Effect of holding time on solid solution behavior of inhibitors in rare earth oriented silicon steel during reheating
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摘要: 借助OM、激光共聚焦显微镜、质谱仪和电解萃取等设备和方法，研究了添加微量稀土La（质量分数0.0011%）的取向硅钢在轧制前采用不同加热保温时间对抑制剂固溶行为的影响。结果表明：当稀土取向硅钢在1250 ℃分别保温10、20、30 min后，试验钢晶粒尺寸随保温时间延长有先快后慢的长大趋势；三种抑制剂元素Mn、Cu和Al均发生固溶，保温时间对Mn和Cu两种元素的固溶影响明显，固溶量分别由69.8％和43.7％增加至84.2％和85.2％；随着保温时间的延长，稀土取向硅钢中抑制剂的小尺寸未溶物逐渐减少直至消失，较大尺寸未溶物（300～600 nm）逐渐转变为小尺寸未溶物逐步溶入基体中，数量减少且未溶物的类型由复杂逐渐转变为单一。Abstract: In this paper the solid solution behavior of the inhibitor under various holding time in 0.001 1 % La oriented silicon steel during reheating had been investigated by using OM, LM, methods of electrolytic extraction and mass spectrometer. The results showed that grain size of the test steel increased significantly with the holding time prolonging when the rare earth oriented silicon steel was heated to 1 250 ℃ and held for 10, 20 min and 30 min respectively, and the growth trend slowed down after holding time more than 20 minutes. As inhibitor elements, Mn, Cu and Al were all dissolving back, and holding time greatly influenced dissolution of Mn and Cu. The solid solubility of Mn and Cu increased from 69.8% and 43.7% to 84.2% and 85.2% respectively. Furthermore, with the prolongation of holding time, the insoluble small size inhibitors gradually decreased or even disappeared, and those larger ones gradually changed into small size insoluble substances and gradually dissolved into matrix in RE oriented silicon steel. The quantity decreased and the type of insoluble matter changed from complex to single gradually.
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Key words:
- oriented silicon steel with rare earth La /
- heating time /
- inhibitor /
- solid solution
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图 1 试验钢加热至1250 ℃保温不同时间的显微组织形貌
Figure 1. Microstructure of tested steel after reheated at 1 250 ℃ for different times
(a) 10 min; (b) 20 min; (c) 30 min
图 2 试验钢在1250 ℃保温时Al、Mn、Cu的固溶量
Figure 2. The solid solution amount of Al, Mn and Cu in tested steel reheated at 1 250 ℃
图 3 试验钢在1250 ℃保温不同时间的典型未溶物形貌
Figure 3. SEM photos showing undissolved matter in tested steel reheated at 1 250 ℃ for different times
(a) 10 min；(b) 20 min；(c) 30 min
图 4 加热至1250 ℃保温不同时长试验钢中未溶物的面密度及尺寸分布
Figure 4. Surface density and size distribution of undissolved matter in steel reheated at 1 250 ℃ for different times
表 1 试验钢主要化学成分
Table 1. Main chemical compositions of the tested steel
% Si Mn Cu Ti Nb Alt C N S P La 3.04 0.21 0.52 0.0099 0.0090 0.076 0.038 0.0033 0.018 0.007 0.0011 
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