Abstract
The phenomenon of carbon separation on the surface of a supersaturated solid solution of carbon in Ni, Co, and austenite in the course of vacuum cooling is used. Dependences of the rate of formation of centers of graphitization on the supercooling of a solid solution are constructed by high-temperature vacuum metallography. A technique is developed, for determining supercooling in microscopic surface sections. The kinetics of surface graphitization is described by the equation $$J_s = Ae^{ - \frac{u}{{kT}}} e^{ - \frac{{B\sigma ^3 }}{{T\Delta T^2 }}} $$ . Solid solution-graphite interphase energy is estimated from the slope of the In Js-1/T ΔT2 lines. Its value for these alloys are as follows: 20–30 ergs/cm2 for Ni-C, 25–35 ergs/cm2 for Co-C, and 25–50 ergs/cm2 for Fe-C alloys.
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