By S. I. Bashkirov
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6. Relationship between the wear of VK11 hard metal tools during drilling and hardness (Kreimer, Safonova and Bogino). HO 120 (30 oersted FIG. 7. Relationship between the durability of VK 11 hard metal bits during drilling and coercive force (Kreimer, Safonova, and Bogino). e. grain size), we produced a curve with a maximum for VK11 metal (Fig. 7); a similar curve was also produced for VK8 metal. It was also successfully established that maximum service strength does not coincide with maximum bending strength.
By varying the reduction temperature of tungstic oxide or by varying the grinding conditions. However, we included this question in the investigation. The relationship between bending and service strength and the cobalt content is shown in Figs. 8, 9 and 10 for three types of hard metal produced from tungsten which had been reduced at 1200°, 720°-820° and 650°-820°C respectively. As was to be expected, all the mechanical properties increased with the increasing cobalt content up to 20 per cent.
Relationship between strength and coercive force for VK11 metals produced from tungsten powders reduced by hydrogen at various temperatures (1200°, 920°, 720°-820° and 650°-820°C), with ordinary and intensive grinding of the mixtures (Kreimer, Safonova and Bogino) : durability when drilling ; # ordinary grinding ; maximum bending strength; ο intensive grinding; — # — # — # — impact toughness. (1) intensive grinding for hard metals for drilling is not advisable since their toughness in service is either fixed or else decreases ; here, as already explained, wear is hardly reduced; (2) the necessary toughness in service is achieved for tungsten hard metals produced at 1200 °C with 8 per cent Co, for tungsten hard metals produced at 920°C with 11 percent Co, for tungsten hard metals produced at 720°-820° and 650°-820° with 20 per cent Co.