Incomplete transformation of upper bainite in Nb bearing low carbon steels

T. Furuhara, T. Yamaguchi, G. Miyamoto, T. Maki

研究成果: Article査読

30 被引用数 (Scopus)

抄録

Kinetics and microstructure of bainite transformation in Fe-(0·15 or 0·05)C-0·2Si-1·5Mn (mass%) alloys with Nb addition of 0·03 mass%. Bainite transformation occurs at temperatures below 873 K. At 853 K, transformation rapidly proceeds by formation of bainitic ferrite without carbide precipitation, but transformation stasis appears for a certain period in the Nb added alloys leaving untransformed austenite film between neighbouring bainitic ferrites. On the other band, the Nb free alloys do not show such a stasis until the transformation is completed. By further holding, the transformation in the Nb added alloy restarts by forming the mixture of dislocation free ferrite with cementite precipitation in the austenite films. In contrast, bainite transformation accompanying cementite precipitation occurs in both Nb free and Nb added alloys at 773 K, resulting in no difference in transformation kinetics. It is proposed that the incomplete transformation is caused by suppression of ferrite nucleation at interphase boundaries between pre-existing bainitic ferrite and austenite due to Nb segregation.

本文言語English
ページ(範囲)392-397
ページ数6
ジャーナルMaterials Science and Technology
26
4
DOI
出版ステータスPublished - 2010 4 1

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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