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Characterization of Mechanically Alloyed Powders for High-Cr Oxide Dispersion Strengthened Ferritic Steel

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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
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)

Submitter: 鵜飼 重治

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