Abstract No.:
3712

 Scheduled at:
Friday, May 23, 2014, Hall H2 3:20 PM
Cold Gas Spraying 4


 Title:
Annealing treatment on the microstructure and properties of cold sprayed FeAl-40%WC composite coating

 Authors:
Hongtao Wang* / Jiangxi Engineering Research Center for Materials Surface Remanufacturing School of Mechanical and Materials Engineering Jiujiang University, Jiujiang, Jiangxi, P.R.China
Xiao Chen / Jiujiang University, P.R.China
Xiao-Bo Bai/ Jiujiang University, P.R.China
Zeng-Xiang Dong/ Jiujiang University, P.R.China
Gang-Chang Ji/ Jiujiang University, P.R.China

 Abstract:
FeAl intermetallic compound has been investigated because of its low cost and density, high specific strength, environmental friendliness and excellent oxidation and corrosion resistance under oxidizing and sulfidizing atmospheres. However, the strength of FeAl decreased above 873 K and thus the advantages it offered in terms of corrosion resistance have not been fully exploited. In order to improve the high-temperature strength of intermetallic alloys, ceramic particles such as WC, TiC and Al2O3 have be introduced into the matrix. In this paper, 40vol%WC-Fe(Al) solid solution composite powder was prepared by mechanical alloying of WC/Fe/Al powder blends and 40vol%WC-FeAl intermetallic matrix coating was successfully fabricated by cold spraying of ball-milled composite powder and assisted by post spraying annealing treatment. The effect of annealing treatment on the microstructure evolution and properties such as microhardness and fracture toughness were investigated by scan electron microscopy (SEM), X-ray diffraction (XRD) and microhardness instrument. The results showed that the microstructure of FeAl-WC composite coating was improved with increasing annealing temperature and the diffusion between composite coating and stainless steel substrate occurred when over 950oC. As a result, a diffusion layer about 100¼m was found in the substrate and WC particles in the composite coating near substrate appeared growth. In addition, the microhardness of FeAl-40%WC composite coating kept unstable below 850oC and gradually decreased over it. However, the FeAl-40%WC had a relatively high microhardness about 850HV0.3 even after annealing treatment at 1100 oC for 5 hours.

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