Microstructure and Texture Evolution of Fe-Si Steels after Hot Dipping and Diffusion Annealing

2012 ◽  
Vol 706-709 ◽  
pp. 2628-2633 ◽  
Author(s):  
I. Infante Danzo ◽  
Kim Verbeken ◽  
Yvan Houbaert
Keyword(s):  
Surface Energy ◽  
Texture Evolution ◽  
Boundary Migration ◽  
Cube Texture ◽  
Thin Strip ◽  
Diffusion Annealing ◽  
Easy Magnetization ◽  
Electrical Steels ◽  
Columnar Grains ◽  
Twin Roll

A homogenous intensity distribution along the cube texture fibre is important to achieve an easy magnetization in non-oriented electrical steels. Several alternatives have been discussed in literature to achieve this goal namely, tertiary recrystallization (surface energy controlled), decarburization annealing, two step cold rolling (strain induced boundary migration), twin-roll thin strip casting (directional solidification), phase transformation (surface energy anisotropy) and columnar grains formation (selective grain growth). In the present study, a hypoeutectic Al-Si alloy was deposited on the surface of cold rolled Fe-Si steels with a hot dipping simulator and subsequently annealed at 1000°C for different times. This procedure was developed previously in order to enrich the substrate with Al and/or Si and consequently improve their resistivity. Of specific interest was the formation of columnar grains in the low Fe-Si steel after annealing. These columnar grains were found to grow from the surface towards the centre of the substrate. The microstructure and texture in the columnar grains were significantly different than those in the middle of the material. Therefore, the evolution of these features during processing was studied in detail in this work.

Texture Control in Non-Oriented Electrical Steels by Severe Plastic Deformation

2010 ◽  
Vol 160 ◽  
pp. 23-29 ◽  
Author(s):  
Leo Kestens ◽  
Roumen H. Petrov ◽  
Patricia Gobernado ◽  
Elke Leunis
Keyword(s):  
Texture Evolution ◽  
Cube Texture ◽  
Industrial Process ◽  
Rolling Process ◽  
Industrial Plant ◽  
Recrystallization Annealing ◽  
Electrical Steels ◽  
Cross Rolling ◽  
Fibre Texture ◽  
The One

Although plenty of research has already been carried out on the issue of texture control in non-oriented electrical steels, there is not yet a universally applied industrial process to obtain an optimized {001} fibre texture. Among the various laboratory processes that have been studied so far, cross rolling seems to be one of the most promising approaches. For evident reasons cross-rolling cannot be implemented on a conventional continuous rolling line of an industrial plant. In the present study a potential interesting alternative is presented which may deliver a similar texture evolution as the cross rolling process, but can be applied in a continuous line of hot and cold rolling operations followed by recrystallization annealing. By applying severe rolling reductions a very strong rotated cube texture is obtained very much similar to the one that is observed after cross rolling. After annealing, the rotated cube texture changes to a {h11}<1/h,21> fibre texture with a maximum on the {311}<136> component which implies the potential to develop a {001} fibre texture after further processing. It is argued that the appearance of the {311}<136> recrystallization texture component can be attributed to oriented nucleation in the vicinity of grain boundaries between slightly misoriented rotated cube grains.

Preparation of High Silicon Steel by Pulse Electrodeposition in Molten Salt

2011 ◽  
Vol 284-286 ◽  
pp. 1180-1183
Author(s):  
Hai Li Yang ◽  
Guo Zhang Tang ◽  
Yun Gang Li ◽  
Jun Long Li ◽  
Yuan Ming Hiu ◽  
...  
Keyword(s):  
Molten Salt ◽  
Cube Texture ◽  
Orientation Distribution ◽  
Silicon Steel ◽  
Diffusion Annealing ◽  
Easy Magnetization ◽  
Magnetization Direction ◽  
Goss Texture ◽  
High Silicon Steel ◽  
High Silicon

High silicon steel containing 6.5 wt% Si was prepared by pulse electrodepositon in KCl-NaCl-NaF-SiO2molten salt followed by diffusion annealing. The composition, the phase and the evolution of texture during the different production step were analyzed by glow discharge optical emission spectroscopy (GDOES), X-ray diffraction analysis (XRD) and the orientation distribution function (ODF). The results showed that the silicon content of the high silicon steel was about 6.5wt%. The high silicon steel was composed of a-Fe and Fe3Si. After diffusion annealing the undesirable g-fibre type texture {111} <110> and {111} <112> weakened, both easy magnetization direction Goss texture ({110} <001>) and cube texture {100} <001> were intensified.

