The effect of surfactant Te on the formation of MnS inclusions was studied by adding different amounts of Te to liquid steel at 1873 K (1600 °C). Coarse and fine MnS inclusions, which were formed, respectively, during and after solidification, were observed. Both types show a chain-like pattern, suggesting that they precipitate in the interdendritic regions. Te significantly decreases the area fraction of the coarse inclusions in the interdendritic regions. Moderate Te additions (25 and 50 ppm) make these inclusions more globular, whereas high Te addition (120 ppm) makes their surfaces rugged. Te also decreases the area fraction of the fine inclusions. High Te addition (120 ppm) modifies these inclusions from faceted to spherical, and makes them homogeneously distributed in the steel matrix. The suppressed precipitation of both coarse and fine MnS inclusions in the interdendritic regions suggests that Te alleviates S segregation. The mechanisms by which Te alleviates S segregation and modifies the morphology of MnS inclusions were discussed.
|ジャーナル||Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science|
|出版ステータス||Published - 2017 10 1|
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