Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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High-Temperature Oxidation of Ti Containing Stainless Steel in O2-N2 Atmosphere

  • Onishi, Hidenori (Department of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University) ;
  • Saeki, Isao (Department of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University) ;
  • Furuichi, Ryusaburo (Department of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University) ;
  • Okayama, Toru (Aomori Advanced Industrial Technology center) ;
  • Hanamatsu, Kenko (Aomori Advanced Industrial Technology center) ;
  • Shibayama, Tamaki (Center for Advanced Research of Energy Technology, Hokkaido University) ;
  • Takahashi, Heishichiro (Center for Advanced Research of Energy Technology, Hokkaido University) ;
  • Kikkawa, Shinichi (Department of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University)
  • Published : 2004.08.01
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Abstract

High temperature oxidation of Fe-19Cr and Fe-19Cr-0.2Ti alloys is studied at 1173-1373 K in 16.5 kPa $O_2$ - balances $N_2$ atmosphere aimed at clarifying the effect of titanium addition. Oxidation rate of Fe-19Cr alloy was accelerated with titanium. For both alloys chromium rich $(Fe,\;Cr)_2O_3$ was formed as a major oxidation product. On Fe-19Cr-0.2Ti alloy, a thin layer composed of spinel type oxide and titanium oxide was also formed and an internal oxidation of titanium was observed. Titanium was concentrated at the oxide surface and internal oxidation zone but a small amount of titanium was also found in the intermediate corundum type $(Fe,\;Cr)_2O_3$ layer. Crystals of corundum type $(Fe,\;Cr)_2O_3$ formed on Fe-19Cr alloy are coarse but that formed on Fe-19Cr -0.2Ti alloys were fine and columnar. Reason for the difference in oxidation kinetics and crystal structure will be discussed relating to the distribution of aliovalent titanium in corundum type $(Fe,\;Cr)_2O_3$ oxide layer.

Keywords

Acknowledgement

Supported by : Ministry of Education, Science, and Sports, Japan

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