Comparison Of Peening Techniques On 304 Austenitic Stainless Steel

Author:  S Clitheroe, MTurski, A Evans, J Kelleher, D Hughe
Source:  Conf Proc: ICSP-10 Tokyo, Japan 2008
Doc ID:  2008044
Year of Publication:  2008
ABSTRACT This paper compares a range of peening techniques applied to 8 mm thick 304 austenitic stainless steel test samples. As new peening techniques become established, a range of peening techniques have become available for the engineer. This paper aims to compare two relatively new techniques, laser shock peening (LSP) and ultrasonic impact treatment (UIT), against more conventional shot peening (SP). This work has been carried out in context of mitigation against environmentally assisted cracking, where surface finish, levels of plastic work in addition to depth and magnitude of compressive residual stress are relevant. Residual strain depth profiles have been measured using neutron diffraction and are compared in relation to intensity and depth of compressive residual stress introduced into a 304 austenitic stainless steel sample. Initial results show significant differences in the depth of compressive residual strain for each peening approach. KEY WORDS Shot peening, laser shock peening, ultrasonic impact treatment, residual stress, Neutron diffraction.

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