Grain size control by oxide dispersion in austenitic stainless steel

Koji Takano, Ryuji Nakao, Shigeo Fukumoto, Toshihiro Tsuchiyma, Setsuo Takaki

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The difference in the deoxidation condition between Al-Ca system and Si-Mn system was discussed in terms of grain growth behavior of an austenitic stainless steel (Fe-17%Cr-9%Ni-3%Cu-low C, N alloy). In the steel deoxidized by Si-Mn, oxide inclusion exists as MnO-SiO2 particles in the as-cast ingot. However, once this steel is annealed at 1523K for 3.6ks, a part of MnO-SiO2 particles decomposes and MnO-Cr2O3 particles are newly formed on the annealing. The particle size of MnO-Cr2O3 is about 0.2 μm span and this size is much smaller than that of MnO-SiO2 particles (about 1 μm). This oxide transition from MnO-SiO2 to MnO-Cr2O3 is very useful for suppressing the grain growth of recrystallized austenite grains on annealing at 1373K after 65% cold working because the reprecipitated fine oxide particles pin the austenite grain boundary effectively. The relation between austenite grain size and oxide particles dispersion is not explained by the well-known Zener's relationship but done by the Doherty's theory in which a half of particles are thought on grain boundary and play a role to pin the grain boundary. On the other hand, in the steel deoxidized by Al-Ca, stable Al2O3-CaO particles are formed in the as-cast ingot. This oxide is so stable that it never causes the oxide transition on annealing like that in the steel deoxidized by Si-Mn. Therefore, the grain refining through recrystallization process is never expected in the steel deoxidized by Al-Ca.

Original languageEnglish
Pages (from-to)616-622
Number of pages7
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume89
Issue number5
DOIs
Publication statusPublished - Jan 1 2003

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austenitic stainless steels
Austenitic stainless steel
Steel
Oxides
grain size
oxides
Austenite
Grain boundaries
steels
Annealing
Ingots
austenite
Grain growth
grain boundaries
ingots
Cold working
annealing
casts
Refining
cold working

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

Cite this

Grain size control by oxide dispersion in austenitic stainless steel. / Takano, Koji; Nakao, Ryuji; Fukumoto, Shigeo; Tsuchiyma, Toshihiro; Takaki, Setsuo.

In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 89, No. 5, 01.01.2003, p. 616-622.

Research output: Contribution to journalArticle

Takano, Koji ; Nakao, Ryuji ; Fukumoto, Shigeo ; Tsuchiyma, Toshihiro ; Takaki, Setsuo. / Grain size control by oxide dispersion in austenitic stainless steel. In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan. 2003 ; Vol. 89, No. 5. pp. 616-622.
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abstract = "The difference in the deoxidation condition between Al-Ca system and Si-Mn system was discussed in terms of grain growth behavior of an austenitic stainless steel (Fe-17{\%}Cr-9{\%}Ni-3{\%}Cu-low C, N alloy). In the steel deoxidized by Si-Mn, oxide inclusion exists as MnO-SiO2 particles in the as-cast ingot. However, once this steel is annealed at 1523K for 3.6ks, a part of MnO-SiO2 particles decomposes and MnO-Cr2O3 particles are newly formed on the annealing. The particle size of MnO-Cr2O3 is about 0.2 μm span and this size is much smaller than that of MnO-SiO2 particles (about 1 μm). This oxide transition from MnO-SiO2 to MnO-Cr2O3 is very useful for suppressing the grain growth of recrystallized austenite grains on annealing at 1373K after 65{\%} cold working because the reprecipitated fine oxide particles pin the austenite grain boundary effectively. The relation between austenite grain size and oxide particles dispersion is not explained by the well-known Zener's relationship but done by the Doherty's theory in which a half of particles are thought on grain boundary and play a role to pin the grain boundary. On the other hand, in the steel deoxidized by Al-Ca, stable Al2O3-CaO particles are formed in the as-cast ingot. This oxide is so stable that it never causes the oxide transition on annealing like that in the steel deoxidized by Si-Mn. Therefore, the grain refining through recrystallization process is never expected in the steel deoxidized by Al-Ca.",
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