フェライトバンドの生因について

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書誌事項

タイトル別名
  • On Formation of Ferrite Band (2nd Report)
  • フェライト バンド ノ セイイン ニ ツイテ

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抄録

The author studied the formation of ferrite band in vacuum-melted steel and sandwich steel plate. The results were as follows: (1) Ferrite band did not form in pure carbon steel but formed in Ni-steel and Sn-steel. The microstructure of Ni-steel was studied with X-ray probe micro-analyser and it was found that Ni was higher in pearlite region and was lower in ferrite region. (2) Ferrite band formed only when steel was slowly cooled between Ar3 and Ar1, and the formation of ferrite band was not affected by the cooling rate over Ar3 and under Ar1. (3) The thickness of ferrite region was affected by the degree of segregation and cooling rate. Hence, it could be explained why ferrite band was eliminated by soaking and formed again by forging. (4) The results showed that the primary cause of formation of ferrite band was the heterogeneity of A3 point. When steel was slowly cooled, the preferential formation of ferrite occured in the A3-higher region and carbon was concentrated in the A3-lower region.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 25 (9), 564-568, 1961

    公益社団法人 日本金属学会

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