Research and Reports on Metals

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Surface Nanostructuring of AISI 1017 by Severe Shot Peening

In this study, AISI 1017 low carbon steel was subjected to severe shot peening (SSP) by using 35mmA Almen intensity. SSP led to surface severe plastic deformation by the impingement of the shot media with very high air pressure. 40-50 µm highly deformed nanograin layer was formed right below the surface by means of sub grain creation with dislocation interaction and non-homogenous strain. Nanoindentation tests were performed to detect the hardness and reduced modulus of fine grained layer and the results reveal the hardness increased up to almost 1,5 times with compared to core. The reduced modulus is also influenced from very hard nanocrystalline layer.

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