Determination of Free Energy of δ-Ferrite/γ-Austenite Interphase Boundary of Low Carbon Steels by In-situ Observation

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概要

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• Phase transformations of δ-ferrite/γ-austenite in low carbon steels containing 0.017 mass% phosphorus are observed <I>in-situ</I> by using a combination of confocal scanning laser microscope with infrared image furnace. Dihedral angles at triple points of one high energy δ/δ grain boundary and two incoherent δ/γ interphase boundaries are measured by holding the sample at temperatures where δ- and γ-phases co-exist in quasi-equilibrium. From the average value of observed dihedral angles, free energy of γ/δ incoherent boundary for a steel with low sulfur content (0.007 mass%) is estimated to be 0.450 J/m2 at <I>ca.</I> 1700 K. The effects of temperature and sulfur content on the dihedral angle and free energy of incoherent δ/γ boundary are also discussed.

• 社団法人 日本鉄鋼協会の論文
• 1998-08-15

著者

• SHIBATA Hiroyuki

  Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University

• YIN Hongbin

  Institute for Advanced Materials Processing, Tohoku University

• EMI Toshihiko

  Institute for Advanced Materials Processing, Tohoku University

• Shibata H

  Institute For Advanced Materials Processing Tohoku University

• Shibata Hiroyuki

  Institute For Chemical Research Kyoto University

• Yin H

  Univ. Colorado At Boulder Co Usa

• Emi Toshihiko

  Institute For Advanced Materials Processing Tohoku University

• Shibata Hiroyuki

  Institute For Advanced Materials Processing Tohoku University

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