Microstructures and Mechanical Properties in Ultra Fine-grained Oxide-dispersion Ferritic Stainless Steels.
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- Kimura Yuuji
- Department of Materials Science and Engineering, Kyushu University
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- Suejima Shinichi
- Graduate Student, Kyushu University
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- Goto Hideto
- Department of Materials Science and Engineering, Kyushu University
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- Takaki Setsuo
- Department of Materials Science and Engineering, Kyushu University
抄録
Microstructures and mechanical properties were investigated in ultra fine-grained oxide-dispersion steels with 24 mass% Cr ferrite matrix fabricated from mechanical milled powders. Powder mixtures of Fe, Cr and Y2O3 were mechanically milled in an argon gas atmosphere and then consolidated at around 1100K. After 720 ks mechanical milling (MM), nanocrystalline ferrite grain structures were formed within powder particles. As for Y2O3 particles. It was observed that they were not only crushed to several nanometers but also decomposed during MM, and then oxides like Y2O3 and YCrO3 finely precipitated in ultra fine grained structure on annealing at around 1200K. Such ultra fine oxide particles effectively retarded the growth of matrix grains. The sample with 1 vol.% Y2O3 addition maintained ultra fine ferrite grains of 0.4 μm even after the annealing of 1573 K-3.6 ks by the Zener pinning effect of the oxide particles of about 10 nm in diameter. Tensile strength of the bulk samples markedly rose as the ferrite grain size became smaller in the grain size range below 1 μm and reached 1.93 GPa for the bulk sample with 1 vol.% Y2O3 addition and with the smallest mean grain size of 0.16 μm.
収録刊行物
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- ISIJ International
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ISIJ International 40 (Suppl), S174-S178, 2000
一般社団法人 日本鉄鋼協会
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詳細情報 詳細情報について
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- CRID
- 1390001206451044480
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- NII論文ID
- 130000780299
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- ISSN
- 13475460
- 09151559
- http://id.crossref.org/issn/09151559
- http://id.crossref.org/issn/00211583
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可