Microstructure and mechanical behavior of functionally graded cemented carbides with CoNiFeCr multi-principal-element alloy binder
Source abstract
Abstract
In this work, functionally graded cemented carbides (FGCCs) with CoNiFeCr multi-principal-element alloy (MPEA) binder were prepared by pre-sintering and carburizing . The microstructure and mechanical behavior of WC-CoNiFeCr FGCCs with different carbon contents obtained at different carburization temperatures were studied. The results showed that a higher carbon content simultaneously accelerated the diffusion rate of carbon and increased the diffusion channel of carbon. The FGCC with a carbon content of 4.55% obtained at a carburizing temperature of 1450 °C exhibited the thickest gradient layer and the highest extreme hardness difference, TRS, and fracture toughness. Moreover, as the thickness of the gradient layer increased, the fatigue sensitivity of FGCCs enhanced, approaching the characteristics of metallic materials.
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