The Effect of Water Vapor on High Temperature Oxidation of Fe-Cr Alloys at 1073 K

• Ani Mohd Hanafi Bin

  Department of Metallurgy and Ceramics Sciences, Graduate School of Science and Engineering, Tokyo Institute of Technology

• Kodama Toshiya

  Department of Metallurgy and Ceramics Sciences, Graduate School of Science and Engineering, Tokyo Institute of Technology

• Ueda Mitsutoshi

  Department of Metallurgy and Ceramics Sciences, Graduate School of Science and Engineering, Tokyo Institute of Technology

• Kawamura Kenichi

  Department of Metallurgy and Ceramics Sciences, Graduate School of Science and Engineering, Tokyo Institute of Technology

• Maruyama Toshio

  Department of Metallurgy and Ceramics Sciences, Graduate School of Science and Engineering, Tokyo Institute of Technology

抄録

The effect of water vapor on high temperature oxidation was studied based on Wagner’s theory of binary alloy oxidation. The oxidation of Fe-Cr alloys was carried out at 1073 K in dry and humid conditions. The oxidation was conducted in a closed apparatus at 1073 K and the oxygen partial pressure of 1.1×10⁻¹⁴ Pa, which was fixed by a Fe/FeO buffer. To prepare the humid condition, Ar-5% H₂ gas mixture of 3×10⁴ Pa was filled in the apparatus, which provided the water vapor pressure of 3.3×10² Pa. The transition of internal and external oxidation was observed in Fe-8Cr in the dry condition and in Fe-12Cr in the humid condition.<BR>Interdiffusion experiment of Fe/Fe-16Cr diffusion couples in dry and humid environments showed that the diffusion coefficient of Cr was not influenced by dissolved hydrogen.<BR>The oxygen permeability in α-Fe was determined by means of internal oxidation of Fe-5Cr alloy at 1073 K and the oxygen partial pressure of 1.1×10⁻¹⁴ Pa in a dry and two humid conditions with water vapor of 1.1×10² Pa and 3.3×10² Pa. The oxygen permeability in humid condition increases by a factor of 1.4. Dissolved hydrogen increases the oxygen permeability, thus increases the minimum concentration of Cr to form external scales in humid conditions. The presence of dissolved hydrogen changes the oxide shape from discrete spherical particle to spike-like precipitates, which enhances the oxygen transport along the metal/oxide precipitates interface.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 50 (11), 2656-2663, 2009

  公益社団法人 日本金属学会

キーワード

• steam oxidation
• internal oxidation
• external oxidation

詳細情報

• CRID: 1390282679226149632
• NII論文ID: 10025559216
• NII論文ID: 130004454130
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.m2009212
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 10418002
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10418002
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/50/11/50_M2009212/_pdf
• 本文言語コード: en
• データソース種別:
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  • NDL
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  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可