which were in turn influenced by the rolling condition. The Erichsen index of the sheets varied in accordance to the texture sharpness, i.e., the weaker the texture the higher the formability. The sheet with a tetrarchy distribution of the basal poles into the transverse and rolling directions shows an excellent formability with an average Erichsen index of 8.1.

Effect of Initial Texture on the Deformed Microstructure of IF Steel

2007 ◽  
Vol 558-559 ◽  
pp. 1395-1400
Author(s):  
Jun Yun Kang ◽  
Brigitte Bacroix ◽  
Kyu Hwan Oh ◽  
Hu Chul Lee
Keyword(s):  
Texture Evolution ◽  
Rolling Texture ◽  
Small Strain ◽  
Deformation Texture ◽  
Fiber Texture ◽  
Orientation Dependence ◽  
If Steel ◽  
Misorientation Distribution ◽  
Steel Sheets ◽  
Initial Texture

The development of deformation texture and microstructure was examined for four different initial textures. IF steel sheets with a majority of α-, ε-, and γ-fiber and near random texture were prepared and cold rolled. The specimens exhibited characteristic behaviors in rolling texture evolution and deformation-induced misorientation development, according to their initial textures, especially at small strain levels. Due to the orientation dependence of intra-granular misorientation accumulation, the different texture evolutions affected the induced misorientation distribution. A larger fraction of γ-fiber orientations was related to more prominent misorientation development, while the initial texture stability simultaneously affected the misorientation development. The unstable, initial ε-fiber texture showed a stronger tendency of misorientation accumulation than the stable α-fiber during the subsequent cold rolling.

Synchrotron Radiation Investigation of Twinning in Extruded Magnesium Alloy AZ3l

2005 ◽  
Vol 495-497 ◽  
pp. 1633-1638 ◽  
Author(s):  
Chris H.J. Davies ◽  
Sang Bong Yi ◽  
Jan Bohlen ◽  
Karl Ulrich Kainer ◽  
Heinz Günter Brokmeier
Keyword(s):  
Magnesium Alloy ◽  
Synchrotron Radiation ◽  
Mechanical Behaviour ◽  
Elastic Strain ◽  
Transverse Direction ◽  
Texture Evolution ◽  
Deformation Texture ◽  
Normal Direction ◽  
Az31 Magnesium Alloy

The crystallographic response to deformation – texture evolution, internal elastic strain, and twin evolution – was measured for three load/orientation variants for AZ31 magnesium alloy extrudate tested in-situ in a synchrotron beamline. Specimens were loaded in tension parallel to the extrudate transverse direction, in compression along the same axis, and in compression parallel to the extrudate normal direction. The crystallographic responses are correlated with the mechanical behaviour of the extrudate.

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 Al-Li Alloy 2397-T87 Rolled Plate

2014 ◽  
Vol 788 ◽  
pp. 249-257
Author(s):  
Chun Ping Fan ◽  
Zi Qiao Zheng ◽  
Min Jia ◽  
Ji Fa Zhong ◽  
Bin Cheng
Keyword(s):  
Electron Microscopy ◽  
Fracture Toughness ◽  
Transverse Direction ◽  
Subsurface Layer ◽  
Rolling Direction ◽  
Cube Texture ◽  
Fiber Texture ◽  
Rolled Plate ◽  
Short Transverse ◽  
Short Transverse Direction

The microstructure, tensile property and fracture toughness of Al-Li alloy 2397-T87 rolled plate were investigated by optical microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, tensile and plane-strain fracture toughness tests. The results show that a pronounced texture variation through the plate thickness was found. Near the surface, Goss texture dominated. While in the center of the plate, typical β fiber texture and a scattering of cube texture were observed. And the subsurface layer exhibited a very weak texture. From the center to the subsurface, the fraction of β fiber texture and cube texture decreased. In contrast, the fraction of shear type texture reaching the maximum in subsurface layer increased. The tensile properties in different layers along the thickness direction were inhomogeneous. The strengths near the surface were lower than those in the center. And the through-thickness strength properties variation in the rolling direction was more remarkable than that in the long transverse direction. In the same thickness layer, the fracture toughness and the strengths were anisotropic. The strengths in the rolling direction were higher than those in the long transverse direction and the short transverse direction, and the strengths in the short transverse direction were the lowest. The fracture toughness in L-T orientation was the highest, followed by that in T-L orientation, and the fracture toughness in S-L orientation was the lowest.

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.

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