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A new procedure consisting of the cross shear rolling (CSR) and the subsequent tertiary recrystallization annealing under dry hydrogen atmosphere was developed to produce the grain oriented ultra-thin silicon sheets less than 0.1 mm with high magnetic property performance. For comparison, the conventional rolling (CR) was also used to process the grain oriented ultra-thin silicon steel sheets. The effect of processing parameters on magnetic properties of the grain oriented ultra-thin silicon steel sheets was investigated. With the increase of annealing temperature and holding time, magnetic properties of the sheets processed by both rolling methods reach saturation as the result of the proceeding of the tertiary recrystallization. The thin sheets rolled by CSR did achieve better magnetic properties than those rolled by CR. 相似文献
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Yubui SHA Fang ZHANG Song LI Xaoyu GAO Jiazhen XU Liang ZUO School of Materials Metallurgy Northeastern University Shenyang China 《材料科学技术学报》2004,20(3):253-256
The recrystallization texture in grain oriented silicon steel sheets, which were annealed at different primary annealingtemperatures with and without an electric field, was investigated. An automated electron backscattered diffraction(EBSD) technique was used to analyze the recrystallization texture. It was found that recovery and application ofelectric field in primary annealing lead to an increase of {001} component and a decrease of {111} component afterannealing at 900℃. The development of recrystallization texture can be explained in terms of the effects of electricfield and primary annealing temperature on recovery. 相似文献
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Guoliang Hu Yaohua Zhu Guoyi Tang Chanhung Shek and Jianan Liu Materials Department Advanced Materials Institute Tsinghua University Shenzhen China 《材料科学技术学报》2011,(11):1034-1038
Electropulsing-induced recrystallization and its effect on mechanical properties of oriented silicon steel strips (Fe-3.0%Si) were studied by optical microscopy, scanning electron microscopy and electron back-scatter diffraction. The results indicated that electropulsing accelerated recrystallization, and decreased the temperature of recrystallization. Electropulsing favors refinement of the grain structure of the alloy. Effects of electropulsing on strength and elongation of the alloy were discussed from the point view of dislocation dynamics, microstructural changes, and electropulsing kinetics. 相似文献
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通过控制初次再结晶工艺获得尺寸不同的低温渗氮取向硅钢初次再结晶组织,研究初次晶粒尺寸对二次再结晶行为和磁性能的影响,探索初次晶粒尺寸过大条件下合适的渗氮量,并分析初次再结晶组织中{411}〈148〉织构对二次再结晶行为的影响。结果表明:随着初次晶粒尺寸由10μm升高至15μm,二次再结晶温度升高,Goss织构更加锋锐,成品磁性能提高,当初次晶粒尺寸为28μm时,合适的渗氮量约为6×10-4。初次再结晶组织中{411}〈148〉取向晶粒生长能力更强,极易粗化,阻碍二次晶粒的异常长大,同时{411}〈148〉与黄铜晶粒之间为大于45°的低迁移率晶界,对黄铜晶粒异常长大的阻碍作用更为显著。 相似文献
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Effects of high magnetic field on recrystallization, coarsening after primary recrystallization and texture evolution were studied in non-oriented and oriented 3% silicon steels. The highest applied magnetic field strength was 10 Tesla. It was found that primary recrystallization process and coarsening after primary recrystallization are both retarded by the application of magnetic field during annealing. A difference between primary recrystallization textures annealed with or without a magnetic field was found in both non-oriented and oriented 3% silicon specimens. It was found that the amount of texture component { 111 }<112> increases by the application of magnetic field during annealing. 相似文献
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本文系统介绍了取向硅钢与无取向硅钢表面绝缘涂层,包括有机涂层、无机涂层和半无机涂层三大类。无机涂层具有良好的耐热和焊接性能,但其冲制性和粘结性不佳。半无机涂层具有良好的冲制性和粘结性,但其耐热性和焊接性不及无机涂层。另外,最新研究的取向硅钢表面物理气相沉积TiN、CrN和TiC绝缘涂层可使硅钢获得极低的铁损,大大提高了硅钢的磁通量密度,并具有优异的耐热、焊接、冲制和粘结性。 相似文献
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通过EBSD实验获取了薄规格取向硅钢(0.18 mm厚)初次再结晶样品表面晶粒组织的取向数据,并以此构建模拟的初始组织.采用Potts模型Monte Carlo方法对薄规格取向硅钢初次再结晶样品的二次再结晶过程进行了模拟仿真,研究了表面能对Goss织构演变的影响.模拟结果表明:Goss取向晶粒与相邻晶粒的表面能差是Goss取向晶粒异常长大的重要驱动力;表面能差存在一个临界值(约12%),只有当表面能差大于此临界值时才会发生表面能驱动Goss取向晶粒的异常长大. 相似文献
