Observation of Oxide Formation for Molten Fe-Cr-C Alloy at a High Carbon Region by Oxygen Top Blowing

Ryosuke Mihara, Xu Gao, Shigeru Kaneko, Sunjoong Kim, Shigeru Ueda, Hiroyuki Shibata, Min Oh Seok, Shin ya Kitamura

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The oxide formation behavior during decarburization by top blowing for molten Fe-Cr-C alloy was directly observed. For 11 mass pct Cr alloy at 1673 K to 1723 K (1400 °C to 1450 °C), as well as for 14 mass pct Cr alloy at 1623 K to 1673 K (1350 °C to 1400 °C), oxide particles always formed within several minutes after decarburization started. Also, unstable oxide film followed by stable oxide film formed after C content was decreased to certain levels. For 11 mass pct Cr alloy at 1773 K (1500 °C) and 14 mass pct Cr alloy at 1723 K (1450 °C), only the oxide particle and stable oxide film were observed. For 18 mass pct Cr-5 mass pct C alloy at 1723 K (1450 °C), stable oxide film formed twice. By comparing the critical C and Cr contents of alloy when oxides started to form with the equilibrium relation, the formation of the oxide particle and unstable oxide film was found to be under a nonequilibrium condition, whereas the stable oxide film that formed was near an equilibrium condition. For 11 and 14 mass pct Cr alloy, the decarburization rate stayed constant and was not affected by the formation of the oxide particle or unstable oxide film, but it started to decrease after the formation of the stable oxide film.

Original languageEnglish
Pages (from-to)1035-1051
Number of pages17
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume47
Issue number2
DOIs
Publication statusPublished - 2016 Apr 1

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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