Effect of carbon content on bainite transformation start temperature in middle–High carbon fe–9Ni–C alloys

Hiroyuki Kawata, Toshiyuki Manabe, Kazuki Fujiwara, Manabu Takahashi

研究成果: ジャーナルへの寄稿学術誌査読

5 被引用数 (Scopus)

抄録

Bainite in steel is an industrially useful structure. However, the controlling factor of its transformation start point is not clearly known. In this study, we measured the bainite transformation start temperature (Bs) in Fe–9Ni–C alloys containing 0.3–0.9 mass%C via microstructure observation of the specimens held isothermally between 600 K and 798 K. Bs existed between 758 K and 773 K in all alloys used, and was independent of carbon content. Especially, Bs was higher than T0, at which fcc and bcc of the same composition have the same free energy, at more than 0.3 mass%C. This result was completely different from that of our previous study on low carbon Fe–9Ni–C alloys, in which Bs decreased with the increase in carbon and kept the certain driving force of partitionless transformation from fcc to bcc. Bs in middle–high carbon alloys corresponded to the temperature of the intersection point between T0, at which the driving force is 400 J/mol, and the /( + ) phase boundary. This suggests that the nucleation and growth of bainitic ferrite in austenite containing solute carbon higher than T0 is promoted by the precipitation of cementite in austenite.

本文言語英語
ページ(範囲)165-172
ページ数8
ジャーナルisij international
58
1
DOI
出版ステータス出版済み - 2018
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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