微粒子ピーニングによるSCr420浸炭焼入れ鋼表面のナノ結晶化(相変態・材料組織) Surface Nonocrystallization of Carburized Steel JIS-SCr420 by Fine Particle Peening(Transformations and Microstructures)

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The fine particle peening process, which makes particles of several tens microns in diameter impact at high speed, has been adapted industrially to auto motive steel parts or tool steels because the fatigue property is superior to that of a conventional shot peening process. However, microstructural changes obtained from this process have not been fully understood. In this study, microstructural change of JIS-SCr420 carburized steel (HV 7.55 GPa) by the fine particle peening process was investigated comparing with cases of a conventional shot peening and of softer steels. In SEM observation of the carburized steel, although plastic flow was observed in the region from the surface to a depth about 2μm, nanocrystalline structure was not detected. TEM observation revealed that nanocrystalline layer with about 0.5μm in thickness was produced continuously along the surface. In softer steels which hardness below HV 3.72 GPa in this study, nanocrystalline structure was observed as the folded and layered deformation region, which existed locally and discontinuously along the surface. Morphological difference of these nanocrystalline structures is considered to result from surface deformation modes by particles impact. In softer steels, the convex part in considerable uneven surface formed by the impact is folded and imposed into interior region by the repeated impact and developed to nanocrystalline structure. In carburized steel, owing to absence of the considerable unevenness, throughout surface area deformed during the impact and nanocrystalline structure is developed homogeneously and continuously along the surface. In a conventional shot peening condition, nanocrystalline structures were not formed.

収録刊行物

  • 鐵と鋼 : 日本鐡鋼協會々誌

    鐵と鋼 : 日本鐡鋼協會々誌 92(5), 318-326, 2006-05-01

    社団法人日本鉄鋼協会

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各種コード

  • NII論文ID(NAID)
    110004718527
  • NII書誌ID(NCID)
    AN00151251
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    00211575
  • NDL 記事登録ID
    7953889
  • NDL 雑誌分類
    ZP42(科学技術--金属工学・鉱山工学--鉄鋼)
  • NDL 請求記号
    Z17-356
  • データ提供元
    CJP書誌  CJP引用  NDL  NII-ELS  J-STAGE 
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