Shohei Nakakubo

Shohei Nakakubo; Mikako Takeda; Takashi Onishi

The boundary constants between internal and external oxidation of Si or Cr containing steels (Fe-Si alloys or Fe-Cr alloys) at 850°C were calculated in order to clarify the formation mechanism of fayalite scale (Fe2SiO4) or chromite scale (FeCr2O4), which can form as a “sub-scale” in Si or Cr containing steels. The diffusion coefficient of oxygen in the alloy, Do, and the oxygen concentration at the specimen surface, NO(s), which are constituents of the internal oxidation rate constant, (2DONO(s)/NB(O)n), were calculated for various oxidation conditions, and the rate equation for internal oxidation was derived. By comparing the calculated and measured values of (2DONO(s)/NB(O)n), we confirmed that the rate equation determined for internal oxidation was reasonable. The boundary condition between internal and external oxidation of Si or Cr containing steels (Fe-Si alloys or Fe-Cr alloys) at 850°C were also calculated by substituting the calculated values of DO and NO(s) into the rate equation.

Fumiaki Kobayashi; Yoshihiro Miyake; Shohei Nakakubo; Ryosuke Otomo; Mikako Takeda; Fumio Yuse; 義浩 三宅; 昌平 中久保; 亮介 大友; 史明 小林; 実佳子 武田; 文雄 湯瀬

Hirobumi Fujii; Yoshinori Kurokawa; Shohei Nakakubo; Kenji Yamamoto; 昌平 中久保; 兼司 山本; 博文 藤井; 好徳 黒川

Fumiaki Kobayashi; Yoshihiro Miyake; Shohei Nakakubo; Mikako Takeda; Fumio Yuse; 義浩 三宅; 昌平 中久保; 史明 小林; 実佳子 武田; 文雄 湯瀬

Mikako Takeda; Shohei Nakakubo; Takashi Onishi; Masumi Nishimura; Hidenori Sakai; Tomotada Maruo

Kenji Yamamoto; Shohei Nakakubo

Shohei Nakakubo; Mikako Takeda; Kazumi Yanagisawa; 昌平 中久保; 佳寿美 柳澤; 実佳子 武田

Shohei Nakakubo; Mikako Takeda; 昌平 中久保; 実佳子 武田

Shohei Nakakubo; Mikako Takeda; 昌平 中久保; 実佳子 武田

Tomoya Dobashi; Kazuhiko Kirihara; Shohei Nakakubo; Takashi Onishi; Hidenori Sakai; Go Shirano; Mikako Takeda; 昌平 中久保; 智也 土橋; 隆 大西; 和彦 桐原; 実佳子 武田; 剛 白野; 英典 酒井