マッシブ変態における誘起圧力の役割

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  • 新井 宏
    日本金属工業株式会社研究開発本部

書誌事項

タイトル別名
  • Role of Stress Induced by Volume Change in Massive Transformation
  • マッシブ ヘンタイ ニ オケル ユウキ アツリョク ノ ヤクワリ

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説明

The controversy as to whether the maximum temperature of the massive transformation is the solvus line or the T0 line has been going on for many years. It now seems well established that the massive β−αm transformation in some Cu or Ag alloy systems can occur inside the α+β two-phase field fairly distant from the solvus line. On the other hand, the massive transformation in ferrous alloys requires a considerable undercooling below the solvus line. Any reasonable interpretation on the plus or minus shift of the massive transformation limit from the solvus line has not yet been proposed.<BR>The aim of this article is to explain the massive transformation by the local equilibrium concept, introducing a mean stress difference induced by the volume change of the transformation. A volume change occurs more or less in the phase transformation. This volume change induces some strain within and around the transforrned phase. The elastic strain balance determines mean stress difference at the interface. The difference changes Gibbs free energy of both phases and shifts the solvus line. This shift is in good agreement with the experimental massive transformation limits. In this way, the local equilibrium can successfuly explain the massive transformation.

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  • 日本金属学会誌

    日本金属学会誌 50 (3), 259-266, 1986

    公益社団法人 日本金属学会

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