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Title: Formation Of Surface Nanocrystalline Structure In Steels By Air Blast Shot Peening
Author: H. Saitoh, T. Ochi, M. Kubota
Source: Conf Proc: ICSP-10 Tokyo, Japan 2008
Publication year 2008
Document number: 2008115
Number of pages: 6
Abstract:
ABSTRACT The influences of steel hardness and shot peening (SP) conditions on the surface nanocrystalline layers produced by air blast SP was investigated with steels having
Vickers hardness ranging from 260HV to 710HV. It was found that the easiness to form a nanocrystalline structure is related to steel hardness and SP conditions. Considering
geometrically necessary (GN) dislocation density at surface of steel after SP, it can be said that the greater GN dislocation density at surface, the greater the amount of
nanocrystalline layers and there is a critical GN dislocation density to form a nanocrystalline structure. The experimental results seem to support the dynamic continuous
recrystallization mechanism rather than dynamic phase transformation mechanism.
KEY WORDS shot peening, nanocrystalline structure, steel, surface, dislocation
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