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Formation of Nanocrystalline Structure in Steels by Air Blast Shot Peening and Particle Impact Processing

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Abstract:

Surface nanocrystallization in various steels by shot peening (both air blast and ultrasonic) and particle impact processing was investigated. Nanocrystalline layers with several µm thick were successfully fabricated by these methods. In all the case, the nanocrystalline layers have extremely high hardness and separated from adjacent deformed structure regions with sharp boundaries. By annealing, the nanocrystalline layers showed substantially slow grain growth without recrystallization. Those characteristics are similar to those observed in the samples experienced ball milling and ball drop deformation.

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Periodical:

Materials Science Forum (Volumes 449-452)

Pages:

1149-1152

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.449-452.1149

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Online since:

March 2004

Authors:

Yoshikazu Todaka, Minoru Umemoto, Yu Watanabe, Koichi Tsuchiya

Keywords:

Nanostructure, Particle Impact Processing, Severe Plastic Deformation (SPD), Shot Peening, Steel

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© 2004 Trans Tech Publications Ltd. All Rights Reserved

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