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Materials 2016, 9(10), 815; doi:10.3390/ma9100815

TiC Reinforcement Composite Coating Produced Using Graphite of the Cast Iron by Laser Cladding

School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
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Academic Editor: Javier Narciso
Received: 25 August 2016 / Revised: 26 September 2016 / Accepted: 26 September 2016 / Published: 30 September 2016
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Abstract

In this study, a TiC-reinforced composite coating was produced to improve the wear resistance of a pearlite matrix grey iron using a pre-placed Ti powder by laser cladding. Results of scanning electron microscopy (SEM), X-ray diffractometer (XRD), and energy dispersive X-ray spectroscopy (EDS) confirmed that the coating was composed of TiC particles and two kinds of α-Fe phase. The fine TiC particles were only a few microns in size and uniformly distributed on the matrix phase in the composite coating. The microstructure characteristic of the composite coating resulted in the microhardness rising to about 1000 HV0.3 (China GB/T 4342-1991) and the wear resistance significantly increased relative to the substrate. In addition, the fine and homogeneous solidification microstructure without graphite phase in the transition zone led to a good metallurgical bonding and transition between the coating and the substrate. It was of great significance for the cast iron to modify the surface and repair surface defects or surface damage. View Full-Text
Keywords: laser cladding; microstructure; wear resistance; composite coating; cast iron laser cladding; microstructure; wear resistance; composite coating; cast iron
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Liu, Y.; Qu, W.; Su, Y. TiC Reinforcement Composite Coating Produced Using Graphite of the Cast Iron by Laser Cladding. Materials 2016, 9, 815.

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