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Tungsten, molybdenum and cobalt were co-diffused into the surface of ingot, 20 steel, 45 steel and T8 steel by a double glow plasma surface alloying technique. Surface alloyed layers formed on ingot and 20 steel are composed of -Fe +(Fe,Co)7(W,Mo)6, which possess the same strong age-hardening ability as the metallurgical age-hardened high speed steel, the maximum hardness can reach 1100 HV0.o25 after ageing treatment. Surface alloyed layers formed on 45 steel and T8 steel are composed of M6C, hardness of which are over 1100-1400 HV0.o25- Alloyed layers formed on ingot and 20 steel possess good toughness. Alloyed layer of carbide type exhibits slightly brittleness.
Tungsten, molybdenum and cobalt were co-diffused into the surface of ingot, 20 steel, 45 steel and T8 steel by a double glow plasma surface alloying technique. Surface alloyed layers formed on ingot and 20 steel are composed of -Fe + (Fe, Co) 7 (W, Mo) 6, which possess the same strong age-hardening ability as the metallurgical age-hardened high speed steel, the maximum hardness can reach 1100 HV0.o25 after aging treatment. T8 steel are composed of M6C, hardness of which are over 1100-1400 HV0.o25-Alloyed layers formed on ingot and 20 steel with good toughness. Alloyed layer of carbide type exhibits slightly brittleness.