Experimental assessment and simulation of surface nanocrystallization by severe shot peening

[Display omitted] Surface nanocrystallization is an effective approach to bypass the difficulties of synthesizing bulk nanocrystalline material and yet exploit its unique advantages in service. This study uses air blast shot peening over a wide range of coverage (peening time), from conventional to...

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Bibliographic Details
Published in:Acta materialia 2015-09, Vol.97, p.105-115
Main Authors: Hassani-Gangaraj, S.M., Cho, K.S., Voigt, H.-J.L., Guagliano, M., Schuh, C.A.
Format: Article
Language:English
Subjects:
Assessments
Dislocation density
Finite element
Grain refinement
Mathematical models
Nanocrystals
Nanostructure
Peening
Resultants
Severe shot peening
Shot peening
Surface layer
Surface nanocrystallization
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Summary:[Display omitted] Surface nanocrystallization is an effective approach to bypass the difficulties of synthesizing bulk nanocrystalline material and yet exploit its unique advantages in service. This study uses air blast shot peening over a wide range of coverage (peening time), from conventional to severe, to generate nanostructured surface layers on high strength low alloy steel. Electron microscopy observations were carried out to systematically study the degree and the mechanism of grain refinement as the severity of deformation increases. A model linking finite element simulation of severe shot peening to dislocation density evolution due to the accumulated plastic strain was developed to predict the resultant grain/cell size gradient in the surface layers. The proposed framework establishes a physical connection from processing parameters such as media size, velocity and peening coverage to the resultant structure, opening the possibility of designing a severe surface peening process to achieve a desired nanostructure.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2015.06.054