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Published in: Journal of Materials Engineering and Performance 7/2016

26-05-2016

Effect of Decarburization on the Residual Stresses Produced by Shot Peening in Automotive Leaf Springs

Authors: Claudia E. Flores De la Rosa, Martin Herrera Trejo, Manuel Castro Román, Eddy Alfaro López

Published in: Journal of Materials Engineering and Performance | Issue 7/2016

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Abstract

The shot peening is used in the leaf springs manufacturing process for producing a compressive residual stress field (CRSF) at and near the surface that improves the fatigue resistance. The resulting CRSF is influenced by the surface ferrite thickness associated with the decarburization. Hence, this work aims to extend the knowledge on the influence of the decarburization on the CRSF for the given shot peening conditions. A study on the laboratory scale was conducted for an SAE 5160 steel grade used in the automotive industry. Next, specimens with different decarburization depths were treated using industrial shot peening, and the resulting CRSF was characterized. The CRSF was found to be influenced by the decarburization depth. It is assumed that the elastic deformation mechanism is predominant at low decarburization depths, followed by a zone in which both the elastic and plastic deformation have competing mechanisms that contribute to the CRSF, and at higher decarburization depths, the dominant mechanism is plastic deformation. The values for σsrs and σmcrs decrease as the decarburized depth increases, and suitable CRSFs were obtained below a decarburization depth of 120 µm in industrial leaves. Furthermore, the prediction based on expressions correlating the measured variables was good in these leaves.

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Metadata
Title
Effect of Decarburization on the Residual Stresses Produced by Shot Peening in Automotive Leaf Springs
Authors
Claudia E. Flores De la Rosa
Martin Herrera Trejo
Manuel Castro Román
Eddy Alfaro López
Publication date
26-05-2016
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 7/2016
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-016-2132-2

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