|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Refractory Metals 2016
||Influences of Rare Earth on Microstructures and Mechanical Properties of Functionally Graded Cemented Carbides
||Xiaofeng Li, Yong Liu
|On-Site Speaker (Planned)
Functionally graded cemented carbides (FGCCs) were prepared by pre-sintering and carburizing of carbon-deficient WC-Co cemented carbides. TEM analyses indicated that Y is mainly distributed in Co phase, and another part of Y is separated in the interface of Co phase. Y distributed in Co phase has a strong effect on suppressing the grain growth of WC grains. Y separated in the interface can react with impurity elements, and purify grain boundary, and then reduce defect of FGCCs. The thickness of the gradient layer in the 0.5% Y2O3-added FGCCs is almost doubled compared with that in the Y2O3-free FGCCs because of the refinement of microstructures and the increased diffusion channels for carbon through the Co phase. The FGCCs with the addition of Y2O3 exhibit a much higher transverse rupture strength due to thicker gradient layer, finer microstructures and solution strengthening of Y in Co phase.
||Planned: A print-only volume