Mechanism of change in chemical composition of oxide inclusions in Fe-Cr alloys deoxidized with Mn and Si by heat treatment at 1 473 K

Hiroyuki Shibata, Koichiro Kimura, Tomoko Tanaka, Shin Ya Kitamura

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

The MnO-SiO 2-type inclusions changed into MnO-Cr 2O 3 type inclusions in an Fe-Cr alloy deoxidised by Mn and Si with a low Si concentration by heat treatment at 1 473 K. At high Si content, the MnO-SiO 2- type inclusion remained stable even after heat treatment. The change in the chemical composition of the oxide inclusions by heat treatment depended on the concentrations of Si and Cr in the Fe-Cr alloys. The mechanism of the change in the chemical composition of the oxide inclusions was investigated by using two experimental methods. The solubility of Cr 2O 3 in MnO-SiO 2 was measured from 1 473 to 1 673 K. The solubility of Cr 2O 3 decreased with temperature. The other experiment was performed using a diffusion couple method between the Fe-Cr alloy and MnO-SiO 2 at 1 473 K to investigate a reaction between them. The formation of MnO-Cr. 2O 3 was observed at the interface. It is found that both the decrease in solubility of Cr 2O 3 and diffusion of Mn, Cr, and Si at the interface between the Fe-Cr alloy and oxide inclusions are important for controlling the change in the chemical composition of the oxide inclusions in the Fe-Cr alloy by heat treatment at 1 473 K.

Original languageEnglish
Pages (from-to)1944-1950
Number of pages7
JournalIsij International
Volume51
Issue number12
DOIs
Publication statusPublished - 2011

Keywords

  • Composition change
  • Diffusion couple
  • Fe-Cr alloy
  • Heat treatment
  • Oxide inclusion

ASJC Scopus subject areas

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

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