Microstructure and wear behavior of laser cladding VC–Cr7C3 ceramic coating on steel substrate

► The VC–Cr7C3 coating on steel substrate was in situ produced by laser cladding. ► The distribution of VC–Cr7C3 phase decreased gradually from the top of the coating. ► The laser cladding achieved a high hardness of the order of 1000HV. ► The wear resistance of the coating was 4times that of the st...

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Bibliographic Details
Published in:Materials in engineering 2013-08, Vol.49, p.10-18
Main Authors: Wu, Qianlin, Li, Wenge, Zhong, Ning, Gang, Wu, Haishan, Wang
Format: Article
Language:English
Subjects:
Ceramic coatings
Coating
Coatings
In situ
Laser beam cladding
Laser cladding
Microstructure
Nanostructure
Protective coatings
Steels
Vanadium ceramics
Wear resistance
Wear tests
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Summary:► The VC–Cr7C3 coating on steel substrate was in situ produced by laser cladding. ► The distribution of VC–Cr7C3 phase decreased gradually from the top of the coating. ► The laser cladding achieved a high hardness of the order of 1000HV. ► The wear resistance of the coating was 4times that of the steel substrate. To enhance the wear resistance of mechanical components, laser cladding has been applied to deposit in situ VC–Cr7C3 ceramic coating on steel substrate using a pre-placed powder consisting of vanadium, carbon and high-carbon ferrochrome. The laser cladding samples were subjected to various microstructure examinations, microhardness and wear tests. The results showed that defect-free coating with metallurgical joint to the steel substrate was obtained. The quantity of VC–Cr7C3 particles gradually increased from the bottom to the top of the coating. The VC particles in nanometer were observed within the coating. Average hardness of the coating up to 1050HV was significantly higher than that of the substrate 150HV. Wear tests indicated the wear resistance of the clad coating was 4times that of the steel substrate.
ISSN:0261-3069
DOI:10.1016/j.matdes.2013.01.067