Mechanism of isothermal eutectoid transformation in high carbon stainless steels

Toshihiro Tsuchiyama, Yoshinori Ono, Setsuo Takaki

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5 Citations (Scopus)

Abstract

Morphology and growth mechanism of eutectoid structure were investigated in 12mass% Cr steels with various carbon content, by means of microstructural examination with optical and electron microscopes. The alloys were once subjected to full solution treatment at a high temperature, and then held at a lower temperature to perform eutectoid transformation isothermally. 12%Cr-0.7%C steel can complete eutectoid transformation, and carbide particles are dispersed homogeneously. On the other hand, in the low carbon steels (the 0.3% C and 0.15% C), eutectoid transformation occurs only at the first stage of isothermal aging, and then γ-α transformation follows at the later stage. This results in the formation of an inhomogeneous structure composed of a cellular eutectoid structure and ferrite in the low carbon steels. The growth rate of eutectoid structure in the 0.7 mass% C steel is controlled by the lattice diffusion of carbon in austenite, and it can be evaluated theoretically as a function of the lattice diffusion coefficient of carbon in austenite and the thickness of diffusion layer.

Original languageEnglish
Pages (from-to)715-720
Number of pages6
Journalisij international
Volume37
Issue number7
DOIs
Publication statusPublished - 1997

All Science Journal Classification (ASJC) codes

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

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