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Characterization of nanocrystalline surface layer induced by shot peening and effect on their fatigue strength.

Published online by Cambridge University Press:  01 February 2011

Hideo Mano ,
Kondo Satoru ,
Akihito Matsumuro  and
Toru Imura
Hideo Mano
Affiliation:
TOGO SEISAKUSYO CORPORATION, Aichi-gun, Aichi, Japan Nagoya university, Nagoya-shi, Aichi, Japan
Kondo Satoru
Affiliation:
TOGO SEISAKUSYO CORPORATION, Aichi-gun, Aichi, Japan
Akihito Matsumuro
Affiliation:
Nagoya university, Nagoya-shi, Aichi, Japan
Toru Imura
Affiliation:
Aichi institute of technology, Toyota-shi, Aichi, Japan
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Abstract

The shot peening process is known to produce a hard layer, known as the white layer” on the surface of coil springs. However, little is known about the fatigue properties of this white-layer.

In this study, coil springs with a white-layer were manufactured. The surface of these springs was then examined using micro Vickers hardness, FE-SEM etc. to test fatigue strength of the springs.

From the results obtained, a microstructure of the white-layer with grain size of 50–100 nm was observed, with a Vickers hardness rating of 8–10 GPa.

Tow category springs were manufactured utilizing a double-peening process. These springs had the same residual stress destruction and surface roughness. Only one difference was observed: one spring had a nanocrystalline layer on the surface, while the other did not. The results of the fatigue test realized an increase in the fatigue life of the nanocrystalline surface layer by 9%.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 843: Symposium T – Surface Engineering-Fundamentals and Applications , 2004 , T3.7
Copyright
Copyright © Materials Research Society 2005

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References

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