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Producing nanostructured Co–Cr–W alloy surface layer by laser cladding and friction stir processing

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Abstract

The laser cladding Co–Cr–W coating has coarse dendritic and network carbides, which can lead to crack and exfoliation easily, limiting the application of Co–Cr–W coating. In this work, friction stir processing (FSP) was carried out on a laser cladding Co–Cr–W alloy coating to modify its microstructure. FSP transforms the laser clad coarse dendritic grains (grain size: 2–4 μm) into nanograins (grain size: 50–200 nm) and crushes the network carbides into nanoparticles dispersed in Co-base solution. The microstructure and thickness of plastic surface layer are controllable by the condition of FSP. Moreover, a WCx reinforced Co–Cr–W thin layer was formed because the WC particles of stir tool were squeezed into the Co–Cr–W coating surface layer. More interestingly, when the FSP rotary speed was 1500 rpm, an interlocking bonding between Co–Cr–W coating and steel substrate was formed, which was favorable for the connection with substrate. The surface nanocrystallization significantly strengthened the laser clad Co–Cr–W alloy after FSP.

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ACKNOWLEDGMENTS

The authors wish to acknowledge the financial support of National Natural Science Foundation of China (51101126, 51301028, 51301205, 51405288), Open found of State Key Laboratory of Material Processing and Die & Mold Technology (P2014-07), Changzhou Scientific and Technological Projects (CJ20130034) and Pecialized Research Fund for the Doctoral Program of Higher Education of China (20130162120001).

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Authors and Affiliations

  1. Jiangsu Key Laboratory of Oil and Gas Storage and Transportation Technology, Changzhou University, Jiangsu, 213164, People’s Republic of China

    Haoping Peng

  2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, People’s Republic of China

    Ruidi Li, Tiechui Yuan & Hong Wu

  3. State Key Laboratory of Materials Processing and Die & Mould, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China

    Ruidi Li

  4. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai, 201620, People’s Republic of China

    Hua Yan

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  1. Haoping Peng
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  2. Ruidi Li
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  4. Hong Wu
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  5. Hua Yan
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Correspondence to Ruidi Li.

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Peng, H., Li, R., Yuan, T. et al. Producing nanostructured Co–Cr–W alloy surface layer by laser cladding and friction stir processing. Journal of Materials Research 30, 717–726 (2015). https://doi.org/10.1557/jmr.2015.28

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  • DOI: https://doi.org/10.1557/jmr.2015.28

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