Optimizing Induction Heating of WNiCo Billets Processed via Intensive Plastic Deformation

Abstract

The aim of the work is to optimize the induction heating regime and propose a suitable deformation temperature for a pre-sintered powder-based tungsten heavy alloy workpiece subsequently processed via rotary swaging. The heating regime is designed with the help of numerical analyses and subsequent experiments. The first part of the study focuses on the theoretic background of the induction heating and comprises the development of a reliable induction heating model via performing electromagnetic simulations in two individual computational software packages (for verification). The second part of the study then involves the optimization of the heating regime using the designed numerical model. Last but not least, the predicted results are compared to the experimentally acquired results, and the optimized heating regime, applicable before experimental rotary swaging of the WNiCo workpiece, is proposed. The results of the microstructure analyses of the workpiece heated to the selected optimum deformation temperature of 900 °C showed that the designed induction heating procedure provided sufficient heating of the bulk of the workpiece (contrary to the lower swaging temperature), as the swaged microstructure featured well-deformed tungsten agglomerates. Furthermore, the analyses documented the high-quality oxidation-free surface of the particular workpiece (contrary to the higher swaging temperature).

Effects of Temperature (In)homogeneity during Hot Stamping on Deformation Behavior, Structure, and Properties of Brass Valves

“…[ 30 ] The applied method of heating, i.e., induction, is quite convenient especially for regime A, as induction heating is rapid and generally imparts temperature gradients between the axial and (sub)surface regions of heated semi‐products. [ 31 ] Nevertheless, in case the (sub)surface temperature of the semi‐product is too low compared to its axial temperature, significant differences in plastic flow are expected to occur. Such material behavior can result in the generation of undesired stress peaks, as well as nucleation of defects (folds, cracks, etc.).…”

Correlation of structure development and electric characteristics within high pressure torsion processed copper

“…[3][4][5][6][7][8]. iii) to use optimized thermomechanical (deformation) treatment (e. g. via rotary swaging, or methods of severe plastic deformation) [9][10][11][12]. The mentioned methods of plastic deformation can favorably strengthen the processed materials as they impart the generation of dislocations, which subsequently form dislocation cells and walls and consequently subgrains (typically defined with low angle grain boundaries), which finally develop into individual grains (typically defined with high angle grain boundaries) [13].…”

Influence of Imposed Strain on Weldability of Dievar Alloy

“…The continuous development of new materials in various industries is primarily driven by the ever-increasing demand. This trend is evident not only from the design of specialized processing methods, such as thermomechanical processing (TMP) of well-known metallic materials [1][2][3][4], but also from the development of new preparation processes, such as additive manufacturing [5][6][7]. Combinations of additive manufacturing and TMP have also been proposed, and their effects studied [8][9][10].…”