共查询到18条相似文献,搜索用时 46 毫秒
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《材料热处理学报》2016,(3)
使用EBSD和XRD技术研究了1.3%Si无取向硅钢在不同退火温度条件下的微观组织、宏观织构和微观取向。分析了退火温度对此成分体系无取向硅钢再结晶组织和织构的影响;讨论了退火温度与无取向硅钢成品板磁性能的关系。实验结果表明:无取向硅钢的退火温度对其再结晶组织和成品板铁损值有影响,随着退火温度的上升,再结晶晶粒平均尺寸增大且铁损值下降。γ纤维织构是再结晶织构中的优势组分,高斯{110}100织构强度也较高。退火温度对再结晶织构也有影响,随着退火温度上升,γ织构的含量不断上升,其中{111}121织构强度高于{111}110织构强度;退火温度的上升降低了立方{100}100织构和旋转立方{100}110织构但增加了高斯{110}100织构的强度,高斯织构的强度在870℃时达8.8。高斯取向晶粒主要在{111}121取向晶粒附近出现,旋转立方取向晶粒主要出现{111}110取向晶粒附近。由于{111}面织构强度增加和立方织构、旋转立方织构强度的降低,随着退火温度的上升,无取向硅钢的磁感应强度下降。 相似文献
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研究了取向硅钢在初次再结晶过程中的组织和结构变化,包括晶粒长大情况、取向差、重合位置点阵(CSL)及织构的变化。研究表明,820℃盐浴再结晶退火3 s时即完成再结晶,随即发生晶粒长大。在初次再结晶的开始阶段,主要织构是{111}112、{100}110和弱的高斯织构;随着退火时间增加,{100}110织构和高斯织构逐渐减弱,{111}112织构先增强后减弱,并向{111}110和{111}231转化,退火3 min以后出现的{012}001织构是一种促进二次再结晶发展并最终有利于提高二次再结晶磁感和降低铁损的织构。退火时间增加到3 min以后,CSL的∑3晶界比例增加。退火时间增加到30 min时,CSL的∑1晶界比例增加,同时,小角度晶界比例提高,大角度晶界减少。 相似文献
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以实验室模拟CSP连铸连轧工艺制备的热轧硅钢为基板,通过实验室常化、冷轧和初次再结晶退火实验,采用XRD和EBSD技术对样品从热轧到初次再结晶阶段的织构演变进行了研究。结果表明:GOSS晶粒起源于热轧的次表层,沿着次表层到中心层逐渐降低,热轧板中心层主要为{001}110织构。一次冷轧后,次表层存在强的{001}110和{112}110织构;1/4层存在强的{001}110和{112}110以及较强的{111}112织构;中心层则只存在强的{001}110织构。初次再结晶后,硅钢形成了强点{111}112织构的γ织构,GOSS织构再次出现,且分布在{111}112织构周围。GOSS晶粒周围以35°~55°大角度晶界为主,同时还有很高的Σ3和Σ5重合位置点阵。 相似文献
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《材料热处理学报》2016,(4)
利用SEM、EBSD和XRD等相关技术,研究了脱碳退火工艺对基于CSP工艺取向硅钢再结晶退火后的组织、晶界特征及析出相的影响。结果表明,脱碳退火5 min后,取向硅钢的再结晶晶粒尺寸较小,晶界特征理想,高能晶界Σ3和Σ9富集在{111}112、{112}1 10和{332}533等有利取向周围,促进了二次再结晶过程中高斯晶粒的形成;退火时间为7 min时,大角度晶界和{111}112、{112}1 10、{332}533等有利取向数量下降,不利于高斯晶粒的形核和长大;经不同脱碳退火工艺(3 min、5 min和7 min),析出相总体呈弥散状态分布,析出物在脱碳退火5 min的析出细小且分布均匀。 相似文献
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取向硅钢初次再结晶的组织、织构对二次再结晶过程中形成锋锐的高斯织构至关重要。利用OM与EBSD技术,对脱碳退火不同保温时间下各试样初次再结晶组织、织构和晶界的形成规律进行了研究。结果表明:采用850℃保温5 min的脱碳退火工艺,得到的初次再结晶晶粒最为均匀细小,对后续过程中形成高取向的Goss织构有利;经脱碳退火后各试样中织构主要以{111}112、{411}148织构为主,随退火时间的延长,{111}112织构先增强后减弱,{111}110织构逐渐增强;当脱碳退火保温时间为5 min时,高能晶界及大角晶界所占比例最高,在二次再结晶时有较高迁移速率,有助于最终获得锋锐的Goss织构。 相似文献
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低温取向硅钢高温退火抑制剂的演化 总被引:1,自引:0,他引:1
取向硅钢利用析出物作为抑制剂,抑制初次再结晶晶粒的长大,抑制剂是取向硅钢发生二次再结晶的基本条件之一。文中通过低温板坯加热技术制备取向硅钢,采用透射电镜(TEM)观察并研究了高温退火阶段抑制剂的演化过程。结果表明,渗氮后形成的非晶态Si3N4析出物不稳定,在700~750℃退火升温阶段转化为(Al,Si)N;(Al,Si)N颗粒在800℃发生团聚,随后长大并粗化;(Al,Si)N是低温取向硅钢主要抑制剂,随退火温度的升高,(Al,Si)N抑制力大幅下降。 相似文献
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Control of recrystallization during high-temperature hot-rolling of grain-oriented silicon steel 总被引:1,自引:0,他引:1
M. Muraki T. Obara M. Satoh T. Kan 《Journal of Materials Engineering and Performance》1995,4(4):413-417
Recrystallization kinetics of 3 % Si steel after hot rolling in the temperatures between 1373 and 1573 K, which is quite important
to obtain uniform magnetic properties, was studied. Recrystallization rate after hot rolling was relatively slow because of
low dislocation density, which resulted from rapid recovery, and its behavior was strongly influenced by the initial grain
size and coexistence of the γphase. Based on these Findings, controlling technology of recrystallization during hot rolling
of grain-oriented Si steels is discussed. 相似文献
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采用透射电镜研究了含锡取向硅钢高温二次再结晶退火过程中抑制剂的析出行为,分析了抑制剂对初次再结晶的抑制作用。结果表明,析出物除了常规的AlN和MnS外,还有少量Sn单质;其中AlN和MnS相是主要抑制剂,具有强烈的抑制作用;少量Sn相起辅助抑制作用,控制析出物AlN的尺寸和数量,有助于主抑制剂的弥散分布。抑制剂在600~700 ℃时开始析出长大,900 ℃显著长大,1020 ℃平均尺寸达到最大值;抑制剂的尺寸随退火温度升高而增大,体积分数、分布密度则先增大后减少。当退火温度达到1000 ℃时,析出物平均粒径约50.3 nm,体积分数最大约3.81%,分布密度约5.9×1014 个/cm3。根据试验和Zener因子综合判定抑制力,Zener因子随退火温度升高而增加,在900 ℃达到最大139,析出物分布密度达到最大8.9×1014个/cm3;在1020 ℃时,Zener因子几乎为零,完成二次再结晶过程。 相似文献
