Decarburization of Silicon Steel Sheets by Silicon Dioxide and Development of {100}⟨012⟩ Texture

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  • Tomida Toshiro
    Corporate Research & Development Laboratories, Sumitomo Metal Industries, Ltd.

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  • 珪酸化物による珪素鋼板の脱炭と{100}⟨012⟩集合組織
  • 珪酸化物による珪素鋼板の脱炭と{100}〈012〉集合組織
  • ケイサンカブツ ニ ヨル ケイソ コウハン ノ ダッタン ト 100 012 シュウゴウ ソシキ
  • Decarburization of Silicon Steel Sheets by Silicon Dioxide and Development of {100}⟨012⟩ Texture

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Decarburization of silicon steel sheets by silicon dioxide and texture development during the decarburization process have been investigated. Steel sheets with an approximated chemistry of 3%Si-1%Mn-0.05%C were stack-annealed with a SiO2-containing separator under a reduced pressure. During the anneal, C concentration of the sample markedly decreased, being caused by a thermo-chemical reaction between the steel and separator; 2C+SiO2→Si+2CO. Columnar α grains grew from the sheet surface, and therein an evolution of the {100}⟨012⟩ texture took place. An almost completely decarburized 0.35 mm thick sheet by this process consisted of grains of 0.6 mm in diameter, more than 90% of which well aligned to the {100}⟨012⟩ orientation. The decarburization reaction and the mechanism of the {100}⟨012⟩ texture evolution are discussed.

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