Abstract
Synopsis : In order to investigate carbon distribution between solid and liquid phases in Fe-C binary system, austenite-liquid phases equilibrated in the temperature range from 1150 to 1 400•Ž were quenched and the carbon concentrations in each phase were determined by EPMA analysis. The results obtained are summarized as follows : (1) Solidus and liquidus obtained coincided well with the curves given in other recent works. (2) Diffusion distance of carbon from liquid-solid interface into solid phase during quenching was calculated. From the results of the calculation, it became clear that carbon concentration in the center of solid phase was not influenced by the carbon diffusion during quenching. (3) Equilibrium distribution coefficient of carbon in Fe-C system was determined thermodynamically. Solidus corresponding to the liquidus obtained experimentally was calculated by using the above coefficient and it was in good agreement with the experimental one.
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