厚板の高温酸化スケール性状に及ぼす加熱雰囲気中の O_2, H_2O 濃度の影響

概要

論文の詳細を見る
The effects of heating atmosphere on oxidation behaviour at high temperature of steels with various Si content(0.06∿0.4%Si), but constant in other elements, have been investigated. The results obtained are summarized as follows. Fayalite, Fe_2SiO_4, formed at the interface of scale/matrix affected the oxidation behaviour. Therefore, solid Fe_2SiO_4 formed at oxidation temperatures up to 1170℃, which was the eutectic point of Fe_2SiO_4 and FeO phase, raised heat resistance, but liquid phase of Fe_2SiO_4 at oxidation temperatures exceeding 1170℃ accelerated the oxidation. The change of oxidation behaviour occurred at the Si content between 0.1% and 0.2%. Increasing Si content in steel, Fe_2SiO_4 formed at the interface of scale/matrix increased gradually. When the whole interface was covered with Fe_2SiO_4, the oxidation behaviour should be affected by the change of diffusion rate on Fe^<++> ion from iron matrix to scale. H_2O and O_2 content in heating atmosphere promoted the oxidation of iron, but the effect of H_2O was much more than O_2. The mean diameter of pores in scale was in proportion to oxidation weight gain, and therefore Si content and oxidation condition affected on mean diameter of pores in scale through the oxidation weight gain.
社団法人日本鉄鋼協会の論文
1993-06-01