Effect of Y₂O₃on Microstructure and Properties of WC/Ni60 Gradient Composite Coatings AITranslate

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Chinese Library Classification Number:TG146[金属学及工艺—金属材料]

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Ni60/WC composite coatings with different Y₂O₃contents were prepared on the surface of H13 steel by laser cladding in-situ generation method,and the macrostructure,microstructure,and microhardness of the coatings were analyzed to find the optimal Y₂O₃addition.And the phase composition,microstructure,microhardness,and wear mechanism of the WC/Ni60 gradient composite coatings with the optimal Y₂O₃addition were also investigated.The results show that the microhardness of the composite coatings presents a trend of increasing at first and then decreasing with the increase of Y₂O₃content.When the Y₂O₃content is 1.5%,the macroscopic quality of the coatings reaches the best with refined grains and the largest microhardness.And when the Y₂O₃content continues to increase,the WC particles in the coatings become larger again while the microhardness decreases.Compared with gradient composite coatings without the addition of rare earth,the thickness of the gradient composite coatings doped with rare earth is reduced,and the morphology and distribution of the microstructure undergo some changes.And the internal enhancement phase particles become finer and more uniform with the angles being blunted,and the microhardness of each layer from top to bottom increases by 49.2 HV_0.5,75.78 HV_0.5,and 72.78 HV_0.5,respectively.The wear loss receives a decrease for different time,and the wear mechanism still consists of adhesive wear,brittle spalling,and abrasive wear.