Microstructural evolution of sulfide in Fe-Cr-S alloys

H. Mitsui, K. Oikawa, I. Ohnuma, K. Ishida

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

Morphology of sulfide and grain growth of Fe-1Cr-0.05S and Fe-8Cr-0.05S alloys were investigated by optical and electron scanning microscopes. Very fine spherical sulfide is formed through a remelting reaction (δ→γ+liquid) in the Fe-1Cr-0.05S alloy, while very fine spherical and rod-like sulfides formed through a eutectoid reaction (δ→γ+sulfide) are observed in the Fe-8Cr-0.05S alloy. Variations of sulfide size and grain radius of the matrix with time were examined at 600°C. It was found that the sulfide has a significant effect on the retardation of grain growth. The relation between the size of sulfide r and the grain radii of matrix R can be expressed by a Zener-type equation, R = β·r / fvm, where the value of the pinning factor β is between 4/3 and 4/9 and the volume fraction exponent m = 1.

Original languageEnglish
Pages (from-to)993-998
Number of pages6
JournalMaterials Science Forum
Volume426-432
Issue number2
DOIs
Publication statusPublished - 2003
Externally publishedYes
EventThermec 2003 Processing and Manufacturing of Advanced Materials - Madrid, Spain
Duration: 2003 Jul 72003 Jul 11

Keywords

  • Chromium sulfide
  • Grain size
  • Heat resistant steels
  • Phase diagram
  • Pinning effect
  • Vickers hardness

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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