Analyzing The Near-surface Deformation Gradients Due To Shot Peening And Ball-burnishing Of Alpha Brass And Stainless Steel

Author:  S. Yi, M. Wollmann, T. Ludian and L. Wagner
Source:  Conf Proc: ICSP-10 Tokyo, Japan 2008
Doc ID:  2008062
Year of Publication:  2008
ABSTRACT The change in near-surface properties as induced by shot peening and ballburnishing was evaluated on an ..-brass CuZn30 and an austenitic stainless steel X5CrNi18-10 (AISI 304). The depth profiles of near-surface microstructures, microhardness and full width at half maximum (FWHM) of X-ray interference lines were determined. By comparing the induced changes in microstructure, microhardness and FWHM with materials being cold rolled to certain thickness reductions, the local deformation degrees in the mechanically surface treated materials could be estimated. The experimental results indicate that near surface deformation degrees in shot peened or ball-burnished surface layers are very high and can easily reach values corresponding to 80 % of thickness reduction or .. = 1.6 in terms of true strain. KEY WORDS Microhardness-depth profiles, FWHM-depth profiles, local deformation degrees

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