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In-situ Observation on Precipitation of Inclusion in Non-oriented Silicon Steel
Pages: 29-32
Year: Issue:  5
Journal: Electrical Engineering Materials

Keyword:  non-oriented silicon steelinclusionprecipitationin-situ observation;
Abstract: Based on the high temperature confocal microscope, the chage of size, type, and quanti-ty of inclusions in non-oriented silicon steels with different Mn content were observed by in-situ SEM. Results show that the inclusion quantities are 10 million per mm3 and 16 million per mm3, while the mass fractions of Mn are 0.77% and 0.32%, respectively. In the silicon steel with higher Mn content, the spherical and ellipsoidal MnS inclusion will precipitate first, which can retard the precipitation of AlN and CuxS effectively. The quantity of the inclusion is smaller, while the size is larger. On the other hand, in the silicon steel with lower Mn content, the MnS inclusion will precipitate first, which can be adopted as the core of AlN inclusion to form the complex inclusion, MnS and AlN, during the reheating and cooling process. Both the quantity and the size of the complex inclusion are larger.
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