Work-Hardening Mechanism during Super-Heavy Plastic Deformation in Mechanical Milled Iron Powder

DOI Web Site Web Site 被引用文献18件 参考文献41件
  • Kimura Yuuji
    Department of Materials Science and Engineering, Kyushu University
  • Hidaka Hideyuki
    Department of Materials Science and Engineering, Kyushu University
  • Takaki Setsuo
    Department of Materials Science and Engineering, Kyushu University

書誌事項

タイトル別名
  • Work-Hardening Mechanism during Super-Heavy Plastic Deformation in Mechanically Milled Iron Powder

この論文をさがす

抄録

Mechanical milling using a high energy ball mill was applied to a commercial pure iron powder to introduce a large deformation strain into the matrix. Microstructural changes during deformation and annealing were investigated for the mechanically milled powder, by means of X-ray diffractometry, transmission electron microscopy and hardness testing, in order to clarify the work-hardening mechanism of iron during super-heavy plastic deformation. Through the mechanical milling of 360 ks, nanocrystalline grains of 20–50 nm were formed within the powder, and the resultant powder was work-hardened to Hv950. Hardness of the mechanically milled powder mainly depends on the crystallite size(d); the size of dislocation cells, subgrains and nanocrystalline grains. In the mechanically milled powder, a linear relationship was confirmed between hardness and the reciprocal of crystallite size (d−1), supporting the strain hardening to Hv500. While it was also confirmed that the work-hardening mechanism of iron gradually changes from strain hardening to grain refining strengthening in the hardness range of around Hv600, where crystalline grains are refined less than 100 nm through heavy deformation. In the hardness range above Hv600, the Hall-Petch relationship was realized to the crystalline grain size.

収録刊行物

被引用文献 (18)*注記

もっと見る

参考文献 (41)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