Ultra Grain Refining and Decomposition of Oxide during Super-heavy Deformation in Oxide Dispersion Ferritic Stainless Steel Powder
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概要
- 論文の詳細を見る
Mechanical milling using a high energy planetary ball mill was applied to the powder mixtures of iron, chromium and yttria (Y2O3) (Fe-24mass%Cr-0-15mass%Y2O3) to introduce a very large strain into the iron-base matrix, and microstructural changes during mechanical milling were investigated in relation to decomposition behavior of Y2O3 particles. Mechanical milling of more than 36 ks was long enough to allow the mechanical alloying of iron and chromium powders. After the milling of 36 ks, ultrafine bcc crystalline grains of 10 to 20 nm were formed within Fe-24mass%Cr-15 mass%Y2O3 powder mixture and 15 mass% of Y2O3 particles were almost decomposed. The resultant powder mixture markedly hardened to about 1000 Hv. The decomposition of Y2O3 particles can be explained as being due to the formation of an amorphous grain boundary layer where yttrium and oxygen atoms are enriched. As a result, it is proposed that, for the dissolution of Y2O3, bcc crystalline grains should be refined to a nanometric size to provide a sufficient volume fraction of the grain boundary layer, and that Y2O3 particles should be crushed to several nanometers to produce the driving force for the decomposition of Y2O3 particles.
- 社団法人 日本鉄鋼協会の論文
- 1999-02-15
著者
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Kimura Y
Kyushu Univ. Fukuoka‐ken Jpn
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Kimura Yuuji
Structural Metals Center National Institute Of Materials Science
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Kimura Yuuji
Department Of Materials Science And Engineering Kyushu University
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Kimura Yuuji
Materials Engineering Group Department Of Materials Physics And Chemistry Graduate School Of Enginee
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Takaki Setsuo
Material Engineering Group Graduate School Of Engineering Kyushu University
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Kimura Yuuji
Structural Metals Center National Institute For Materials Science
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SUEJIMA Shinichi
Materials Engineering Group, Department of Materials Physics and Chemistry, Graduate School of Engin
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UEMORI Ryuji
Materials Engineering Group, Department of Materials Physics and Chemistry, Graduate School of Engin
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TAMEHIRO Hiroshi
Materials Engineering Group, Department of Materials Physics and Chemistry, Graduate School of Engin
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Tamehiro H
Chiba Inst. Of Technol. Chiba Jpn
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Uemori Ryuji
Materials Engineering Group Department Of Materials Physics And Chemistry Graduate School Of Enginee
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Suejima Shinichi
Materials Engineering Group Department Of Materials Physics And Chemistry Graduate School Of Enginee
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Takaki Setsuo
Materials Engineering Group Department Of Materials Physics And Chemistry Graduate School Of Enginee
関連論文
- Microstructure and Mechanical Properties in Ultra Fine-grained Oxide-dispersion Ferritic Stainless Steel
- Regularities of Deformation Microstructures in Ferritic Stainless Steels during Large Strain Cold Working
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- Effect of Nano-Sized Oxides on Annealing Behaviour of Ultrafine Grained Steels
- Delamination Toughening of Ultrafine Grain Structure Steels Processed through Tempforming at Elevated Temperatures
- Crystallographic Texture of Warm Caliber-rolled Low Carbon Steel
- Work-Hardening Mechanism during Super-Heavy Plastic Deformation in Mechanically Milled Iron Powder
- Phase Transformation Mechanism of Fe-Cu Alloys
- Enhancement of Impact Toughness of 0.05% P Doped High Strength Steel through Formation of an Ultrafine Elongated Grain Structure
- Ultra Grain Refining and Decomposition of Oxide during Super-heavy Deformation in Oxide Dispersion Ferritic Stainless Steel Powder
- Ultra Grain Refining of Iron Using Mechanical Milling Technique (特集 超微細結晶粒材料の作成と物性)