Abstract
The diffusivity of carbon at 1,273 K in solid solutions of Ni, Co, and Fe was determined by measuring the initial graphite precipitation temperature on the interface between regions of low and high carbon content during cooling. The results show that diffusivity is independent of carbon concentration for the range of concentrations investigated. When two samples of the same metal with different carbon concentrations are brought into contact and held isothermally, diffusion of carbon occurs across the contact interface between the samples from the alloy with the higher carbon content to the alloy with the lower carbon content. The resulting carbon concentration profile in the area of the interface is a function of the initial carbon concentrations, C[sub 1] and C[sub 2], the annealing temperature T, and the annealing time t. The present study includes the experiment determination of the carbon concentration profile and the calculation of carbon diffusivity.
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