MIMプロセスによる4600鋼の疲労特性に及ぼす均質および不均質組織の影響 Effects of Homogeneous and Heterogeneous Microstructures on the Fatigue Properties of 4600 Steels Produced by MIM Process

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The homogeneous microstructure has been utilized preferably for the P/M materials such as machine structural parts required high strength. For the low alloy steels such as AIS14600 produced by Metal Injection Molding (MIM) process, however, the static fracture strength such as tensile strength of mixed elemental powder compacts which showed the fine heterogeneous microstructure was superior to that of homogeneous prealloyed powder compacts in our previous studies. Therefore, the effect of microstructure on the dynamic fracture strength such as fatigue strength of injection molded 4600 steels by MIM process using prealloyed and mixed elemental powders were investigated in this study.<BR>The heat treated compacts using prealloyed powder showed the fine homogeneous tempered martensitic microstructure. On the other hand, the mixed elemental powder compacts heat treated showed the fine heterogeneous microstructure, which consisted of tempered martensitic matrix and retained martensite or austenite phases caused by the segregation of Ni added alloying element. The fatigue strength of the latter were about 100MPa higher than that of the former. Thus the fine heterogeneous microstructure seemed to contribute to improve not only the static but also the dynamic fracture strength. This result indicated that the MIM technique is more effective route for manufacturing high performance low alloy steel compacts using mixed elemental powder.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 44(5), 443-447, 1997-05-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002013813
  • 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
    4205764
  • 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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