A new numerical model for cemented carbides with cobalt gradient has been developed. In this study, carburization is used to form cobalt gradient structure with optimized surface characteristics. Finite-element formulations incorporating continuous and smooth spatial variation in the composition and properties of the cemented carbides are used to simulate the evolution of elastoplastic response of functionally graded cemented carbides (FGCC) due to thermal loading. The geometry of specimens is axisymmetric solid cylinder with two-dimension gradient. The constitutive elastoplastic response is developed by constraint factors. The plasticity constraint factor is used to determine the stress-strain relation of plastic deformation. Different shapes of cobalt rich zone are considered to analyze the evolution of thermal stresses. The calculated results show arc transition of gradient in the corner has a good agreement with XRD measurement.
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