Papers by Keyword: ODF

Abstract: In the present research, the texture variation during cold rolling of cladded 3003 type aluminium sheets was examined by means of X-ray diffraction. The aluminum sheets were formed in a series of 14 rolling steps, after which texture examinations were performed on both cladded and base material sides of the sheets. After certain rolling steps, the texture was also examined by removing layers from the sheets by electropolishing to reveal the texture distribution along depth. The texture was characterised through the calculation of volume fractions of the main rolled texture components. Local drawbacks were found in the texture versus thickness reduction function. The texture was found to be higher in the middle of the sheets than at the surface.

Abstract: Dual-phase (DP) steel sheets composed of both soft ferritic and hard martensitic phases are typical advanced high strength steel sheets applicable to a variety of automobile parts. The crystallite texture of the steel sheet is one of the important factors that influence press formability. However, the texture of the martensite itself in DP steels has not been discussed since the texture was generally measured by the X-ray diffraction method, which does not distinguish the texture of martensite from that of ferrite. The objective of this study is to investigate the effects of intercritical and γ single-phase annealing on the texture evolution in DP steels by a newly-developed analysis method using Electron Back-Scatter Diffraction (EBSD) to obtain the texture of each phase separately. The chemical composition of the steel used was 0.1%C-1.2%Si-2.3%Mn-0.1%Ti (mass%). The 1st-annealing was carried out at 948K, which is below the Ac₁ temperature, in order to finish recrystallization after hot and cold rolling so as to focus on the transformation texture evolution itself. The steels were subsequently annealed both at 1123K in the intercritical region and at 1223K in the γ single-phase region to obtain DP microstructures with approximately 40% volume fraction of martensite. The overall texture including martensite in the case of intercritical annealing was similar to the initial texture before annealing, while the texture became randomized in the case of γ single-phase annealing. Moreover, our unique EBSD analysis method clearly showed that the textures of the martensite themselves were close to those of ferrite under the two annealing conditions.

Abstract: This research uses pellets of non- and sintered pure Nb and the superconducting intermetallic compound of Nb₃Sn. Sintering was undertaken at 700 °C for 96 hours. The texture data were obtained by using XRD Brüker D8 Advance equipped with gonio-texture and interpreted into namely inverse pole figures, pole figures, and orientation distribution function (ODF). In general, the pole figure analysis indicates that sintering process can lead to a change in the crystal orientation distribution from symmetric or random orientation into preferred orientation. Uni-axial compacting pressure in samples prior to sintering favors the appearance of a preferred orientation on a specific direction. However, this texture is not only retained upon subsequent sintering, but can become much more pronounced or weaker due to the crystal growth occurring at elevated temperatures. The main feature of initial texture for pure compacted Nb obtained in this study is Brass, S, and Copper with Brass being the maximum, whereas Cube and Goss appear as minor components. Upon sintering, it has been found that S, Brass, and Copper retained as the dominant ones, with S has been developed and being the maximum. On the contrary, a significant change in texture upon sintering has been obtained for Nb₃Sn, namely Copper, S and Brass components with minor Cube and Goss components for initial condition, and Copper, Goss and Brass with minor Cube and S components for sintered sample. It is noted that the Copper intensity of Nb₃Sn decreases from 50.4 to 39.3 multiple of random distribution (m.r.d) for the initial and upon sintering conditions, respectively.

Abstract: According to the research of the process conditions of Si electro-deposition, we can see the diffusion mechanism of Si as well as the influence in Fe-3%Si alloy, Analyzing the surface topography, the silicon content distribution in section layer and the texture, it is clear that with method of electro-deposition we can get a certain sedimentary thickness of sediments. And with the extension of electro-deposition time α fibrous structure and γ fibrous structure increase gradually.

Abstract: the conditions of the electro-deposition effect the performance of deposition sample greatly. Determining the texture of the samples of the substrate and the electro-deposition, comparing and analyzing the change rule of the texture, it is clear that after electro-deposited, the intensity of the γ fiber texture increases. And with the change of the electro-deposition temperature, the intensity of the γ fiber texture changes.

Abstract: Although the intention of OWL is to provide an open, minimally constraining way for representing to represent rich and complex knowledge about things, there exists an increasing demands for the efficiency of course data generating. Addressing this issue, we present the ODF: a new OWL-based Linked Course Data generating framework, which makes it possible to specify semantic data directly. Generating such data directly does not only help in maintaining course data quality, but also opens up new optimization opportunities for link sources and, most importantly, makes generating process easier for users and system developers. We present OWL-based Linked Course Data generating framework and discuss the impact on Linked Data.

Abstract: The change in crystallographic orientation distribution during deformation by deep drawing in mild steel has been investigated in order to understand their role in initiation and propagation of crack. The results show that the change of grain orientation from the initial recrystallization texture component of {111}<112> to deformation orientation {111}<110> incites the initiation and propagation of transgranular cracking in the region of {111}<112> small grains. Moreover, the transgranular misorientation and local orientation are analyzed in detail to discuss the change from {111}<112> to {111}<110>. The SEM-EBSD technique was used to reveal that change of orientationm, XRD was performed for the characterization of the global evolution of texture for deformed samples.

Abstract: Formability and mechanical properties of metal sheets are related to on their textures. It has been studied to improve the formability and change the texture of the AA 3003 Al alloy sheets after asymmetric rolling. Asymmetrically rolled Al sheets are shown the high intensity of the distorted cube texture, {001}, distorted rotated cube texture, {001}, weak γ-fiber, ND//, {123}, {120} and {120} components. After the asymmetrically rolled AA 3003 Al alloy sheets, the plastic strain ratios of the asymmetrically rolled Al alloy sheets were about 1.7 times higher than those of the initial Al sheets. The variation of plastic strain ratios of the asymmetrically rolled Al alloy sheets could be related to the change of texture components through asymmetrical rolling in AA 3003 Al sheet.

Abstract: Texture of Al alloy is affected to the formability and mechanical properties. In this paper, it was studied that the change of texture and formability of AA 1050 Al alloy sheets which were asymmetrically rolled. Asymmetrically rolled Al sheets showed that the distorted rotated cube texture, {001}, γ-fiber, ND// and {120} and {120} components were increased. The change of texture components after the asymmetrical rolling could be affected to the variation of plastic strain ratios of the asymmetrically rolled AA 1050 Al alloy sheets.

Abstract: Texture formation during an austempering treatment of a TRIP-assisted steel was studied by in-situ texture measurements with a high energy source (synchrotron). Samples from a cold rolled sheet were subjected to a complete heat treatment cycle for TRIP steels including reheating to the intercritical (α+γ) temperature region, isothermal soaking and bainitic holding (austempering) at 400°C for 600s. At specific points of the thermal cycle {200}γ, {220}γ {222}γ, {331}γ and {200}α, {211}α and {220}α Debye rings were recorded and the corresponding incomplete pole figures were calculated. The latter were used to derive the orientation distribution functions (ODFs) of BCC and FCC phases at specific steps of the annealing process after assuming the orthotropic sample symmetry. The acquired data for the texture evolution during the α–γ–α phase transformation showed that during the reheating for intercritical annealing the gamma phase with {011} orientation is among the first to nucleate from the recrystallized α phase during heating and the Goss and Cube orientations are among the principal gamma phase components which transform to BCC phase after cooling.