Lucas Eric Jacques Degeneve

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A Finite Element Model is developed to represent the mechanical behavior of WC-10 wt.% Co in compression tests. In this research, realistic three-dimensional model is obtained by slicing a sample by Focused Ion Beam and reconstituting it, resulting in two interpenetrated phases. The brittle WC phase is defined as elastic. The Co phase includes plasticity. The post sintering cooling is simulated, followed by a loading-unloading compression cycle. The results are then compared with experimental data obtained by neutron diffraction. The residual thermal stresses in both phases are in good agreement with the data obtained by neutron diffraction, featuring high tensile stress in the Co phase and moderate compressive stress in the WC phase. The elastic strain in the Co phase shows a good agreement in the loading cycle, but presents some differences in the unloading cycle. The plastic model applied to the Co phase is then modified to improve the accuracy of the simulation, showing a final good agreement with the experiment.

ELSEVIER SCI LTD2022

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Relaxation time shift of Cobalt related internal friction peak in WC-Co cemented carbide

Samy Adjam, Lucas Eric Jacques Degeneve, Daniele Mari

Cemented carbides are widely used in the cutting tools industry for their mechanical properties. They are composite materials made of hard tungsten carbide grains jointed together by a ductile cobalt binder. Due to the extreme conditions of use of the tools, understanding the evolution of the microstructure of the two phases is essential. This evolution can be followed by Mechanical Spectroscopy, either as a function of the temperature, or of the frequency. A general overview of the spectrum reveals three mechanical loss peaks. The second peak presents a transition in its Arrhenius plot at 1140 K, when measured in isothermal fre-quency scans. The temperature of this transition corresponds with the Curie temperature of the cobalt in WC-Co. However, temperature scans do not reveal any shift in the Arrhenius plot. This result shows how the presence of a phase transition leads to the measurement of apparent activation energies when a relaxation peak is measured in out-of-equilibrium conditions. (c) 2022 Published by Elsevier B.V. CC_BY_4.0

ELSEVIER SCIENCE SA2022

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