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

  • Hideo Mano (a1) (a2), Kondo Satoru (a1), Akihito Matsumuro (a2) and Toru Imura (a3)

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%.

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References

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1. Liu, G., Wang, S.C., Lou, X.F., Lu, J. and Lu, K., Script Mater. 44, 17911795(2001).
2. Umemoto, M., Haung, B., Tsuchiya, K. and Suzuki, N., Script Mater. 46, 383388(2002).
3. Tao, N.R., Wang, Z.B., Tong, W.P., Sui, M.L., Liu, J. and Lu, K., Acta Mater. 50, 46034616(2002).
4. Umemoto, M., Liu, Z.G., Xu, Y. and Tsuchiya, K., Materials Science Forum, 386–388, 323330(2002).
5. Tsuji, N., Ueji, R., Minamino, Y. and Saito, Y., Scrip.Mater. 46, 305310(2002).

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

  • Hideo Mano (a1) (a2), Kondo Satoru (a1), Akihito Matsumuro (a2) and Toru Imura (a3)

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