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Acta Metall Sin  2019, Vol. 55 Issue (4): 537-546    DOI: 10.11900/0412.1961.2018.00271
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Wear Behavior of Fe-WC/Metal Double Layer Coatings Fabricated by Resistance Seam Weld Method
Wenqin WANG1,2,Zhaoman WANG1,Yulong LI1,De WANG3(),Miao LI1,Qing CHEN1
1. School of Mechanical and Electrical Engineering, Nanchang University, Nanchang 330031, China
2. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
3. Institute of Applied Physics, Jiangxi Academy of Sciences, Nanchang 330029, China
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Fe-WC/metal double layer coatings containing Fe-C-Si super hard alloy (SHA) particles and tungsten carbide (WC) particles were fabricated on Al7075 substrates by resistance seam welding method to improve the wear resistance of aluminum alloys. The micro-structure and phase compositions of the Fe-WC/metal double layer coatings with different WC particle sizes (fine and coarse) were investigated by SEM and EPMA. Nano-hardness of different phases in the coatings were investigated by nano-indentation test. Finally, the friction behavior of the two kinds of Fe-WC /metal double layer coatings were contrasted by ball-on-disc test using WC and SUS 304 balls. The results show that the thicknesses of Fe-WC composite/metal double layer coatings were about 600 μm. The microstructure of the coatings was: WC/Fe composite (wear resistance layer)+Fe/Al composite (metal interlayer)+Al7075 substrate. When WC ball was used as the static counterpart, the wear mechanism of the coatings with fine and coarse WC particles were severe abrasive wear and brittle fracture with little abrasive wear, respectively. When SUS304 was used as the static counterpart, the coating with fine WC powder was demonstrated difficulty to be abraded due to the protection of the iron oxide adhesive layer, and the other proved a little brittle fracture. Moreover, the wear rate of both coatings using SUS304 ball was lower than that of WC ball in the ball-on-disc test.

Key words:  resistance seam welding      double layer coatings      wear behavior     
Received:  27 June 2018     
ZTFLH:  TG174  
Fund: National Natural Science Foundation of China(No.51765041);The Tribology Science Fund of State Key Laboratory of Tribology(No.5KLTLF17B07);Key Research and Development Project of Jiangxi Province(No.20171BBE50022)
Corresponding Authors:  De WANG     E-mail:

Cite this article: 

Wenqin WANG, Zhaoman WANG, Yulong LI, De WANG, Miao LI, Qing CHEN. Wear Behavior of Fe-WC/Metal Double Layer Coatings Fabricated by Resistance Seam Weld Method. Acta Metall Sin, 2019, 55(4): 537-546.

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Fig.1  Cross-sectional microstructures of the Fe-WC/metal double layer coatings (SHA—super hard alloy)(a, b) overview of the Coating-F and Coating-C, respectively(c, d) Fe-WC layer of the Coating-F and Coating-C, respectively(e, f) metal interlayer of the Coating-F and Coating-C, respectively
Fig.2  EPMA mappings of Fe-WC/metal double layer coatings(a) Fe-WC layer of the Coating-F (b) Fe-WC layer of the Coating-C (c) metal interlayer of the Coating-F (d) metal interlayer of the Coating-C
Fig.3  Results of microindentation test in metal interlayer of Coating F(a) testing positions (b) nano-hardness curve in different positions (c~e) indentations in points 1~3, respectively
Fig.5  Formation mechanism of Coating-F by resistance seam welding method
Fig.6  Worn surfaces of Coating-F (a~c) and Coating-C (d~f) against WC ball after BOD test(a, d) overview of surfaces (b, e) SHA surfaces (c, f) WC surfaces
Fig.7  Worn surfaces of Coating-F (a~c) and Coating-C (d~f) against SUS304 ball after BOD test(a, d) overview of surfaces (b, e) SHA surfaces (c, f) WC surfaces
Fig.8  EDS elemental mappings of worn surfaces of Coating-F (a) and Coating-C (b) against WC ball after BOD test
Fig.9  EDS elemental mappings of worn surfaces of Coating-F (a) and Coating-C (b) against SUS304 ball after BOD test
Fig.10  EDS elemental mappings of wear scar of WC ball sliding against coatings after BOD test(a) Coating-F (b) Coating-C
Fig.11  EDS elemental mappings of wear scar of SUS304 ball sliding against coatings(a) Coating-F (b) Coating-C (c) enlarged image of Coating-C
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