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

• 高木 眞一

  神奈川県産業技術総合研究所材料技術部

• 熊谷 正夫

  神奈川県産業技術総合研究所材料技術部

• 伊藤 裕子

  (財)神奈川科学技術アカデミー高度計測センター

• 小沼 誠司

  (財)神奈川科学技術アカデミー高度計測センター

• 下平 英二

  (株)不二WPC

書誌事項

タイトル別名

• Surface Nonocrystallization of Carburized Steel JIS-SCr420 by Fine Particle Peening
• ビリュウシ ピーニング ニ ヨル SCr420 シンタン ヤキイレ コウ ヒョウメン ノ ナノ ケッショウカ
• Surface nanocrystallization of carburized steel JIS-SCr420 by fine particle peening

抄録

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.<BR>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 2 μm, nanocrystalline structure was not detected. TEM observation revealed that nanocrystalline layer with about 0.5 μm 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

• 鉄と鋼

  鉄と鋼 92 (5), 318-326, 2006

  一般社団法人 日本鉄鋼協会

キーワード

• nanostructure
• shot peening
• carburized steel
• recrystallization
• plastic deformation

詳細情報

• CRID: 1390282680160219264
• NII論文ID: 110004718527
• NII書誌ID: AN00151251
• DOI: 10.2355/tetsutohagane1955.92.5_318
• ISSN: 18832954
• ISSN: 00211575
• ISSN: http://id.crossref.org/issn/00211575
• NDL書誌ID: 7953889
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7953889
• Web Site: https://www.jstage.jst.go.jp/article/tetsutohagane1955/92/5/92_5_318/_pdf
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可