Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 65, Issue -, Pages 64-70Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2013.08.022
Keywords
Fatigue; Severe shot peening; Surface nanocrystallization; Nodular cast iron
Funding
- Ministry of Science and Innovation of Spain [MAT2009-12308]
- FFTF Fellowship
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Effect of nanocrystalline surface obtained by severe plastic deformation on fatigue strength of nodular cast iron has been studied in the paper. Surface nanocrystallization has been applied by means of standard air blast shot peening equipment with particularly severe parameters compared to the usual ones used for similar classes of material. Microscopy observation, microhardness, surface roughness and X-ray diffraction measurements were carried out to characterize the treated surface of differently shot peened specimens. Rotating bending fatigue tests were performed to investigate the effects of process parameters on fatigue behaviour. The results indicate a sensible fatigue strength improvement obtained through application of severe shot peening with respect to conventional shot peening, notwithstanding the specimen's very high surface roughness due to high energy impacts. The obtained results are critically discussed. (C) 2013 Elsevier Ltd. All rights reserved.
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