The effect of silicon and germanium additives on the structure and properties of cast cobalt tungsten-molybdenum high-speed steel of type R6M5K5 is studied. Results of metallographic and x-ray diffraction analyses of experimental steels after casting, annealing, quenching, and tempering are discussed. The interrelation of the structural parameters, the degree of contamination of the metal with nonmetallic inclusions, and mechanical parameters is determined with respect to the amount of additives of both elements.
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