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Characterization of Mechanically Alloyed Powders for High-Cr Oxide Dispersion Strengthened Ferritic Steel
Title: | Characterization of Mechanically Alloyed Powders for High-Cr Oxide Dispersion Strengthened Ferritic Steel |
Authors: | Iwata, Noriyuki Y. Browse this author | Kasada, Ryuta Browse this author | Kimura, Akihiko Browse this author | Okuda, Takanari Browse this author | Inoue, Masaki Browse this author | Abe, Fujio Browse this author | Ukai, Shigeharu Browse this author →KAKEN DB | Ohnuki, Somei Browse this author | Fujisawa, Toshiharu Browse this author |
Keywords: | mechanical alloying | ODS ferritic steel powder | milling time | milling environment |
Issue Date: | 15-Dec-2009 |
Publisher: | Iron and Steel Institute of Japan |
Journal Title: | ISIJ International |
Volume: | 49 |
Issue: | 12 |
Start Page: | 1914 |
End Page: | 1919 |
Publisher DOI: | 10.2355/isijinternational.49.1914 |
Abstract: | High-Cr oxide dispersion strengthened (ODS) ferritic steel powders with the nominal composition of Fe–16Cr–4Al–0.1Ti–0.35Y2O3 in wt% were produced by milling of elemental powders and Y2O3 particles in argon atmosphere to investigate changes in the particle properties during mechanical alloying (MA). SEM observation and PSD analysis revealed that the MA powders milled for different times were composed of agglomerated particles having multimodal distributions with substantial size variation ranging from several μm to 350 μm. The mean size of particles rapidly increased at the initial stage of MA, then gradually decreased to 22 μm with increasing milling time up to 48 h, and kept constant thereafter. During milling of the Fe–16Cr–4Al–0.1Ti–0.35Y2O3 powder, MA within 6 h had mainly taken place between Fe and Al to form a bcc-Fe(Al) solid solution. The lattice constant of bcc-Fe steadily increased with a drastic increase in the solute concentrations of Cr, Al, and Ti in Fe. Alloying between Fe and alloying elements is almost fulfilled after milling for 48 h. The MA powder milled in air was much smaller than that milled in gaseous argon under the same conditions. Milling in an air atmosphere is effective to reduce the particle size of the ODS ferritic steel powder, although the pickup of oxygen from environment causes too high excess oxygen content. |
Rights: | 著作権は日本鉄鋼協会にある |
Type: | article |
URI: | http://hdl.handle.net/2115/76321 |
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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Submitter: 鵜飼 重治
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