Columnar Grain Growth with Enhanced Rotation Texture in Temper Rolled NO Silicon Steels

2014 ◽  
Vol 782 ◽  
pp. 201-204 ◽  
Author(s):  
Ivan Petryshynets ◽  
František Kováč ◽  
Mária Molnárová ◽  
Petra Gavendová ◽  
Martin Sopko ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Grain Growth ◽  
Texture Evolution ◽  
Main Idea ◽  
Rolling Process ◽  
Point Of View ◽  
Temper Rolling ◽  
Electrical Steels ◽  
Columnar Grains ◽  
Columnar Grain

The present work investigates texture evolution stages in vacuum-degassed non-oriented electrical steels. The main idea behind the improvement of soft magnetic properties relies on deformation induced grain growth phenomena and heat transport phenomena promoting the preferable formation of columnar grains with so called cube crystallographic orientation {100}<0vw>. In order to achieve the desired orientation with appropriate microstructure state from magnetic properties point of view, we have used an adjusted temper rolling process at elevated temperature and subsequent dynamical annealing in laboratory conditions.

Monte Carlo Modeling of Cube Texture Evolution in Ni-Tapes during Grain Growth

2004 ◽  
Vol 467-470 ◽  
pp. 1075-1080 ◽  
Author(s):  
F. Lin ◽  
Andrew Godfrey ◽  
Mark A. Miodownik ◽  
Qing Liu
Keyword(s):  
Monte Carlo ◽  
Surface Energy ◽  
Grain Growth ◽  
Texture Evolution ◽  
Cube Texture ◽  
Lower Surface ◽  
Primary Recrystallization ◽  
Boundary Misorientation ◽  
Determining Factors ◽  
Grain Boundary Misorientation

After primary recrystallization of highly rolled (>98% reduction) high purity Ni (99.999%) tapes the cube texture fraction can range from 45 - 65%. Annealing at temperatures >1000oC leads to cube texture volume fractions of >95% as a result of grain growth. A Monte Carlo Potts model was used to simulate this annealing process. The starting microstructures for the simulations were generated from experimental data taken using electron backscatter pattern analysis. The simulation results suggest that in addition to the grain boundary misorientation and energy functions used, the misorientation texture and grain sizes are also determining factors in the grain growth process. As the grain size after recrystallization is comparable to the tape thickness, the surface energy of the grains may also be an important factor. Simulations were therefore also carried using a surface energy term. If the cube grains have a lower surface energy then a stronger cube texture is predicted.

Texture Evolution of Commercially Pure Copper during Ultra-Thin Strip Rolling

2014 ◽  
Vol 941-944 ◽  
pp. 1532-1536 ◽  
Author(s):  
Meng Song ◽  
Xiang Hua Liu ◽  
De Lin Tang
Keyword(s):  
Texture Evolution ◽  
Pure Copper ◽  
Cube Texture ◽  
Rolling Texture ◽  
Orientation Distribution ◽  
Distribution Functions ◽  
Thin Strip ◽  
Strip Rolling ◽  
Commercially Pure ◽  
Commercially Pure Copper

Experimental investigation on rolling texture evolution in commercially pure copper thinned from 5.8mm to 20μm by symmetrical rolling and asymmetrical rolling without annealing were carried out via orientation distribution functions and orientation line analysis. The results show that the rolling texture for the sample with initial rotate cube texture {100}<011>mainly consist of C and B, most crystallites aggregate along the α and β orientations lines. The texture density growth rate increased significantly in rolling process. That may relate to size effect of ultra-thin strip. The rate of dislocation reduction was more than dislocation multiplication due to disappear at grain size, when the thickness of ultra-thin strip decreased to an extremely value.

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