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.
Highlights
With the wide application of grey cast iron, longer useful life and better performance, such as thermal fatigue resistance, wear resistance, and corrosion resistance, were expected [1,2,3]
Their results indicated that the wear resistance of laser cladding WC samples was superior to that of laser remelting ones and their wear resistance was enhanced with the increase of WC content
It is clear that the diffraction peaks of graphite phase disappeared and the diffraction peaks of TiC phase appeared after laser cladding
Summary
With the wide application of grey cast iron, longer useful life and better performance, such as thermal fatigue resistance, wear resistance, and corrosion resistance, were expected [1,2,3]. Yang et al [7] investigated the nanomechanical properties and thermal fatigue resistance of grey cast iron processed by laser alloying. They found that the nanohardness of the alloying zone was improved pronouncedly by generating a homogeneous microstructure which has upgraded chemical composition and refined grains. Pang et al [8] produced striature bionic coupling units by laser surface remelting to improve the wear resistance of grey cast iron guide rails. Jing et al [9] studied the wear resistance of graphite cast iron brake discs with bionic units processed by laser cladding WC (tungsten carbide) and laser remelting.
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