Microstructure, Tribological Performance, and Wear Mechanism of Cr- and Mo-Reinforced FeSiB Coatings by Laser Cladding
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JMEPEG https://doi.org/10.1007/s11665-020-05187-w
Microstructure, Tribological Performance, and Wear Mechanism of Cr- and Mo-Reinforced FeSiB Coatings by Laser Cladding Jiali Zhou and Dejun Kong (Submitted July 11, 2020; in revised form August 7, 2020; Accepted September 9, 2020) FeSiB coatings with the additions of Cr and Mo were fabricated on S355 steel using a laser cladding. The surface and cross section morphologies, chemical elementals, phases and valences of obtained coatings were analyzed using a scanning electron microscope, energy-dispersive spectroscope, x-ray diffraction, and x-ray photoelectron spectroscopy, respectively. The corrosive-wear properties of Cr- and Mo-reinforced FeSiB coatings in 3.5% NaCl solution were analyzed using a ball-on-disk wear tester. The results show that the grain shapes of FeSiB, FeSiBCr and FeSiBCrMo coatings are sequentially transformed from the rodshaped and dendritic grains to the equiaxed grains, the additions of Cr and Mo play the roles of refinement and dispersion strengthening. The average coefficients of friction of FeSiB, FeSiBCr and FeSiBCrMo coatings are 0.68, 0.47, and 0.65, respectively, and the corresponding wear rates are 82.8 3 1026, 57.5 3 1026, and 79.9 3 1026 lm3ÆN21Æm21, respectively, showing that the corrosive-wear resistance of FeSiBCr coating is the best among the three kinds of coatings, the phase distribution is the main factor of affecting the wear resistance. Keywords
coefficient of friction (COF), FeSiB coating, laser cladding (LC), rare element, wear mechanism, wear rate
1. Introduction With the vigorous development of marine resources, S355 structural steel on offshore platforms is corroded and worn in sea water (Ref 1), corrosion and wear resistance have become one research hotspot in the field of marine engineering (Ref 2, 3). To enhance its corrosive-wear resistant performance, the traditional spraying technology is easily cracked in complex marine environments, which shorts its service life and produces environmental pollution (Ref 4). Compared with the surface coating technologies such as electrodeposition (Ref 5), plasma spraying (Ref 6), and high velocity oxy fuel (HVOF) spraying (Ref 7), laser cladding (LC) has the advantages of low dilution rate, high efficiency and fast cooling speed (Ref 8), which is widely used as the corrosion and wear resistance coatings (Ref 9, 10). The corrosion resistance of Fe-based coatings is weaker than that of Cr-, Ni-, and Al-based coatings; however, its low cost and high quality are more suitable for large-scale use (Ref 11, 12). The additions of rare elements are benefited to increasing the corrosion and wear resistance of Fe-based coatings, Cao et al. (Ref 13) added the NbC to the Fe-based coatings and found that the dissolved Nb and NbC improved its wear resistance; Lu et al. (Ref 14) claimed that the addition WC effectively reduced the coefficient of friction (COF) of Fe-based coating, and improved its wear resistance; Safizadeh
et al. (Ref 15) investigated the electrochemical corrosion behavior of Fe-Mo
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