The transformation kinetics from the amorphous to crystalline state in W-Co-C samples with different cobalt contents is investigated by means of differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The results show that cobalt influences the crystallisation process of the amorphous (W-C)-based system. The higher the cobalt content, the lower the crystallisation temperature. The transformation kinetics were analysed from the Kissinger equation. It was found that the crystallisation process occurs by steps and is mainly characterised by the formation of the carbide phase M2C, controlled by diffusion. The activation energy, E, as calculated varies between 1.8 and 4.3 eV, depending on the chemical composition of the sample. With respect to the determination of the temperature vs. time transformation (TTT) diagrams, the results obtained reveal that the sample with higher content of cobalt is that which has a lower incubation time.