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 Effect of Shear Deformation on Texture Evolution in Rolled Pure Titanium

2018 ◽  
Vol 186 ◽  
pp. 02002
Author(s):  
Huanping Yang ◽  
Yaomian Wang
Keyword(s):  
Cold Rolling ◽  
Shear Deformation ◽  
Texture Evolution ◽  
Pure Titanium ◽  
Rolling Texture ◽  
Fiber Texture ◽  
Relative Contribution ◽  
Pyramidal Slip ◽  
Roll Gap ◽  
Cold Rolling Texture

The cold rolling texture evolution under different strain states caused by coupled effects from different combinations of roll gap geometry and friction in pure titanium with initial typical recrystallized texture has been studied using viscoplastic self-consistent simulations. Under plane strain state, the texture is dominated by a typical cold rolling fiber texture RD//<1010> in pure titanium. However, when shear deformation is induced and increased, RD//<1010> fiber texture is decreased, whereas basal texture (0001)[1010] is increased and a strong partial fiber texture RD//<2110> is formed. The variation of cold rolling texture at different strain states can be ascribed to variation of relative contribution from activation of prismatic, basal and pyramidal slip.

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.

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.

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 The Influence of a Novel Inorganic-Polymer Lubricant on the Microstructure of Interstitial-Free Steel during Ferrite Rolling

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 178
Author(s):  
Ning Kong ◽  
Jie Zhang ◽  
Hongbo Li ◽  
Boyu Wei ◽  
David R. G. Mitchell
Keyword(s):  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Rolling Texture ◽  
Fiber Texture ◽  
Lubricating Oil ◽  
Interstitial Free ◽  
Shear Texture ◽  
Lubrication Performance ◽  
Ferrite Rolling ◽  
Very High

A novel polyphosphate lubricant was used and evaluated during hot (ferrite) rolling of an interstitial-free (IF) steel. The texture evolution of these rolled IF steels have been examined by means of X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) measurements. The polyphosphate lubricant shows an improved lubrication performance in terms of the texture optimization compared with lubricating oil and with unlubricated conditions. The γ-fiber texture is enhanced, and less shear texture is produced. This microstructure is responsible for enhanced drawability of ferrite rolled IF steels. The very high thermal stability of the polyphosphate enabled its use at very high temperatures (from 700 to 800 °C). Rolling temperature exerted limited influence on the resulting rolling texture evolution. The polyphosphate lubricant stabilizes the surface texture and reduces the gradient of shear texture through the thickness. The in-grain shear bands are reduced significantly (48.5%) compared with the unlubricated condition. Measured grain orientations indicate that the favorable texture of {111}<112> along the γ-fiber is developed while the undesired α-fiber texture of {001}<110> is effectively suppressed.

Analysis of Deformation Texture in AISI 304 Steel Sheets

2013 ◽  
Vol 203-204 ◽  
pp. 105-110 ◽  
Author(s):  
Agnieszka Kurc-Lisiecka ◽  
Wojciech Ozgowicz ◽  
Wiktoria Ratuszek ◽  
Joanna Kowalska
Keyword(s):  
Cold Rolling ◽  
Rolling Texture ◽  
Orientation Distribution ◽  
Deformation Texture ◽  
Distribution Functions ◽  
Rolled Strip ◽  
Aisi 304 ◽  
Aisi 304 Steel ◽  
Cold Rolled ◽  
Two Phases

The textures of cold-rolled AISI 304 austenitic steel were the object of the investigations. The austenite steel was deformed by cold-rolling to 20, 40 and 70% reduction. A significant amount of martensite, formed due to the strain induced (γ®a’) transformation, was detected in the deformed structure by applying magnetic and X-ray diffraction methods. Texture analysis was performed on the basis of the orientation distribution functions (ODFs) calculated from the experimental pole figures. The texture measurements of both phases were conducted from the center layers of the cold-rolled strip. In the case of metastable austenite AISI 304 steel the texture development was very complex because three processes were proceded simultaneously during the cold-rolling, namely: plastic deformation of the austenitic g-phase, strain induced phase transformation γ®a’ and deformation of the formed a’-martensite. These processes resulted in the presence of two phases in the structure of the steel with a definite crystallographic relationship and orientation changes of both phases with increasing of the deformation. Thus, the resultant deformation texture of the investigated steels is described by the austenite and martensite texture components. The rolling texture of γ-phase describes mainly orientations from the fiber α =<110>║ND and the major components of the martensite deformation texture are orientations from the fibers α1=<110>║RD and γ ={111}║ND.

The Texture Evolution of Dual Phase Steel Sheets

2007 ◽  
Vol 26-28 ◽  
pp. 51-54
Author(s):  
Yan Dong Liu ◽  
Q.W. Jiang ◽  
He Tong ◽  
Yan Dong Wang ◽  
Liang Zuo
Keyword(s):  
Cold Rolling ◽  
Recrystallization Texture ◽  
Dual Phase Steel ◽  
Single Phase ◽  
Texture Evolution ◽  
Rolling Texture ◽  
Dual Phase ◽  
Steel Sheets ◽  
Cold Rolling Texture ◽  
Martensite Microstructure

in this paper, the texture evolution of cold rolling and recrystallization of dual phase steel sheets is studied. The experimental results show that the cold rolling texture components are γ fiber (<111>//N.D.) and α fiber (<110>//R.D.). After heat treatment (austenizing temperatures 960°C and 980°C, 0.7°C/S cooling to 650°C, a rational holding time to form ferrite and martensite microstructure), the texture components are still γ fiber and α fiber, the recrystallization texture in dual phase steel sheet is remarkable different compared to the recrystallization texture in the pure (single phase??) ferrite.

scholarly journals Mechanical Anisotropy Induced by Strain Path Change for AZ31 Mg Alloy Sheet

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1049
Author(s):  
Chong Yang ◽  
Yibing Mei ◽  
Dan Meng ◽  
Guoguo Zhu ◽  
Shengwei Liu ◽  
...  
Keyword(s):  
Yield Strength ◽  
Strain Path ◽  
Texture Evolution ◽  
Rolling Direction ◽  
Mechanical Anisotropy ◽  
Heterogeneous Distribution ◽  
Az31 Sheet ◽  
Strain Paths ◽  
Strain Path Change ◽  
Strain Path Changes

The variation of strain paths induces anisotropy during practical sheet forming processes, which is very important for the subsequent processing technology of anisotropic Mg alloys. In this study, two-step loading tests (tension-tension) were performed to clarify the effect of strain path changes on the evolution of anisotropy on rolled AZ31 sheet. Specimens were preloaded with tension along the rolling direction (RD) with 9% of prestrain. Then, second tension was conducted along 0°, 30°, 45°, 60° and 90° from the RD. It was found that yield strength during the second loading increased along the same direction compared to uniaxial tension without prestraining. For the second loading, the yield strength and flow stress decreased with the increase of the angle from the RD. It was found that the strain path change resulted in stronger anisotropy than that induced by texture. Moreover, it was found that the main deformation modes were basal and prismatic slips during the second loading based on visco-plastic self-consistent (VPSC) modeling. The relative activities of basal and prismatic slips were affected by the second loading direction due to texture evolution. The mechanical anisotropy induced by strain path changes was ascribed to the coupling of the heterogeneous distribution of dislocations and texture evolution induced by prestraining.

Sign in / Sign up

Export Citation Format

Share Document