Abstract
CrxNiyTi0.05La0.01 (x: y = 1:1, 2:1, 1:2) laser cladded -plasma nitrided composite modified layers were prepared on the surface of N80 steel. The effect of Cr and Ni content on the microstructure, wear resistance and corrosion resistance of the composite modified layer was investigated. The experimental results showed that Cr1Ni1Ti0.05La0.01 and Cr1Ni2Ti0.05La0.01 laser cladded layers are mainly composed of columnar crystals with FCC structure perpendicular to the surface, and Cr2Ni1Ti0.05La0.01 laser cladded layer is composed of equiaxed BCC and FCC crystals. The nitrided layers of the three samples are mainly composed of CrN phase, and the nitrided layer of Cr2Ni1Ti0.05La0.01-cladded sample has the highest content of CrN and the best homogeneity and compactness, but the thickness of its nitrided layer is the smallest and the speed of nitriding is the slowest. Compared with N80 substrate, the hardness of the three cladded layers is improved, which enhances the strength support of the nitrided layer and improves the hardness gradient of cross-section. Among them, the strengthening effect of the Cr2Ni1Ti0.05La0.01-cladded layer is the best. The wear resistance and corrosion resistance of the three composite modified layers are improved compared with the conventional nitrided layer on N80 steel, and the nitrided layer of Cr2Ni1Ti0.05La0.01-cladded sample is the best, and its friction coefficient and wear loss are only about 30% and 35% of the nitrided layer on N80, its corrosion current densities in 3.5% NaCl solution and in 0.5 mol/L H2SO4 solution are reduced about 6 times and 3 orders of magnitude, respectively.
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