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Surface topography evolution of Ni-based single crystal superalloy under laser shock: Formation of the nano-scale surface reliefs

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Abstract

The aim of the study was to investigate the effect of laser shock peening (LSP) on surface topography evolution of metallic targets. Samples manufactured by a Ni-based single crystal superalloy with polished finish were treated by LSP, and the surface topographies before and after LSP were examined by non-contact White-Light Interferometer (WLI). Results showed the following three aspects: (a) By taking advantage of WLI, the shrinkage porosities and the interdendritic structures were observed simultaneously. (b) With the increasing impact times, the round pit induced by laser shock became deeper. (c) The nano-scale surface reliefs were found on the bottom of round pit induced by LSP, and the specific plastic flow of metallic materials under the action of compressive stresses was deemed as the primary contributor to the formation of surface reliefs. It revealed a novel microscale plastic deformation phenomenon of metallic materials in surface strengthening.

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Acknowledgements

This work was partly supported by the High Technology Research and Development Program of China (No. 2014AA041701) and the National Natural Science Foundation of China (NSFC) under Grant Nos. 51171179, 51271174, 51331005, and 11332010. In addition, the authors thank S. Guan and Z.W. Shi for valuable advices, and thank S. Gao for manufacturing of samples.

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Authors and Affiliations

  1. Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, China

    G. X. Lu, J. D. Liu, Y. Z. Zhou, T. Jin, X. F. Sun & Z. Q. Hu

  2. Shenyang Institute of Automation, Chinese Academy of Sciences, 114 Nanta Road, Shenyang, 110016, China

    H. C. Qiao

  3. University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100049, China

    G. X. Lu

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  1. G. X. Lu
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Correspondence to J. D. Liu.

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Deceased: Z. Q. Hu.

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Lu, G.X., Liu, J.D., Qiao, H.C. et al. Surface topography evolution of Ni-based single crystal superalloy under laser shock: Formation of the nano-scale surface reliefs. Appl. Phys. A 123, 213 (2017). https://doi.org/10.1007/s00339-017-0814-8

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  • DOI: https://doi.org/10.1007/s00339-017-0814-8

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