A new model was developed to calculate the diffraction elastic constants (DECs), and of a
C-Co cemented carbide. In this model, the polycrystal is treated as an agglomerate of randomly orientated anisotropic grains, which are assumed to be spherical and embedded within a homogenous effective medium which is determined as the average of all grains. The accuracy of the predicted value is confirmed by in situ X-ray diffraction method under uniaxial loading. The model predictions fit well with the test results, since the largest deviations between the measured and calculated values for and for the Co phase are less than 3.6% and 13.1%, respectively. The good agreement shows the reliable predictability of the model.
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and 
of a 
C-Co cemented carbide. In this model, the polycrystal is treated as an agglomerate of randomly orientated anisotropic grains, which are assumed to be spherical and embedded within a homogenous effective medium which is determined as the average of all grains. The accuracy of the predicted value is confirmed by in situ X-ray diffraction method under uniaxial loading. The model predictions fit well with the test results, since the largest deviations between the measured and calculated values for 
and 
for the Co phase are less than 3.6% and 13.1%, respectively. The good agreement shows the reliable predictability of the model.