Kinetics of heterogeneous dislocation precipitation of NbC in alpha-iron

Atomistic Kinetic Monte Carlo studies of microchemical evolutions driven by diffusion processes under irradiation

“…Over the last few years, many AKMC studies have been devoted to the modelling of thermal ageing in binary, ternary and even multicomponent alloys, and to the effects of the vacancy diffusion mechanisms . A few simulations also take into account the diffusion of small elements by a direct interstitial mechanism (such as carbon in steels [27][28][29]). …”

Kinetics of niobium carbide reinforced composite coating produced in situ

“…During the subsequent heat treatment process, NbC was formed by the graphite phase, which provides C atoms that reacted with the Nb atoms supplied by the Nb plate. Slower diffusion of Nb atoms by vacancy jumps occurred from the Nb plate to the substrate surface, and rapid diffusion of C atoms by interstitial jumps occurred at the substrate surface [19]. After Nb atoms in the substrate subsurface achieved an equilibrium concentration, NbC began to nucleate at dislocation or grain boundaries on the substrate surface [15,19,20].…”

Effect of Lanthanum on the Precipitation of NbC in Ferritic Steels

“…The previous studies [17][18][19][20] suggest that the heterogeneous nucleation plays a prominent role in carbide particles precipitation kinetics in the ferrite matrix, and the precipitation tends to occur on dislocations instead of in a homogeneous manner. The present precipitation model is based on the model by F. Perrard et al 21) The following assumptions are in this model: i) the precipitation is purely diffusion controlled, ii) precipitate particles are stoichiometric and spherical.…”