Post-processing of selective laser melting manufactured SS-304L by laser shock peening
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T(2022)
摘要
This paper investigates the post-processing of additively manufactured stainless steel (SS) 304 L samples through laser shock peening (LSP). Four samples, differently processed, (i) as-built (AB); (ii) as-built + annealed; (iii) as-built + polished; and (iv) asbuilt + annealed + polished, were used to study the effect of LSP at pre-identified parameters to understand the mechanism and behavior of processing different conditions. In addition, compressive residual stresses and surface morphology were considered as a response to measure the effects of LSP on processed samples. The results have shown significant improvements in compressive residual stresses where the values have changed from initial tensile to compressive (-1170 MPa) and remain compressive up to the depth of 1 mm in most cases. The results of this research help better understand the LSP mechanism in the post-processing of AM Parts. (c) 2022 The Author(s). Published by Elsevier B.V.
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关键词
Additive manufacturing, Residual stresses, Laser shock peening, Microstructure
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