メカニカルアロイング粉末から作製したFe-C系硬質合金の組織 Microstructures of Fe-C System Hard Alloys Produced from Mechanically Alloyed Powders

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著者

    • 木村 勇次 KIMURA Yuuji
    • 九州大学工学部材料工学科 Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University
    • 高木 節雄 TAKAKI Setsuo
    • 九州大学工学部材料工学科 Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University
    • 後藤 秀人 GOTO Hideto
    • 九州大学工学部材料工学科 Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University

抄録

Fe-C system hard alloys were produced from mechanically alloyed powders and their properties were examined by means of hardness testing and microstructural examinations. Mixtures of iron and graphite powders (Fe-2-6mass%C) were mechanically alloyed with vibration-ball-mill in Ar atmosphere. MA powders obtained were packed in stainless steel tubes and then sealed in vacuum after degassing at 873K. The stainless steel tubes were hot-rolled in the temperature range of 923K-1273K to consolidate MA powders. Bulk materials were subjected to isothermal annealing at 1273K, followed by water quenching. After the ball-milling of 360ks, extremely large deformation energy was stored within powder particles. This leads to the formation of ultra-fine α-Fe grain and very fine dispersion of graphite. On heating to a consolidation temperature, the reaction forming Fe<SUB>3</SUB>C takes place at around 600K. MA powders were completely densified to full density by hot-rolling at 1123K where the structure is of (Fe<SUB>3</SUB>C+γFe) two-phase, and this consolidation process does not accompany significiant coarsening of the microstructure. In a case of an Fe-6mass%C MA bulk material, the structure at room temperature is composed of 80vol% Fe<SUB>3</SUB>C and 20vol%α-Fe, so that hardness of a bulk material reaches to Hv900. But, Fe<SUB>3</SUB>C is not so stable at elavated temperatures that it easily decomposes to Fe and graphite after long annealing.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 43(5), 584-589, 1996-05-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002012124
  • 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
    3967165
  • 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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