Precipitation characteristics of inhibitors in tin-oriented silicon steel during high temperature secondary recrystallization annealing

doi:10.13251/j.issn.0254-6051.2022.06.030

Abstract

Abstract: The precipitation behavior of inhibitor during high temperature secondary recrystallization annealing of tin-oriented silicon steel was studied by means of transmission electron microscopy (TEM), and the inhibitory effect of the inhibitor on primary recrystallization was analyzed. The results show that in addition to the conventional AlN and MnS precipitates, the precipitates also have a small amount of Sn. AlN and MnS precipitates are the main inhibitors, which have strong inhibitory effect. The Sn has an auxiliary inhibition effect, controlling the size and quantity of AlN precipitates and contributing to the distribution of main inhibitors. These inhibitors begin to precipitate at 600-700 ℃, significantly grows at 900 ℃, and the average size reaches the maximum at 1020 ℃. With the increase of annealing temperature, the size of the inhibitor increases, while the volume fraction and distribution density increase first and then decrease. When the annealing temperature reaches 1000 ℃, the average size of precipitates is about 50.3 nm, the maximum volume fraction is about 3.81%, and the distribution density is about 5.9×10¹⁴ particle/cm³. The inhibition force is comprehensively determined according to the test and Zener factor. Zener factor increases with the increase of annealing temperature, reaches the maximum 139 at 900 ℃, and the distribution density of precipitates reaches the maximum of 8.9×10¹⁴ particle/cm³. At 1020 ℃, the Zener factor is almost zero and the secondary recrystallization process is completed.

Key words: tin, oriented silicon steel, high temperature annealing, inhibitors, precipitates

CLC Number:

TG142.1

Yang Lilin, Guo Xiaoyu, Zhang Niandi, Han Qiang, Li Tao. Precipitation characteristics of inhibitors in tin-oriented silicon steel during high temperature secondary recrystallization annealing[J]. Heat Treatment of Metals, 2022, 47(6): 155-160.

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