Abstract
The nitrogenation of iron in N 2 and the carburization of iron in CH 4H 2 mixtures were studied in a flow apparatus by a resistance method in the presence of adsorbed sulfur. From these measurements the adsorption isotherm for sulfur on iron was obtained at 850°C and the change of the surface energy in dependence on the sulfur activity could be calculated. These results and measurements of the growth of grain boundary grooves were used to determine the influence of adsorbed sulfur on the surface self-diffusion of iron, which is enhanced by a factor of 3 to 5 in the presence of a saturated layer of adsorbed sulfur.
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