EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

Interstitial diffusion occurs in a variety of applications as gaseous nitriding (diffusion of nitrogen atoms), oxidation of metals (diffusion of oxygen atoms), or structural embrittlement due to hydrogen (diffusion of hydrogen atoms). Today, the effect of stresses (whether applied or residual) is important studies in several research applications to improve the mechanical characteristics of materials or reduce processing time. The problem of diffusion is, by the nature of the process, dealt with by the thermodynamics of irreversible processes (T.P.I). The objective here is to provide elements of understanding on the couplings between interstitial diffusion and i) homogeneous applied stress, ii) an applied stress gradient, or iii) residual stresses are previously undergone by the material. The proposed approach will be based on the use of the FreeFEM++ calculation code.