Effect of Y2O3 on the Microstructures and Properties of Magnetic Field-Assisted Laser-Clad Co-Based Alloys

To improve the performance of laser cladding coatings, magnetic field-assisted laser cladding technology was combined with rare earth oxide Y2O3 to form composite laser cladding coatings on 300 M steel. The results of the experiment reveal that the magnetic field and Y2O3 had a magnetostrictive effect on the cladding coatings, and it had a significant impact on the lattice parameters. In the magnetic field, Y2O3 is beneficial to improve the uniformity of the element distribution and refine the grains, thereby improving the mechanical properties of the coatings. The effects of Y2O3 and the magnetic field on the wear and corrosion resistance of the cladding coatings were investigated through dry friction and electrochemical corrosion tests. The results revealed that the cladding coatings with a magnetic field and 3 wt.% Y2O3 had the best wear and corrosion resistance. The combined effect of the magnetic field and Y2O3 has a positive effect on the prevention of cracks and enhances the performance of the laser cladding coatings.