Computer simulation of nitrided layers growth for pure iron

This paper presents results of simulations of diffusional process of nitrogen on pure iron, it makes emphasis on choice of the nitriding potential of NH3–H2 atmosphere on microstructural constitution and growth kinetics of nitrided layers. On the basis of latest investigations about experimental results from nitrogen absorption-isotherms theory, we have showed that is possible to predict both microstructural nature and thicknesses of nitrided layers as well as the nitrogen profile within the formed phases during gas nitriding. Diffusion model based on Fick’s laws was applied to pure iron in order to study the growth kinetics of layers, and we have compared the results from analytical model and the results from nitrogen absorption-isotherms data with the experimental ones.