Abstract
By optimising the particle size of cladding alloy powders, in situ micron and submicron (Ti-V)C reinforced Fe-based laser cladding layers were prepared and the dry sliding friction properties were comparatively studied. Results showed that there were same phases of α-Fe, γ, TiC, and TiVC2 in the two cladding layers. The average grain size of the Fe-based matrix was 3.46 μm and 3.37 μm, the microhardness was 731 HV0.2 and 736 HV0.2, and the area ratio of carbides was 11.14% and 11.02%, respectively. The dry sliding wear resistance of the cladding layer reinforced by 1.95 μm carbides was 2.76 times higher than that of the 0.49 μm carbides. The failure mechanism of the cladding layer with the micron carbides was mainly caused by plastic deformation of the cladding layer matrix, whereas that of the submicron carbides involved both the plastic deformation of the cladding layer matrix and the abrasion that was caused by the peeled carbides.
Highlights
IntroductionConsidering performance-price ratio of the cladding materials, Fe-based alloy powders show good application prospects owing to their low cost and high wear resistance [5,6]
In the field of surface engineering, laser cladding technology can prepare a cladding layer with a low dilution rate, small stress and deformation, and metallurgical combination with the substrate [1,2,3,4].Considering performance-price ratio of the cladding materials, Fe-based alloy powders show good application prospects owing to their low cost and high wear resistance [5,6]
Van Acker et al [15] confirmed that a decrease of the WC particle size could improve the wear resistance of the WC/Ni cladding layer when the WC content was 10%, and it was clear that the wear resistance increased with the overall hardness
Summary
Considering performance-price ratio of the cladding materials, Fe-based alloy powders show good application prospects owing to their low cost and high wear resistance [5,6]. Reducing carbides size is beneficial to improve the corrosion resistance of cladding layers, but the variation of their wear resistance is worthy of research. Only a few studies have focused on the effects of the particle size on the wear resistance of carbide-reinforced metal matrix composite materials. Van Acker et al [15] confirmed that a decrease of the WC particle size could improve the wear resistance of the WC/Ni cladding layer when the WC content was 10%, and it was clear that the wear resistance increased with the overall hardness. Duan et al [17]
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