Iron-based Self-grinding Coating and Its Properties Prepared by High-speed Laser Cladding
To enhance the wear resistance of iron-based self-sharpening blades and improve the service life of agricultural machinery components,fiber-optic coaxial powder-fed laser cladding technology was employed on the surface of self-sharpening blade molds(65 Mn).By adjusting the cladding scanning speed,a systematic analysis of the wear resistance and hardness of Fe901 hard alloy coatings was conducted.Techniques such as XRD,SEM-EDS,and friction and wear testing were used to analyze the cross-sectional morphology,phase composition,hardness,and wear resistance of the cladding coatings.The results showed that the microstructure of the Fe901 iron-based hard alloy coating consisted primarily of austenitic columnar and equiaxed dendrites,with needle-like(Cr,Fe)7C3 carbide precipitates observed around the matrix.The main phases of the coating included α-Fe solid solution,(Cr,Fe)7C3 mixed carbides,and CrFeB hard phases.At high scanning speeds of 3m/min and 4.2 m/min,the average hardness of the coating was 767.80 HV0.3 and 829.97 HV0.3,respectively,which were 2.79 and 3.02 times of the hardness of 65 Mn spring steel substrate(275.2 HV0.3).Moreover,the wear volume per unit area of the coating was reduced by 27.39％and 32.78％compared with that of the uncoated substrate,significantly enhancing wear resistance.The research not only effectively improved the hardness and wear resistance of the Fe901 iron-based hard alloy coating but also demonstrated significant potential for enhancing the performance of iron-based self-sharpening blades.
self-sharpening coatinghigh-speed laser claddingFe901 tungsten carbide powderhardnesswear and corrosion
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