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 Microstructure Control of Fe-25mass%Cr-(1.5-1.8)mass%C Alloys by Mechanical Alloying

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著者

    • 木村 勇次 KIMURA Yuuji
    • 九州大学大学院工学研究科材料工学教室 Materials Engineering Group, Graduate School of Engineering, Kyushu University
    • 高木 節雄 TAKAKI Setsuo
    • 九州大学大学院工学研究科材料工学教室 Materials Engineering Group, Graduate School of Engineering, Kyushu University
    • 後藤 秀人 GOTO Hideto
    • 九州大学大学院工学研究科材料工学教室 Materials Engineering Group, Graduate School of Engineering, Kyushu University

抄録

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, M<SUB>23</SUB>C<SUB>6</SUB> carbide finely precipitates during heating to the consolidation temperature, and this results in the formation of microduplex structure of (αFe+M<SUB>23</SUB>C<SUB>6</SUB>). 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.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 45(3), 283-288, 1998-03-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002015282
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    4447658
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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