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

Published online by Cambridge University Press:  23 February 2015

Haoping Peng
Affiliation:
Jiangsu Key Laboratory of Oil and Gas Storage and Transportation Technology, Changzhou University, Jiangsu 213164, People's Republic of China
Ruidi Li*
Affiliation:
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, People's Republic of China; and State Key Laboratory of Materials Processing and Die & Mould, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
Tiechui Yuan
Affiliation:
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, People's Republic of China
Hong Wu
Affiliation:
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, People's Republic of China
Hua Yan
Affiliation:
School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, People's Republic of China
*
a)Address all correspondence to this author. e-mail: liruidi@csu.edu.cn
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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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Articles
Copyright
Copyright © Materials Research Society 2015 

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References

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