Effect of CeO₂ Content on Microstructure and Properties of Laser Cladding Ni Matrix-TiC Composite Coatings AITranslate

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Chinese Library Classification Number:TG174.44[金属学及工艺]

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To improve the wear and corrosion resistance of 45 steel(a commonly used material for ship shaft parts)and increase its service life in harsh environments,Ni matrix-TiC composite coatings with dif-ferent CeO₂ contents were successfully prepared on 45 steel substrate using laser cladding technology.The effects of CeO₂ content on the microstructure and properties of the coatings were investigated by SEM,EDS,XRD,microhardness tester,tribometer,and electrochemical workstation.The results show that the rare earth-free coating primarily consists ofγ-(Fe,Ni)solid solution and carbides such as TiC,Fe₃C and Cr₇C₃,whereas the addition of CeO₂ leads to the formation of new phases,including CeNiSi₂ and Ce₂Ni₂₂C₃.The addition of an appropriate amount of CeO₂ contributes to grain refinement and microstruc-ture homogenization of the coating,thereby enhancing its microhardness and wear resistance,while simul-taneously reducing corrosion susceptibility,resulting in superior corrosion resistance of the coating in 3.5% NaCl solution.However,adding excessive CeO₂ induces decomposition of carbides in the coating,resulting in a decrease in its microhardness and wear resistance.Furthermore,the formation of Ce-Ti-O inclusions promotes pitting initiation in the coating,ultimately degrading its corrosion resistance.This study provides a theoretical foundation for rare earth modification of composite coatings for critical ship parts under harsh marine conditions.