Conclusions
The degree of dispersion and size distribution of the excess carbides depend significantly upon the composition of P/M high-speed steels. Refinement of the carbides reduces fracture toughness and with broadening of their size distribution curve the strength drops. Carbon supersaturation is an economical and effective method of dispersion of the structure of the investigated alloys and increase of the quantity of carbide phases for the purpose of improving wear resistance. The maximum effect is obtained in selection of a steel composition in which after hardening the only excess carbides are MC carbides.
In the opinion of the authors the mechanism of influence of AC on structure is related to high cooling rates (103–105 deg/sec) of the powder in spraying and the position of the high-speed steel on the phase diagram relative to the eutectic composition.
An increase in AC has both a positive and a negative influence on the properties of P/M high-speed steels and the optimum supersaturations must be selected taking into consideration the required level of hardness, strength, and toughness in relation to the specific service conditions.
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Translated from Poroshkovaya Metallurgiya, No. 10 (346), pp. 64–69, October, 1991.
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Skrynchenko, Y.M., Sokol'chuk, K.Y. Influence of the ratio between carbon and carbon-forming elements on the structure and mechanical properties of P/M high-speed steels. Powder Metall Met Ceram 30, 865–869 (1991). https://doi.org/10.1007/BF00795859
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DOI: https://doi.org/10.1007/BF00795859