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Preparation, Microstructure and Wet Wear Properties of Fe55 Based Welding Layer with Co-addition of 0.01wt% CeO2 And 1.5 wt% SiC Particles by Plasma Beam Spraying Method
Summary
Researchers investigated the effects of co-adding CeO2 (0.01 wt%) and SiC (1.5 wt%) particles to Fe55-based plasma beam sprayed coatings on 1025 steel, characterizing microstructure and wet wear properties using optical microscopy, SEM, EDS, and rubber wheel friction testing, finding modified dendrite growth patterns and altered diffusion coefficients for Cr and C.
The effects of co-addition CeO2 and SiC particles on the morphology, surface cracks, microstructure, precipitated phases and wear property of plasma beam spraying Fe55-based coatings on 1025 steel were investigated by optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive X-ray spectrometer (EDS), ultra-deep field microscope and wet sand rubber wheel friction tester, respectively. The results showed that the dendrite exhibited a directional growth pattern perpendicular to the substrate and the transitional states of microstructure with the co-addition CeO2 and SiC particles. With addition of CeO2 or SiC affected the flowability of molten steel at macro level, leading to a reduction in the liquid phase diffusion coefficient DL of Cr and C and resulted in a decrease in the G/R ratio. The dendrites changed into equiaxed grains. The main phase composition of Fe55 welding layer is Cr7C3, γ-Fe. The grain boundaries consisted mainly of a reticular eutectic structure. The worn-out uniformly surface of the Fe55+1.5 wt% SiC+0.01wt% CeO2 with Ra was 0.28 μm was smoother than that of other samples. The sub-wear mechanisms during the friction process were microploughing and microcutting. The hardness and toughness of Fe55+1.5 wt% SiC+0.01wt% CeO2 were well-matched, avoiding excessive microcutting and microplastic deformation.
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