Modelling of the microscopic strain heterogeneity during cold rolling of steel sheets. Prediction of the deformation texture

It is well know that Ni-5at.% W(Ni5W) and Ni-9.3at.% W(Ni9W) alloy substrates are two kinds of promising materials to be employed in coated conductors. The Ni5W substrate is very easy to produce cube texture, while the Ni9W alloy has a lower magnetic property and higher strength. However, the pure cube texture are not capable to be obtained in Ni9W alloy. In this work, the preparation and texture development in both Ni5W and Ni9W alloy substrates have been reported. Highly biaxial textured Ni5W substrate was fabricated by cold rolling, followed by three different annealing routes. The texture analysis indicated that a sharp cube texture was formed after annealing at a wide temperature range of 800-1100°C in as rolled Ni5W substrate. The high quality of cube orientation was obtained after a two step annealing (TSA) with farthing twin boundaries analyzed by EBSD. Furthermore, in order to obtain a pure cube texture in Ni9W alloy substrate, a typical rolling process was performed and the deformation texture was optimized in these substrates. The designed deformation texture components were obtained in Ni9W alloy when pre-heating the ingot at 250 °C before performing a cold rolling, which shows a possibility to form cube texture in Ni9W alloy substrate after annealing.

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Effect of Initial Texture on the Deformed Microstructure of IF Steel

Materials Science Forum ◽

10.4028/www.scientific.net/msf.558-559.1395 ◽

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.

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Neutron Diffraction Texture Analysis of Grain-Oriented Steel Sheets

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.105.175 ◽

2005 ◽

Vol 105 ◽

pp. 175-180 ◽

Cited By ~ 1

Author(s):

Stanislav Vratislav ◽

Maja Dlouhá ◽

Ladislav Kalvoda

Keyword(s):

Neutron Diffraction ◽

Cold Rolling ◽

Texture Analysis ◽

Volume Fraction ◽

Rolling Direction ◽

Orthorhombic Symmetry ◽

Automatic Data ◽

Cubic Symmetry ◽

Steel Sheets ◽

Pole Figures

Our laboratory developed and tested experimental and calculation techniques for quantitative texture analysis based on the ODF combined with the diffraction of thermal neutrons. In our work the texture of the Fe-3%Si sheets was investigated after different stages of their processing, i.e. hot-rolled strips, first cold rolling, first inter-annealing, second cold rolling, second annealing and secondary recrystallisation. The texture experiments were carried out on the KSN-2 diffractometer which is equipped with the TG-1 texture goniometer with automatic data collection for transmission and reflection geometry. TODFND (the cubic symmetry of the crystals and orthorhombic symmetry of the specimen) was used and the ODF values were obtained together with all texture characteristics (pole figures, inverse pole figures, ODF - f (g) values, fibre texture with <110> and <001> axis parallel to rolling direction, parameters of the ideal orientations (HKL)<uvw>, texture index J, volume fraction coefficient f. The comparison of the texture parameters of the six samples with the different technologic history is given and the magnetic anisotropy of all measured samples was determined by means of the quantitative texture analysis (ODF-the matrix Cl nµ) for all samples. Results achieved in our study confirm that the quantitative texture analysis in connection with neutron diffraction can help to improve the technology of the preparation of oriented magnetic steel sheets.

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EBSD Study of Substructure and Texture Formation in Dual-Phase Steel Sheets for Semi-Finished Products

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.160.251 ◽

2010 ◽

Vol 160 ◽

pp. 251-256 ◽

Cited By ~ 2

Author(s):

M. Masimov ◽

N. Peranio ◽

B. Springub ◽

Franz Roters ◽

Dierk Raabe

Keyword(s):

Cold Rolling ◽

Annealing Temperature ◽

Texture Evolution ◽

Industrial Process ◽

Dual Phase ◽

Technological Parameters ◽

Dual Phase Steels ◽

Final Annealing ◽

Steel Sheets ◽

Different Temperatures

Using SEM/EBSD the substructure and texture evolution in dual phase steels in the first steps of the process chain, i.e. hot rolling, cold rolling, and following annealing were characterized. In order to obtain dual phase steels with high ductility and high tensile strength an industrial process was reproduced by cold rolling of industrially hot rolled steel sheets of a thickness of 3.75 mm with ferrite and pearlite morphology down to a thickness of 1.75 mm and finally annealing at different temperatures. Such technique allows a compilation of ferrite and martensite morphology typical for dual phase steels. Due to the competition between recovery, recrystallization and phase trans-formation during annealing a variety of ferrite martensite morphologies was produced by promoting one of the mechanisms through the variation of technological parameters such as heating rate, intercritical annealing temperature, annealing time, cooling rate and the final annealing temperature. Annealing induced changes of the mechanical properties were determined by hardness measurements and are discussed on the basis of the results of the substructure investigations.

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Texture Evolution in Non-Oriented Silicon Steel Processed by Twin-Roll Casting

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.452-453.7 ◽

2012 ◽

Vol 452-453 ◽

pp. 7-11 ◽

Cited By ~ 1

Author(s):

Wei Pei ◽

Yu Hui Sha ◽

Fang Zhang ◽

Liang Zuo

Keyword(s):

Cold Rolling ◽

Texture Evolution ◽

Casting Process ◽

Rolling Process ◽

Silicon Steel ◽

Recrystallization Annealing ◽

Twin Roll Casting ◽

Steel Sheets ◽

Roll Casting ◽

Twin Roll

In this paper, non-silicon steel sheets were produced by both twin-roll casting method and conventional process. Orientation characteristics and texture evolution of the sheets during casting, cold rolling and recrystallization annealing were investigated for comparison. It was found that the subsurface of twin-roll casting strips are characterized by weak {100} orientation while the central layer by random orientation. Twin-roll casting process can decrease α fiber (//RD) and increase γ fiber (//ND) during cold rolling process. Consequently, the η fiber (//RD) favorable for magnetic properties of non-silicon steels is enhanced and the detrimental {111} component is suppressed after annealing.

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