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1. IntroductionSilicon steel is widely used as core materials oflarge transformers and large rotating machines. AfterWalter et al.11] reported that a difference in surface en. ?ergy induced tertiary recrystallization, very thin (lessthan 100 pm) grain oriented silicon steels producedby using tertiary recrystallization phenomena in vacuum have excellellt soft magnetic properties[2]. Nevertheless, since starting material using grain orientedsilicon steel sheet after secondary recrystallization i… 相似文献
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采用EBSD技术对不同退火工艺处理后的冷轧取向硅钢超薄带样品进行研究,分析退火样品的显微组织、织构与磁性能的关系,讨论母材性能对超薄带性能的影响。结果表明:冷轧超薄带的退火组织均匀、Goss取向度高以及母材磁性能优良均可有效提升磁性能;退火升温速率主要影响晶粒尺寸、Goss取向度及磁性能;再结晶的平均晶粒尺寸改变,会影响最终超薄带的磁感应强度及铁损;在900℃退火5 min以上会明显发生再结晶,10~30 min内退火的超薄带磁性能变化较小,退火15 min获得最佳磁性能。此外,在1000℃及1100℃下退火的时间均不宜超过10 min,否则会恶化磁性能。 相似文献
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为减少高硅钢铁芯叠片间的涡流损耗,以磷酸二氢铝、苯丙乳液、甘油及水为主要原料,制备出一种适合高硅钢用无铬环保半有机绝缘涂层.利用光电子谱仪、扫描电镜及能谱仪对高硅钢脱碳退火板的氧化薄膜、绝缘涂层的微观结构形貌及部分缺陷进行分析,并研究了该涂层的涂覆量对其附着性、硬度及绝缘性能的影响.研究结果表明:普通无取向硅钢磷酸盐环保半有机绝缘涂层同样适用于高硅钢;绝缘涂层的均匀性取决于高硅钢片表面的平整度、涂辊表面质量以及对涂覆速度的平稳控制;高硅钢的表面粗糙度及氧化膜厚度对绝缘涂层的附着性有着重要影响;本试验制备的半有机涂层每面涂覆量控制在0.8~1.2 g/m2,具有良好的附着性及绝缘性能,层间电阻在5Ω·cm2/片以上. 相似文献
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We have investigated the spatially resolved local electronic properties of a nanostructured film of a colossal magnetoresistive (CMR) material by local conductance mapping (LCMAP) using a variable temperature scanning tunneling microscope (STM) operating in a magnetic field. The nanostructured thin films (thickness ap500 nm) of the CMR material La0.67Sr0.33MnO3 (LSMO) on silicon substrates were prepared using chemical solution deposition (CSD) process. These films have a large density of natural incoherent grain boundaries (GBs) which leads to significantly different behavior compared to oriented and epitaxial films of the same composition. Due to the presence of the GBs, these films show substantial low field magnetoresistance (LFMR) followed by a slower and almost linear decrease at higher fields and this is found to be strictly dependent on particle size. Most of the mechanisms proposed to explain the LFMR in the GB are based on tunneling through the GB. The purpose of this study is to use different STM based techniques to image these inhomogeneities and quantify them to the extent possible. In particular, we study the effect of grain size and the grain boundaries and their role in the electrical transport in nanostructured films of CMR materials 相似文献
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In this work the magnetic induction in grain orientated ultra-thin silicon steel sheets (with a thickness of 0.08 mm) was
calculated by employing the crystal orientation distribution function and the formula for the anisotropy of energy for a single
crystal of cubic symmetry. The incomplete pole figures of {110}, {200} and {112} were measured and the corresponding orientation
distribution function was determined. On the basis of the texture data and the corresponding magnetic anisotropy energy, the
magnetic induction in the ultra-thin silicon steel sheet was calculated. The calculation results are in good agreement with
the experimental measurement. 相似文献
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Commercial grain oriented electrical steels were made by cross shear rolling (CSR) with a chosen mismatch speed ratio 1.1. Original sheets of 0.75 mm thick, which had been produced by conventional cold rolling and intermediate annealing were rolled to thickness from 0.35 mm to 0.15 mm, and followed by industry annealing. The deformation texture and the magnetic properties were measured. Results indicate that: in the condition of the CSR, the deformation texture of rolled sheet is generally similar to that of conventional rolled sheet; for sheets with the thicknesses from 0.35 mm to 0.25 mm, favorable deformation textures, mainly consisting of {111} <112>, are also found at subsudece layers, which may help produce sharp Goss texture, and after the final annealing, the magnetic properties of sheets are not lower than that of conventional rolled sheets 相似文献
