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王海军,尹萍,牛宇豪,等. 脱碳退火温度对晶粒取向纯铁组织、织构及磁性能的影响[J]. 安徽工业大学学报(自然科学版),2024,41(4):1-7. doi: 10.12415/j.issn.1671-7872.24038
引用本文: 王海军,尹萍,牛宇豪,等. 脱碳退火温度对晶粒取向纯铁组织、织构及磁性能的影响[J]. 安徽工业大学学报(自然科学版),2024,41(4):1-7. doi: 10.12415/j.issn.1671-7872.24038
WANG Haijun, YIN Ping, NIU Yuhao, QIAO Jialong, QIU Shengtao. Effect of Decarbonization Annealing Temperature on Microstructure, Texture and Magnetic Properties of Grain-oriented Pure Iron[J]. Journal of Anhui University of Technology(Natural Science). DOI: 10.12415/j.issn.1671-7872.24038
Citation: WANG Haijun, YIN Ping, NIU Yuhao, QIAO Jialong, QIU Shengtao. Effect of Decarbonization Annealing Temperature on Microstructure, Texture and Magnetic Properties of Grain-oriented Pure Iron[J]. Journal of Anhui University of Technology(Natural Science). DOI: 10.12415/j.issn.1671-7872.24038

脱碳退火温度对晶粒取向纯铁组织、织构及磁性能的影响

Effect of Decarbonization Annealing Temperature on Microstructure, Texture and Magnetic Properties of Grain-oriented Pure Iron

  • 摘要: 为促进晶粒纯铁制造过程获得更高的磁性能,以实验室自制晶粒取向纯铁冷轧板为研究对象,对其进行脱碳退火实验,利用金相显微镜、电子背散射衍射扫描电子显微镜、磁性能测量仪测试表征其组织性能,研究脱碳退火温度对晶粒取向纯铁初次再结晶组织、织构及高温退火样品磁性能的影响。结果表明:脱碳退火板中仍存在部分聚集分布的细小晶粒,多数集中在样品中心位置附近;脱碳退火2 min、退火温度为775,800 ℃时,部分聚集的细小晶粒导致平均晶粒尺寸分别为6.12,6.39 μm,825 ℃时平均晶粒尺寸为6.85 μm;不同温度脱碳退火板的主要织构类型基本相同,α取向线上主要织构分布在112~223<110>附近,γ取向线上主要织构分布在111<112>和111<110>,其中111<112>织构强度始终最高,其余织构强度随脱碳退火温度升高变化不大;825 ℃×2 min,成品板表现出最佳的磁感应强度,其中B800为1.996 T,B10 000为2.126 T;成品中存在“孤岛”,织构类型为110<112>~<115>,“孤岛”的产生与均热温度较低有关,铸锭中的抑制剂质点没有完全固溶,抑制能力不足,在高温退火过程中导致110<112>~<115>位向的晶粒不同程度长大。“孤岛”的存在侧面表明晶粒取向纯铁的磁感应强度有进一步提升的空间。

     

    Abstract: In order to promote the manufacturing process of grain-oriented pure iron to obtain higher magnetic properties, the cold-rolled sheets of grain-oriented pure iron made in the laboratory were taken as the research object, and the decarburization annealing experiments were carried out. The effect of decarburization annealing temperature on the primary recrystallization microstructure, texture and magnetic properties of high temperature annealed sample of grain-oriented pure iron was investigated by metallographic microscope, scanning electron microscopy with electron-backscatter diffraction and magnetic properties measuring instrument. The results show that there are still some small grains in the decarburization annealing sheet, most of which are concentrated near the central region of the sample. When the decarburization holding time is 2 min and the annealing temperature is 775, 800 ℃, the average grain sizes are 6.12, 6.39 μm, respectively, due to the partial aggregation of small grains, and the average grain size is 6.85 μm at 825 ℃. The main texture type of the decarburized sheet at different temperatures is approximately the same. The main textures on the α orientation line are distributed around 112–223<110>, and the main textures on the γ orientation line are distributed around 111<110> and 111<112>. The intensity of 111<112> texture is always the highest, and the intensity of other textures doesn’t change much with the increase of decarburizing annealing temperature. The final product annealed at 825 ℃ for 2 min show the best magnetic induction, of which B800 is 1.996 T and B10 000 is 2.126 T. There are “isolated” points in the finished product, which have texture types of 110<112>–<115>. The generation of “isolated” is related to the lower homogenization temperature, and the inhibiting agent particles in the ingot aren’t completely dissolved, resulting in insufficient inhibiting ability. So, the grains with 110<112>–<115> orientations grow to different extents during high temperature annealing. Furthermore, the presence of “isolated” points suggests the potential for further enhancement in the magnetic induction of grain-oriented pure iron.

     

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