低合金鋼のフェライト・ベイナイト変態におけるオーステナイトの炭素濃化挙動

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タイトル別名
  • Carbon Enrichment of Austenite during Ferrite-bainite Transformation in Low-alloy-steel
  • テイゴウキンコウ ノ フェライト ・ ベイナイト ヘンタイ ニ オケル オーステナイト ノ タンソ ノウカ キョドウ

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<p>The bainitic transformation kinetics and carbon enrichment of austenite during isothermal holding at 723–923 K were investigated for an Fe-0.1mass%C-0.5mass%Si-2.0mass%Mn alloy. The transformation progressed rapidly until approximately 50 s, after which transformation stasis was observed at 823 K. The carbon concentration of austenite increased as the transformation proceeded, and showed an almost constant value during stasis. It reached approximately 0.45-0.50% at 823 K, which corresponds to the carbon concentration at the T0’ composition with an additional strain energy of 100 J/mol associated with the transformation. After stasis, a slight increase in the ferrite or bainitic ferrite fraction was observed. The carbon concentration of austenite also increased and reached approximately 0.60%, clearly exceeding the carbon concentration at the T0 composition. These results imply that at the first stage, the bainite transformation occurs and shows the incomplete transformation, following which at the second stage, diffusional ferrite transformation proceeds. The additional strain energy associated with the transformation calculated from the carbon concentration at stasis due to the incomplete bainite transformation tends to decrease as the holding temperature increases. This indicates that strain relaxation due to the transformation occurred at higher holding temperatures.</p>

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  • 鉄と鋼

    鉄と鋼 107 (10), 835-844, 2021

    一般社団法人 日本鉄鋼協会

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