Effects of Y2O3 on Microstructure and Properties of Plasma Surfacing WC/Ni60 Surfacing Layer
The nickel-based composite surfacing layer was prepared on Q235 steel plate by plasma surfacing,and the effects of different contents of Y2O3 on the microstructure and performance of the nickel-based tungsten carbide surfacing layer were studied.The microstructure of the surfacing layer was analyzed by SEM and XRD,and the hardness and wear properties of the surfacing layer were tested by Vickers hardness tester and end-face high temperature friction and wear tester.The results indicate that the addition of Y2O3 makes carbide regularization in the surfacing layer,and it grows around with WC as the core.The main phase in the surfacing layer is γ-Ni(Fe),WC,W2C,M23C6,M6C,Cr7C3 and FeNi3 phases.The microhardness of the surfacing layer added with 1.2%Y2O3 reaches the maximum value of 970 HV0.5,which is 283 HV0.5 higher than that of the surfacing layer without Y2O3.Under high temperature friction and wear conditions,the minimum wear amount is 2.8 mg,and the friction coefficient is about 0.32.At this time,the wear mechanism is slight abrasive wear.
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