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取向硅钢低温板坯加热高温二次再结晶退火中抑制剂的析出特点 总被引:1,自引:1,他引:0
利用透射电镜研究了采用"固有抑制剂法"低温板坯加热试制普通取向硅钢冷轧板,高温二次再结晶退火过程中抑制剂的析出行为,分析了各种抑制剂对初次再结晶的抑制作用。结果表明:除常规AlN和AlN+Cu2S析出物之外,还有少量短棒状MnSiN2析出相(正交结构);AlN相具有强烈的抑制效果,起到了主抑制剂作用;少量的MnSiN2相具有辅助抑制作用,同时在高温二次再结晶退火条件下,部分MnSiN2分解并与基体中的Al作用生成AlN,加强了AlN的抑制作用。 相似文献
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Development of low-loss grain-oriented silicon steel 总被引:2,自引:0,他引:2
Y. Ushigami H. Masui Y. Okazaki Y. Suga N. Takahashi 《Journal of Materials Engineering and Performance》1996,5(3):310-315
Grain-oriented silicon steel has evolved through improvement of {110}<001> orientation, development of thinner-gage material,
and development of magnetic domain refining techniques. Core loss in the material has been dramatically reduced over the past
40 years. To further improve core loss, mobile domain walls must be increased by reducing the pinning sites, and surface closure
domains must be decreased by improving {110}<001> orientation. When these technologies are industrialized, a coreloss reduction
of 25% is expected at 1.7 T for 0.23 mm thick grain-oriented silicon steel. 相似文献
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Jirou Harase Ryo Shimizu Jae-Kwan Kim Jong SooWoo 《Metals and Materials International》1999,5(5):429-435
The probability of grains having misorientation angles at 20°–45° (IHE20–45) or a Σ9 orientation relationship (IcΣ9) was determined using the three dimensional orientation distribution obtained from the (100) pole figure. A primary recrystallized
grain-oriented silicon steel specimen capable of evolving a sharp Goss texture was used. It was found that IHE20–45 was higher around the Goss orientation but not the highest in the primary texture. Goss orientation has the highest
IcΣ9 in the primary matrix. The assumption that orientations with a higher IHE20–45 value can be nuclei for secondary recrystallization led to the prediction of secondary recrystallization not being present
in the secondary recrystallization texture. However, no such contradictory prediction was made on the assumption that orientations
with a higher IcΣ9 value can be nuclei for secondary recrystallization. It is concluded, therefore, that grains with misorientation angles
from 20°–45°are not important in the selection mechanism of Goss secondary recrystallization.
This article is based on a presentation made in the symposium “ ’99 International Symposium on Textures of Materials”, held
at Sunchun National University, Sunchun, April 21~22, 1999 under the auspices of The Korean Institute of Metals and Materials
and The Research and Development Center for Automobile’s Parts and Materials. 相似文献
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J. Iwanaga H. Masui J. Harase K. Iwayama N. Takahasi 《Journal of Materials Engineering and Performance》1994,3(2):223-227
The effect of initial texture before cold rolling on secondary recrystallization of grain-oriented electrical steel was investigated
using thin cast sheets and conventional hot-rolled sheets as initial materials. The main texture component of the surface
layer of thin cast sheets is random, while that of the hot-rolled sheets is 110 001. It was found that the optimum cold reduction
for achieving a strong 110 001 texture during secondary recrystallization was 95% and 90% for thin cast sheets and hot-rolled
sheets, respectively.
K. Iwayama, formerly Nippon Steel Corp., Kitakyushu, Fukuoka, Japan 相似文献