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乔家龙,付兵,帅勇,等. 高牌号无取向硅钢全尺寸夹杂物表征[J]. 安徽工业大学学报(自然科学版),2024,41(4):1-9. doi: 10.12415/j.issn.1671-7872.24075
引用本文: 乔家龙,付兵,帅勇,等. 高牌号无取向硅钢全尺寸夹杂物表征[J]. 安徽工业大学学报(自然科学版),2024,41(4):1-9. doi: 10.12415/j.issn.1671-7872.24075
QIAO Jialong, FU Bing, SHUAI Yong, LIU Jianfeng, GUO Feihu. Characterisation of Full-size Inclusions in High Grade Non-oriented Silicon Steel[J]. Journal of Anhui University of Technology(Natural Science). DOI: 10.12415/j.issn.1671-7872.24075
Citation: QIAO Jialong, FU Bing, SHUAI Yong, LIU Jianfeng, GUO Feihu. Characterisation of Full-size Inclusions in High Grade Non-oriented Silicon Steel[J]. Journal of Anhui University of Technology(Natural Science). DOI: 10.12415/j.issn.1671-7872.24075

高牌号无取向硅钢全尺寸夹杂物表征

Characterisation of Full-size Inclusions in High Grade Non-oriented Silicon Steel

  • 摘要: 采用大样电解、扫描电镜(SEM)、透射电镜(TEM)检测分析3.0%Si−0.85%Al−0.27%Mn高牌号无取向硅钢铸坯和成品板中全尺寸夹杂物的形貌、数量,并基于夹杂物种类分析主要夹杂物的来源。结果表明:铸坯中大型夹杂物的含量为2.18 mg/10 kg,引起无取向硅钢成品板表面线状缺陷的大型夹杂物来源于保护渣、顶渣及耐材的复合夹杂物;成品板中尺寸为0.50~5.00 μm的显微夹杂物主要包括Al2O3mCaO•nAl2O3mAl2O3nSiO2mMgO•nAl2O3,AlN和硫化物等复合夹杂物,形貌分布多样化;0.10~1.00 μm微细夹杂物的平均尺寸为0.30 μm,分布密度为4.95×104个/mm2,尺寸主要分布在0.10~0.30 μm范围;小于500 nm的析出相主要为球形或近球形的MnS和Cu2S、矩形的AlN和TiN及部分形貌较为复杂的细小氧化物,尺寸主要分布在50~200 nm范围;50~100 nm析出相面密度为5.23×105个/mm2。钢液温降和二次氧化过程生成的细小氧化物、后序热处理中析出的Cu2S和均热过程未析出的AlN,TiN,MnS均以微细夹杂物析出,钉扎晶界,严重影响晶粒的生长,恶化无取向硅钢磁性能。

     

    Abstract: The morphology and quantity of full-size inclusions in 3.0% Si−0.85% Al−0.27% Mn high grade non-oriented silicon steel billets and finished plates were detected and analyzed with bulk electrolysis, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The sources of main inclusions were analyzed based on the types of inclusions. The results show that the content of large inclusions in the casting billet is 2.18 mg/10 kg.The large inclusions causing linear defects on the surface of non-oriented silicon steel finished plates come from composite inclusions of protective slag, top slag and refractory materials. The micro inclusions of 0.50–5.00 μm in the finished plates mainly include composite inclusions such as Al2O3, mCaO•nAl2O3, mAl2O3nSiO2, mMgO•nAl2O3, AlN, and sulfides, with diverse morphology distribution. The average size of fine inclusions of 0.1–1.0 μm is 0.295 μm, with a distribution density of 4.95×104 particles/mm2, and with size mainly distributed in the range of 0.10–0.30 μm. The precipitates smaller than 500 nm are mainly spherical or nearly spherical MnS and Cu2S, rectangular AlN and TiN, and some small oxides with complex morphologies, with size mainly distributed at 50–200 nm. The density of precipitates with size of 50–100 nm is 5.23×105 particles/mm2. The fine oxides generated during the temperature drop and secondary oxidation processes of molten steel, as well as AlN, TiN, and MnS not precipitated during the homogenization process and Cu2S will precipitate as fine inclusions during subsequent heat treatment, which will pin grain boundaries and seriously affect grain growth, thereby deteriorating the magnetic properties of non-oriented silicon steel.

     

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