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左锐,陆勤阳,刘志鹏,等. 热轧加热对无取向硅钢中AlN和MnS析出相的影响[J]. 安徽工业大学学报(自然科学版),2024,41(4):1-11. doi: 10.12415/j.issn.1671-7872.24071
引用本文: 左锐,陆勤阳,刘志鹏,等. 热轧加热对无取向硅钢中AlN和MnS析出相的影响[J]. 安徽工业大学学报(自然科学版),2024,41(4):1-11. doi: 10.12415/j.issn.1671-7872.24071
ZUO Rui, LU Qinyang, LIU Zhipeng, LI Na, WANG Yongqiang, XIA Xuelan, PEI Yinghao. Effect of Hot Rolling Heating on Precipitated Phases of AlN and MnS in Non-oriented Silicon Steel[J]. Journal of Anhui University of Technology(Natural Science). DOI: 10.12415/j.issn.1671-7872.24071
Citation: ZUO Rui, LU Qinyang, LIU Zhipeng, LI Na, WANG Yongqiang, XIA Xuelan, PEI Yinghao. Effect of Hot Rolling Heating on Precipitated Phases of AlN and MnS in Non-oriented Silicon Steel[J]. Journal of Anhui University of Technology(Natural Science). DOI: 10.12415/j.issn.1671-7872.24071

热轧加热对无取向硅钢中AlN和MnS析出相的影响

Effect of Hot Rolling Heating on Precipitated Phases of AlN and MnS in Non-oriented Silicon Steel

  • 摘要: AlN和MnS等析出相对无取向硅钢的磁性能有重要影响,受热轧加热工艺影响,无取向硅钢中的析出相与免常化工艺实现的效果紧密相关。以1.5%Si−0.3%Al无取向硅钢锻造坯为研究对象,利用热力学软件计算钢中可能的析出相,使用箱式电阻炉在不同温度和保温时间下对实验钢进行热轧加热实验,利用金相显微镜(OM)、扫描电子显微镜(SEM)表征分析析出相的形貌、尺寸及样品晶粒尺寸,研究热轧加热温度和保温时间对实验钢中AlN和MnS析出相的影响。结果表明:实验钢中夹杂物主要为AlN和MnS,当加热温度为1 050 ℃时,保温时间由1 h延长至3 h,细小的AlN和MnS析出相(直径小于1 μm)占比由33%降至19%,平均晶粒尺寸从100.0 μm增加到149.7 μm;保温时间为1 h时,加热温度由1 050 ℃提高至1 150 ℃,细小的AlN和MnS析出相(直径小于1 μm)占比由33%降至7%,平均晶粒尺寸从100.0 μm增加到124.3 μm。不改变其他实验条件,热轧加热温度的提高与保温时间的延长都会使实验钢中AlN和MnS析出相与晶粒尺寸变大,有利于低碳绿色的无取向硅钢免常化生产工艺的实现。

     

    Abstract: The precipitation of AlN and MnS has a significant impact on the magnetic properties of non-oriented silicon steel. Due to the influence of hot rolling heating process, the precipitation phases in non-oriented silicon steel are closely related to the effect achieved by non-normalization process. Taking the forging billet of 1.5% Si−0.3% Al non-oriented silicon steel as the research object, the thermodynamic software was used to calculate the possible precipitates in the experimental steel, and heating experiments were conducted on the experimental steel at different temperatures and holding times using a box type resistance furnace. The morphology, size, and sample grain size of the precipitates were characterized and analyzed using metallographic microscopy (OM) and scanning electron microscopy (SEM). The effects of hot rolling heating temperature and holding time on AlN and MnS precipitates in experimental steel were studied.The results show that the inclusions in the experimental steel are mainly AlN and MnS, when the heating temperature is 1 050 ℃, the holding time is extended from 1 h to 3 h, the proportion of fine AlN and MnS precipitated phases (with a diameter of less than 1 μm) decreases from 33% to 19%, and the average grain size increases from 100.0 μm to 149.7 μm. When the holding time is 1 h, and the heating temperature is raised from 1 050 ℃ to 1,150 ℃, the proportion of fine AlN and MnS precipitated phases (diameter less than 1 μm) decreases from 33% to 7%, and the average grain size increases from 100.0 μm to 124.3 μm. Without changing the other experimental conditions, the increase in the hot rolling heating temperature and the extension of the holding time will both increase the AlN and MnS precipitates and grain size in the experimental steel, which is beneficial for the realization of low-carbon and green non-oriented silicon steel production process without normalization.

     

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