Experimental assessment and simulation of surface nanocrystallization by severe shot peening
Name
Acta Materialia v97 P105_preprint version.pdf
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1.54 MB
Format
Adobe PDF
Checksum (MD5)
c3db5e5cd5067b17495c2183bf6e5111
Author(s)
Guagliano, M.
Hassani Gangaraj, Mostafa
Cho, K. S.
Voigt, Hyon-Jee L.
Schuh, Christopher A.
Date Issued
July 2015
Journal
Acta Materialia
Publisher
Elsevier
Citation
Hassani-Gangaraj, S.M., K.S. Cho, H.-J.L. Voigt, M. Guagliano, and C.A. Schuh. “Experimental Assessment and Simulation of Surface Nanocrystallization by Severe Shot Peening.” Acta Materialia 97 (September 2015): 105–115.
Version
Author's final manuscript
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
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DOI of Published Version
https://doi.org/10.1016/j.actamat.2015.06.054