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An array of ferromagnetic nanowires embedded in silicon is fabricated using an anodizing and electroplating process. During the former one oriented porous silicon channels are fabricated whereas by the latter process Ni is incorporated into these channels. The electrodeposited Ni-wires have a great pore-length to pore-diameter (aspect) ratio up to 1000 : 1 (typical diameters between 10 and 60 nm, pore-length from 10 to 30 μm). Due to this property the samples exhibit a magnetic perpendicular anisotropy. The micromagnetic properties of Ni (e.g. Bloch-wall thickness) are responsible for the peculiar magnetic behaviour of this ferromagnet/silicon nanocomposite. Structural as well as magnetic investigations like scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDXS), and SQUID-magnetometry display this nanocomposite as a bimodal ferromagnetic structure consisting of perpendicularly oriented Ni-wires and of single domain Ni-granules embedded in the silicon based matrix. The hysteresis curve outlines a two-fold magnetic switching, one at low fields (∼0.05 T) and the second at high fields (> 3 T). The micromagnetic magnetization reversal is treated in terms of an analytic formulation. 相似文献
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Modelling primary recrystallization and grain growth in a low nickel austenitic stainless steel 总被引:2,自引:0,他引:2
A. Di Schino J. M. Kenny I. Salvatori G. Abbruzzese 《Journal of Materials Science》2001,36(3):593-601
This paper deals with the recrystallization and grain growth processes of a low nickel stainless steel. Samples of steel sheets with various cold rolling degrees were annealed at different temperatures and the recrystallization and grain growth kinetics have been studied. The grain size of the samples has been determined via automatic image analysis and transformed to 3-D values according to the Saltykov model. The experimental data have been analysed according to a modified model developed using the statistical approach by Abbruzzese and Lucke for the grain growth. This approach supplies a unified equation describing at the same time primary recrystallization and grain growth. The values of the dislocation density obtained from the comparison of theoretical predictions and experimental data of the grain mean radius are properly correlated to the mechanical properties of the steel. 相似文献
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With the objective of optimizing the texture components and exploring a method to improve the magnetic properties of used silicon steel, the methods of one inclined rolling and two inclined rolling were applied. The result shows: the new Goss grains were nucleated except at {111} deformed grains, and also formed at the grain boundary between two deformed grains with {113} orientation, and at grains boundaries between {113} and {100} deformed grain. The grain size after one inclined rolling (57 %) was larger and more homogeneous than the grain size after the two inclined rolling. Although with different cold rolling methods (one and two inclined rolling), the resulted annealing textures all had similar features. The difference was the relative intensities between the main texture. A significant feature of one inclined rolling was the intensification of the η-fiber and the Goss texture component and the weakening of γ-fiber. At an inclination angle of 60°, a significantly strong Goss texture was produced, which was highest among all samples, and the maximum volume fraction of {110}+{100} texture can also be obtained. One inclined rolling can better improve the magnetic properties of used silicon steel (B50), and the magnetic induction is between 1.712 T and 1.742 T. The highest magnetic induction of 1.742 T can be obtained by one inclined rolling (at an inclination angle of 60°). 相似文献