## 5 Discussion  
The comparison of the numerical approaches revealed that both the software packages provide reliable results in spite of using different computational models. The observed differences between the results can primarily be attributed to the fact that the Forge NxT model calculates in 3D space, whereas the ANSYS-Maxwell model works in 2D space. Furthermore, both the models featured simplifications to maintain a reasonable computational time. Nevertheless, the investigated electromagnetic parameters were comparable in both the models, which verified their applicability. Forge NxT was further used to perform three simulations of induction heating of WNiCo workpieces to the target deformation temperatures of 700, 900, and 1100 C. Together with the simulations, experimental induction heating and subsequent swaging of WNiCo workpieces at the selected temperatures was performed. Experimental swaging at 900 C turned out to be the most favorable solution, since the workpiece pre-heated to 700 C exhibited brittle cracking during swaging, and the workpiece pre-heated to 1100 C exhibited evident surface oxidation. Furthermore, an experimental measurement of temperatures in the axial and surface regions of the WNiCo workpiece pre-heated to 900 C exhibited satisfactory correlations with the predicted results; the final temperatures in both the regions correlated despite the fact that their developments in prediction and experiment slightly differed. As evident from the microstructure observations of the piece swaged at 900 C (Figure 9b,c), both its axial and subsurface regions featured deformed tungsten agglomerates (compared to the equiaxed agglomerates within the sintered microstructure, Figure 6b), which points to the sufficient heating of the bulk of the workpiece before processing. The inter-agglomerate spacing was shorter in the subsurface workpiece region due to the direct effect of the swaging dies. The shear strain incrementally imposed upon the workpiece by the rotating swaging dies is the most intense in the workpiece subsurface region [53; 54; 55]. This phenomenon also affected the subsurface microstructure of the workpiece swaged at 1100 C, however with a higher intensity due to the decreased flow stress of the matrix at the elevated temperature [56]. As depicted in Figure 9d, this region featured shear bands and microstructure inhomogeneity, which could introduce residual stress and cause a possible decrease in the lifetime of the final product (these phenomena are planned to be investigated in greater detail in a following study). A previously published study dealt with experimental and numerical investigations of the deformation behavior of a WNiCo workpiece pre-heated in an electric furnace during warm rotary swaging [18]. The reported results revealed the absolute effective strain after swaging to be the highest in the workpiece subsurface region, and its intensity then decreased towards the axial region. Furthermore, the initial temperature in the subsurface region was slightly higher than in the axial region, by the effect of which the flow stress of the NiCo matrix decreased and thus enabled higher deformation to proceed in the subsurface region (especially at higher temperatures). The comparison of the herein presented results of the microstructure analyses of the induction heated swaged piece with the previously published results of the analyses of the swaged piece pre-heated in a furnace thus exhibits a satisfactory correlation. This fact documents that the induction heating did not negatively affect the microstructure of the swaged billet despite the very short heating time. In other words, the substantially reduced heating time, i.e., intensified heating process, did not induce undesirable development of cracks or voids during the subsequent swaging (for optimized heating process).