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付兵,廖建军,胡金文,等. 渗氮温度对低温高磁感取向硅钢氮化物析出行为的影响[J]. 安徽工业大学学报(自然科学版),2024,41(4):1-12. doi: 10.12415/j.issn.1671-7872.24082
引用本文: 付兵,廖建军,胡金文,等. 渗氮温度对低温高磁感取向硅钢氮化物析出行为的影响[J]. 安徽工业大学学报(自然科学版),2024,41(4):1-12. doi: 10.12415/j.issn.1671-7872.24082
FU Bing, LIAO Jianjun, HU Jinwen, QIAO Jialong, WANG Haijun. Effect of Nitriding Temperature on Nitride Precipitation Behavior of High Induction Oriented Silicon Steel with Low-temperature Reheating[J]. Journal of Anhui University of Technology(Natural Science). DOI: 10.12415/j.issn.1671-7872.24082
Citation: FU Bing, LIAO Jianjun, HU Jinwen, QIAO Jialong, WANG Haijun. Effect of Nitriding Temperature on Nitride Precipitation Behavior of High Induction Oriented Silicon Steel with Low-temperature Reheating[J]. Journal of Anhui University of Technology(Natural Science). DOI: 10.12415/j.issn.1671-7872.24082

渗氮温度对低温高磁感取向硅钢氮化物析出行为的影响

Effect of Nitriding Temperature on Nitride Precipitation Behavior of High Induction Oriented Silicon Steel with Low-temperature Reheating

  • 摘要: 采用扫描电子显微镜(SEM)、透射电子显微镜(TEM),结合能谱仪(EDS)与选区电子衍射(SEAD)对渗氮条件下低温高磁感取向硅钢析出相进行表征分析,探讨渗氮过程氮化物析出与转变机制。结果表明:渗氮处理前,钢中固有氮化物以AlN,AlN+MnS与AlN+CuxS为主,尺寸分布在40~150 nm,析出相在基体中的分布较为弥散,主要在晶粒内部析出,晶界上的析出量较少;经750,900 ℃渗氮处理,渗氮板表层出现大量新析出的氮化物,析出相均分布于晶界及附近与晶粒内部,随渗氮温度的升高,析出相的种类与形貌更复杂多样,尺寸分布范围由50~150 nm减至20~100 nm,其中在120 nm以下析出相的分布密度由9.449×108 个/cm2增至1.649×109 个/cm2,平均尺寸由90 nm减至55 nm,体积分数由5.55%减至3.63%;氮化物析出相沿整个渗氮板厚度方向分布不均匀,但900 ℃渗氮板中心层析出相的分布密度与含量明显更高,平均尺寸明显更小,提高渗氮温度可大幅改善渗氮板中的氮含量与氮化物在板厚方向上分布的均匀性;渗氮温度由750 ℃升高至900 ℃,氮化物析出种类由非晶结构的富Mn的Si3N4→正交晶体结构的MnSiN2或(Si,Mn)N→(Si,Mn,Al)N或(Si,Al,Mn)N→(Al,Si,Mn)N或(Al,Si)N进行转变;渗氮温度对氮化物的热稳定性、氮原子的扩散路径与扩散系数的影响是造成氮化物种类与分布发生变化的主要原因。

     

    Abstract: Scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) and selected area electron diffraction (SEAD) were used to characterize and analyze the precipitated phases of high induction oriented silicon steel with low-temperature reheating under nitriding process, and to explore the mechanism of nitride precipitation and transformation during the nitriding process. The results indicate that before nitriding treatment, the inherent nitrides in the steel are mainly AlN, AlN+MnS, and AlN+CuxS, with a size distribution of 40–150 nm. The distribution of precipitates in the entire matrix is relatively dispersed, mainly within the grains, and the precipitation amount on boundaries is relatively small. After nitriding treatment at 750 ℃ and 900 ℃, a large number of newly precipitated nitrides appear on the surface of the nitriding strip, and the precipitated phases are distributed at the grain boundaries and their vicinity, as well as inside the grains. With the increase of nitriding temperature, the types and morphology of precipitates become more complex and diverse. The main range of phase size distribution on surface chromatography decreases from 50–150 nm to 20–100 nm, and the distribution density of precipitates below 120 nm increases from 9.449×108 particles/cm2 to 1.649×109 particles/cm2. The average size decreases from 90 nm to 55 nm, and the volume fraction decreases from 5.55% to 3.63%. Although the precipitation distribution of the obtained nitrides is uneven along the thickness direction of the nitrided strip, the distribution density and content of the precipitated phases in the central layer of the nitrided strip at 900 ℃ are significantly higher, and the average size is significantly smaller, indicating that increasing the nitriding temperature can significantly improve the uniformity of nitrogen content and nitride distribution in the thickness direction of the nitrided strip. The nitriding temperature increases from 750 ℃ to 900 ℃, and the type of nitride precipitation changes from amorphous structure rich in Mn Si3N4 to orthogonal crystal structure MnSiN2 or (Si, Mn)N→(Si, Mn, Al)N or (Si, Al, Mn)N → (Al, Si, Mn)N or (Al, Si)N. Therefore, the influence of nitriding temperature on the thermal stability of nitrides, the diffusion path and diffusion coefficient of nitrogen atoms is the main reason for the changes in the types and distribution of nitrides.

     

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