Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 28    No. 3    March 2018

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Structure and cavitation erosion behavior of HVOF sprayed multi-dimensional WC-10Co4Cr coating
Xiang DING1, Xu-dong CHENG1, Xiang YU2, Chao LI2, Cheng-qing YUAN2, Zhang-xiong DING2

1. State Key Laboratory of Advanced Technology for Materials and Processing, Wuhan University of Technology, Wuhan 430070, China; 2. School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China

Abstract:A new kind of multi-dimensional WC-10Co4Cr coating which is composed of nano, submicron, micron WC grains and CoCr alloy, was developed by high velocity oxy-fuel (HVOF) spraying. Porosity, microhardness, fracture toughness and cavitation erosion resistance of the multi-dimensional coating were investigated in comparison with the bimodal and nanostructured WC-10Co4Cr coatings. Moreover, the cavitation erosion behavior and mechanism of the multi-dimensional coating were explored. Results show that HVOF sprayed multi-dimensional WC-10Co4Cr coating possesses low porosity (≤0.32%) and high fracture toughness without obvious nano WC decarburization during spraying. Furthermore, it is discovered that the multi-dimensional WC-10Co4Cr coating exhibits the best cavitation erosion resistance which is enhanced by approximately 28% and 34%, respectively, compared with the nanostructured and bimodal coatings in fresh water. The superior cavitation resistance of multi-dimensional WC-10Co4Cr coating may originate from the unique micro-nano structure and excellent properties, which can effectively obstruct the formation and propagation of cavitation erosion cracks.

 

Key words: WC-10Co4Cr; cavitation erosion; multi-dimensional coating; high velocity oxy-fuel (HVOF) spraying; microstructure

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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