TY - JOUR
T1 - Microstructure and cavitation erosion behavior of WC-Co-Cr coating on 1Cr18Ni9Ti stainless steel by HVOF thermal spraying
AU - Wu, Yuping
AU - Hong, Sheng
AU - Zhang, Jianfeng
AU - He, Zhihua
AU - Guo, Wenmin
AU - Wang, Qian
AU - Li, Gaiye
N1 - Funding Information:
The research was supported by the Innovation Foundation of Hohai University, China Postdoctoral Science Foundation (No. 20100471371 ) and the Fundamental Research Funds for the Central Universities (No. 2009B16314 ).
PY - 2012/5
Y1 - 2012/5
N2 - A WC-Co-Cr coating was deposited by a high velocity oxy-fuel thermal spray (HVOF) onto a 1Cr18Ni9Ti stainless steel substrate to increase its cavitation erosion resistance. After the HVOF process, it was revealed that the amorphous phase, nanocrystalline grains (Co-Cr) and several kinds of carbides, including Co 3W 3C, Co 6W 6C, WC, Cr 23C 6, and Cr 3C 2 were present in the coating. The hardness of the coating was improved to be 11.3 GPa, about 6 times higher than that of the stainless steel substrate, 1.8 GPa. Due to the presence of those new phases in the as-sprayed coating and its higher hardness, the cavitation erosion mass loss eroded for 30 h was only 64% that of the stainless steel substrate. The microstructural analysis of the coating after the cavitation erosion tests indicated that most of the corruptions took place at the interface between the un-melted or half-melted particles and the matrix (Co-Cr), the edge of the pores in the coating, and the boundary of the twin and the grain in the stainless steel 1Cr18Ni9Ti.
AB - A WC-Co-Cr coating was deposited by a high velocity oxy-fuel thermal spray (HVOF) onto a 1Cr18Ni9Ti stainless steel substrate to increase its cavitation erosion resistance. After the HVOF process, it was revealed that the amorphous phase, nanocrystalline grains (Co-Cr) and several kinds of carbides, including Co 3W 3C, Co 6W 6C, WC, Cr 23C 6, and Cr 3C 2 were present in the coating. The hardness of the coating was improved to be 11.3 GPa, about 6 times higher than that of the stainless steel substrate, 1.8 GPa. Due to the presence of those new phases in the as-sprayed coating and its higher hardness, the cavitation erosion mass loss eroded for 30 h was only 64% that of the stainless steel substrate. The microstructural analysis of the coating after the cavitation erosion tests indicated that most of the corruptions took place at the interface between the un-melted or half-melted particles and the matrix (Co-Cr), the edge of the pores in the coating, and the boundary of the twin and the grain in the stainless steel 1Cr18Ni9Ti.
KW - Cavitation erosion
KW - HVOF thermal spray
KW - WC-Co-Cr coating
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U2 - 10.1016/j.ijrmhm.2012.01.002
DO - 10.1016/j.ijrmhm.2012.01.002
M3 - Article
AN - SCOPUS:84862789545
VL - 32
SP - 21
EP - 26
JO - International Journal of Refractory Metals and Hard Materials
JF - International Journal of Refractory Metals and Hard Materials
SN - 0958-0611
ER -