Microstructure Control of Fe-25mass%Cr-(1.5-1.8)mass%C Alloys by Mechanical Alloying.
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- Kimura Yuuji
- Materials Engineering Group, Graduate School of Engineering, Kyushu University
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- Takaki Setsuo
- Materials Engineering Group, Graduate School of Engineering, Kyushu University
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- Goto Hideto
- Materials Engineering Group, Graduate School of Engineering, Kyushu University
Bibliographic Information
- Other Title
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- メカニカルアロイングによるFe-25mass%Cr-(1.5-1.8)mass%C合金の組織制御
- メカニカル アロイング ニヨル Fe 25massパーセント Cr 1.5 1
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Abstract
Microstructures and mechanical properties were investigated for Fe-25mass%Cr-(1.5-1.8)mass%C alloys produced by mechanical alloying. Mixtures of iron, chromium and graphite powders were ball-milled in Ar atmosphere and then hot-pressed at 1273K in vacuum. Bulk materials obtained were subjected to annealing in temperature range of 873K-1473K, followed by air-cooling or water quenching. In Fe-25mass%Cr-(1.5-1.8)mass%C powder mixtures, nano-sized ferrite(αFe) grains are formed within powder particles after the ball-milling of 720ks. In powder with 720ks milling, M23C6 carbide finely precipitates during heating to the consolidation temperature, and this results in the formation of microduplex structure of (αFe+M23C6). Microstructure of the alloys are very sensitive to heat treatment conditions: Matrix is almost fully austenitic in annealing at around 1473K, while is martensitic in annealing at around 1273K. In the martensite structure formed in fine austenite grains of 1-2μm, it is characteristic that each prior austenite grain consists of only one set of laths with the same variant. The bending strength of MA bulk materials is much higher than that of materials produced by ingot-metallurgy process due to having the microduplex structures.
Journal
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- Journal of the Japan Society of Powder and Powder Metallurgy
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Journal of the Japan Society of Powder and Powder Metallurgy 45 (3), 283-288, 1998
Japan Society of Powder and Powder Metallurgy
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Keywords
Details 詳細情報について
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- CRID
- 1390001206309100928
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- NII Article ID
- 10002015282
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- NII Book ID
- AN00222724
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- ISSN
- 18809014
- 05328799
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- NDL BIB ID
- 4447658
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed