Determination of free energy of δ-ferrite/γ-austenite interphase boundary of low carbon steels by in-situ observation

Hongbin Yin, Toshihiko Emi, Hiroyuki Shibata

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

Phase transformations of δ-ferrite/γ-austenite in low carbon steels containing 0.017 mass% phosphorus are observed in-situ 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 0.450J/m2 at ca. 1 700 K. The effects of temperature and sulfur content on the dihedral angle and free energy of incoherent δ/γ boundary are also discussed.

Original languageEnglish
Pages (from-to)794-801
Number of pages8
JournalIsij International
Volume38
Issue number8
DOIs
Publication statusPublished - 1998 Jan 1

Keywords

  • Confocal scanning laser microscope
  • Dihedral angle
  • Free energy
  • Grain boundary
  • Interphase boundary
  • Low carbon steel
  • γ-austenite
  • δ-ferrite

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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