Production of carbide steels based on high-speed steel by induction surfacing

The work is devoted to the study of the possibility of obtaining carbide steel based on powdered high-speed steel 10R6M5 with additives of tungsten (WC) and titanium (TiC) carbides by induction surfacing. The selected compositions of the deposited charge and the proposed composition of the flux based on fused borax with additives of boric acid and a number of oxides satisfy the technology. The developed technology includes a flux, a method of briquetting charge using a piston device that minimizes the movement of ferromagnetic components of the charge under the influence of inductor electromagnetic field during surfacing. Deposited layers of carbide steel based on high-speed steel reinforced with tungsten and titanium carbides were produced and studied. The obtained layers were analyzed using optical and electron microscopy (using a microanalyzer), phase composition of the deposited layers was controlled by the X -ray phase method, and hardness of the layers was measured by the Rockwell method. Addition of tungsten carbide to powdered high-speed steel leads to the formation of ledeburite structure during surfacing, which is characteristic of high-tungsten high-speed steels. An increase in the amount of tungsten carbide in the carbide steel leads only to its partial melting in liquid steel, which helps to preserve the particles of introduced carbides in the microstructure. Titanium carbide added to the carbide steel composition significantly changes the morphology of ledeburite precipitates. According to X -ray phase analysis data, a number of carbides of Me 12 C, Me 6 C, Me 2 C and Me C types were observed in the composition of carbide steels, which are characteristic of carbide steels obtained by various methods (plasma surfacing, sintering, impregnation of a carbide frame, etc.). It is shown that hardness of the samples of carbide steels with additives of tungsten and titanium carbides varies from 59 to 63 HRC, depending on the composition and technological modes of surfacing.