Effect of Y₂O₃ on Microstructure and Tribological Properties of Fe‐Based Deposited Layers Reinforced by In Situ‐Generated NbC Particles

For improving the microstructure and tribological properties of the deposited layer, different contents of Y 2 O 3 are added to Fe‐based deposited layers reinforced by NbC particles generated in situ, respectively. The main phases of Fe‐based deposited layers reinforced by in situ‐generated NbC particles with different contents of Y 2 O 3 are revealed by X‐ray diffraction, and the microstructure of the deposited layers is characterized by scanning electron microscopy and energy‐dispersive spectroscopy. The influence mechanisms of Y 2 O 3 content on the wear form and tribological properties of Fe‐based deposited layer reinforced by in situ‐generated NbC particles are analyzed, and the wear mechanism of Fe‐based deposited layers reinforced by in situ‐generated NbC particles with different contents of Y 2 O 3 is revealed. The results show that the addition of Y 2 O 3 promotes the generation of Cr 7 C 3 and inhibits the generation of Cr 23 C 6 . With the increase of Y 2 O 3 content, the size and morphology of in situ‐generated NbC particles in Fe‐based deposited layer change. When the content of Y 2 O 3 is 2 wt%, a large number of fine petal‐shaped NbC particles are precipitated, and tribological properties of the deposited layer are excellent. The research results provide theoretical basis and data support for further application of direct energy deposition.