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        Mechanism of MnS Precipitation on Al2O3–SiO2 Inclusions in Non‑oriented Silicon Steel

        Fangjie Li,Huigai Li,Di Huang,Shaobo Zheng,Jinglin You 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.6

        This study investigates the mechanism of MnS precipitation on Al2O3–SiO2 inclusions during the solidification of nonorientedsilicon steel, especially the influence of the phase structures and sizes of the oxides on the MnS precipitation, byscanning electron microscopy and transmission electron microscopy coupled with energy dispersive spectrometry. Theinvestigation results show that MnS tends to nucleate on submicron-sized Al2O3–SiO2 inclusions formed by interdendriticsegregation and that it covers the oxides completely. In addition, MnS can precipitate on micron-sized oxides and its precipitationbehavior is governed by the phase structure of the oxides. The MnS embryo formed in a MnO-containing oxidecan act as a substrate for MnS precipitation, thus permitting further growth via diffusion of solute atoms from the matrix. MnS also precipitates in a MnO-free oxide by the heterogeneous nucleation mechanism. Furthermore, MnS is less proneto precipitation in the Al2O3-rich regions of the Al2O3–SiO2 inclusions; this can be explained by the high lattice disregistrybetween MnS and Al2O3.

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