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Journal of Materials Science

, Volume 42, Issue 18, pp 7716–7720 | Cite as

Formation of a nanocrystalline surface layer on steels by air blast shot peening

  • J. L. LiuEmail author
  • M. Umemoto
  • Y. Todaka
  • K. Tsuchiya
Article

Abstract

A nanostructured surface layer was fabricated on two kinds of steels by means of air blast shot peening. The nanolayer shows a sharp boundary to the underlying work-hardened area and good thermal stability up to 873 K. It has much higher hardness than the work hardened region in both the as-treated and annealed states. When using small shot sizes, the nano area can be formed in very short treatment times, and the thickness and continuity of the nanolayer is enhanced. On the contrary, the nanocrystalline region is more difficult to synthesize when using large shot particles, even though the deformed area is much thicker. The effect of particle diameter is attributed to the different collision time and different strain rate of the treated materials.

Keywords

Good Thermal Stability High Pressure Torsion Shot Peening Deformation Layer Plain Surface 

Notes

Acknowledgement

Present study is partly supported by the grant-in-aid by the Japan Society for the Promotion of Science. (No.1420513)

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • J. L. Liu
    • 1
    Email author
  • M. Umemoto
    • 2
  • Y. Todaka
    • 2
  • K. Tsuchiya
    • 2
  1. 1.Superalloy Division, Institute of Metal ResearchChinese Academy of SciencesShenyangChina
  2. 2.Department of Production Systems EngineeringToyohashi University of TechnologyToyohashiJapan

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