Abstract
The grain bpundary (GB) self-diffusion of chromium and iron in polycrystalline austenitic NiFeCr alloys has been studied from 858 to 1208 K using the sectioning method. It appears that the dependence of the GB diffusivity on the average nickel concentration is not so strong as the dependence on the chromium concentration. It is shown that, unlike the volume diffusion coefficients, the GB diffusivities of chromium were lower or equal to those of iron. With respect to their dependence on the chromium content of the alloy, the iron and chromium GB diffusivities reach a maximum and a minimum respectively at 10 wt.% Cr. The Arrhenius parameters for iron and chromium GB self-diffusion tend to increase with increasing chromium content, reaching constant values at about 20 wt.% Cr. The activation energy for chromium GB diffusion for all the chromium isoconcentration sections was always higher than that for iron GB diffusion.
Published Version
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