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Coarsening Behavior of Ni(Fe) Particles in the Inner Oxide Layer Formed on Fe-5 mass%Ni Alloy at 1200 degrees C in N(2)Atmosphere
| Title: | Coarsening Behavior of Ni(Fe) Particles in the Inner Oxide Layer Formed on Fe-5 mass%Ni Alloy at 1200 degrees C in N(2)Atmosphere |
| Authors: | Harashima, Aya Browse this author | | Kondo, Yasumitsu Browse this author | | Hayashi, Shigenari Browse this author →KAKEN DB |
| Keywords: | Fe-Ni alloy | | oxide scale | | inner layer | | Ni(Fe) particles | | oxygen potential | | Ostwald ripening |
| Issue Date: | 15-Mar-2022 |
| Publisher: | 一般社団法人 日本鉄鋼協会 (The Iron and Steel Institute of Japan) |
| Journal Title: | ISIJ international |
| Volume: | 62 |
| Issue: | 3 |
| Start Page: | 561 |
| End Page: | 567 |
| Publisher DOI: | 10.2355/isijinternational.ISIJINT-2021-192 |
| Abstract: | In our previous study, we investigated the high-temperature oxidation behavior of Fe-5 mass%Ni alloy and discussed the changes in the microstructure of the inner layer, particularly the size and distribution of Ni(Fe) particles, with oxidation time. The number density and area fraction of Ni(Fe) particles in the inner layer decreased, whereas the size of the particles increased with oxidation time. This coarsening was proposed to arise from Ostwald ripening. However, this evaluation of the coarsening of Ni(Fe) particles includes the effect of oxygen potential in the oxide scale. In this study, for minimizing the effect of the oxygen potential gradient in the oxide scale on the coarsening of Ni(Fe) particles, the samples oxidized at 1 200 degrees C were subsequently held in pure N-2 with low oxygen potential to decrease the oxygen potential gradient across the oxide scale, and the microstructural changes in the inner layer during heat treatment in N-2 were investigated to confirm the coarsening of Ni(Fe) particles by Ostwald ripening, with a minimal effect of the change in the oxygen potential on the microstructural evolution. After the equilibrium condition was established in N-2 with lower oxygen potential in the inner layer, the coarsening behavior of Ni(Fe) particles followed the relationship explained by Ostwald ripening. Ni(Fe) particles precipitated in the outer and inner layers because of a decrease in the oxygen potential. The precipitation of Ni(Fe) particles in the inner layer occurred only in the initial transient stage of heat treatment, until the equilibrium condition in N-2 was established. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/85272 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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