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Graphite Morphology's Influence on Shot Peening Results in Cast Irons
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology.
Base Engine & Materials Technology, Volvo Powertrain, Göteborg.
Testing Methods and Testing, Scania CV AB, Södertälje.
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2014 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The different shot peening responds of a grey cast iron (GI) with its flake graphite and a compacted cast iron (CGI) with its vermicular graphite was analyzed and compared in this paper. For peening using identical parameters, CGI showed a larger plastic deformation zone with higher subsurface compressive stresses than GI. Electron backscatter diffraction (EBSD) mapping and backscatter electron imaging revealed that plastic deformation of the matrix near graphite inclusions is affected by the size and geometry of the graphite. The different behaviors of graphite are explained by their capability to damp mechanical force but at the same time to cause stress concentration in the matrix. The better shot peening results for CGI may be attributed to a lower damping effect of its graphite inclusions and capability of the matrix for larger plastic deformation.

Place, publisher, year, edition, pages
Trans Tech Publications Inc., 2014. Vol. 768-769, 542-549 p.
Keyword [en]
shot peening, cast iron, graphite morphology, EBSD, residual stress
National Category
Engineering and Technology Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-89582DOI: 10.4028/www.scientific.net/MSF.768-769.542ISI: 000336693000071OAI: oai:DiVA.org:liu-89582DiVA: diva2:608341
Conference
International Conference on Residual Stresses 9 (ICRS 9), Garmisch-Partenkirchen, Germany, 7 – 9 October 2012
Available from: 2013-03-13 Created: 2013-02-27 Last updated: 2014-12-10Bibliographically approved

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