Experimental Analysis on the Fatigue Threshold Behaviour of a Nitrided and Shot Peened Steel

Abstract:

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The effectiveness of the application of shot peening after nitirding for improving the fatigue strength of high-performance steel components has not been adequately treated in literature, and it is not clear if shot peening can really and drastically increase mechanical performances of nitirded elements. In this paper an approach to assess the influence of shot peening on nitrided components is presented. It is based on fracture mechanics concepts. Smooth specimens with a micro-hole acting as a pre-crack were fatigue tested. The values of micro-hardness and of the residual stresses were measured and related to the experimental results. By elaborating the results it was possible to determine the threshold values of the stress intensity factors of the nitrided and shot peened material. A formula to predict the value of Kth of shot peened and nitrided steels is proposed.

Info:

Periodical:

Key Engineering Materials (Volumes 348-349)

Edited by:

J. Alfaiate, M.H. Aliabadi, M. Guagliano and L. Susmel

Pages:

865-868

DOI:

10.4028/www.scientific.net/KEM.348-349.865

Citation:

M. Guagliano "Experimental Analysis on the Fatigue Threshold Behaviour of a Nitrided and Shot Peened Steel", Key Engineering Materials, Vols. 348-349, pp. 865-868, 2007

Online since:

September 2007

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$35.00

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